Lathem 24A715M manual

Installation Manual Models 24A715, 24A715M Document No. 427-12-00014 (02) Master Time/Program Clock[...]

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NOTICE To ensure the performance of our products and systems, we may occasionally make tech - nological changes and updates. Therefore, the model number suffixes (A, B, C, etc.) listed in the manual or in the drawings may not always match the model you are using. Unless specifically noted, this will not affect the product or its installation, opera[...]

FOR UNITS EQUIPPED WITH AN INTERNAL MODEM (24A715M) NOTICE : This equipment complies with Part 68 of the FCC Rules. On the mounting panel of this equipment is a label that contains, among other information, the FCC Regis - tration Number and Ringer Equivalence Number (REN) for this equipment. If requested, provide this information to your Telephone[...]

SUPPLIER’S DECLARATION OF CONFORMITY Place of Issue: St. Charles, IL Date of Issue: August 17, 2001 Dukane Corporation, located at 2900 Dukane Drive, St. Charles, IL 60174 in the United States of America, hereby certifies that Master Clock model 24A715M bearing labeling identification number US:A95DT06B24A715M complies with the Federal Communica [...]

A NOTE ABOUT THE LITHIUM BATTERY The Lithium Battery (coin cell) contained in this product is NOT user-replaceable. When replaced by an authorized Service Center, used batteries should be disposed of according to the manufacturer’s instructions.[...]

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SECTION 1—INSTALLATION General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 [...]

SECTION 3—FUNCTION LIST Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Quick Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 [*] [...]

APPENDIX B—SECONDARY CLOCK TYPES Secondary Clock Type Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 Wiring Secondary Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2 Type 01—Sync[...]

APPENDIX C—WIRING DIAGRAMS Wiring Diagrams List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 Wiring the Master Clock for 120Vac or 220/240Vac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2 Wiring Signal Devices to the Ma[...]

FIGURES 1-1 Master Clock Wall-Mount Assembly Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1-2 Hook Mounting the Display Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 1-3 L Brackets for Rack Mounting . . . . . . . . . . . . . . . . . .[...]

B-23 Three-Wire Minute Impulse (44th Minute) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-26 B-24 Cincinnati D1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-27 B-25 Dukane Synchronous Wired (24A Series, Obsolete) . . . . .[...]

General Information This installation manual covers the Model 24A715 and 24A715M Master Clocks. Both clocks are installed and programmed in similar fashions. The main difference between the clocks is the 24A715M is equipped with a built-in modem capable of communicating with a PC, or for synchronizing with the NIST Atomic Clock. Both clocks have ei[...]

Optional equipment ( ordered separately from Lathem ): • Connection cable if the po wer supply relay PCB is up to 8 feet (2.4 m) from the display unit • Lathem MasterLink programming software to control the master clock from a PC • Standalone modem • Remote schedule selector switch Mounting the Master Clock The master clock is shipped ready[...]

Surface Mounting To surface mount the master clock: 1. Place the master clock on its back with the display unit facing up and the key pad to the right. 2. Remove the two screws at the top of the display unit mounting plate. 3. Lift the display unit up and away from the backbox. Two rivets at the bottom of the cover will prevent you from lifting it [...]

Semi-Flush Mounting The power supply portion of the master clock can be recessed into the wall, so that the display unit is semi-flush with the wall. This should only be done by a qualified technician. To mount the master clock semi-flush: 1. Place the master clock on its back with the display unit facing up and the key pad to the right. 2. Remove [...]

Using the Installer’s Hooks to Hang the Display Below the Backbox When mounting the clock in either semi-flush or surface installations, the hooks on the back of the display unit mounting plate can be used to hang the display unit below the backbox to allow access for circuit testing and programming. See Figure 1-2 . To use the hooks: 1. Remove t[...]

Rack Mounting The two L-shaped brackets and the box cover supplied with the master clock can be used to install it in a standard 19-inch (48.3 cm) rack. See Figure 1-3 on page 1-7. To rack mount the clock: 1. Place the master clock on its back with the display unit facing up and the key pad to the right. 2. Remove the two screws securing the displa[...]

24A715/24A715M Master Clock Installation Manual 1-7 Rectangular Knock Out L Br acke t L Br acke t Figure 1-3 L Brackets for Rack Mounting[...]

Wiring the Master Clock This section provides instructions on wiring the power source, secondary clocks, and sig - naling devices to the master clock. It does not cover the connection of the optional modem, a computer, any RS-485 devices, and a power source for the optional remove schedule selector. Instructions for those devices are provided in Ap[...]

1. Wire the power source to P4 as shown in either Figure C-1 or C-2 on page C-2. Note: The master clock is shipped set up for 120Vac operation. To wire it for 220/240Vac, change the jumper settings as shown in Figure C-2 . —WARNING— DO NOT turn on AC power, and keep the power/relay unit’s toggle switch OFF until you complete the rest of the w[...]

2. Wire the secondary clocks to P1 and/or to P2. See Wiring Secondary Clocks on page B-2 for complete instructions. Note: You may need to add external metal-oxide varistors (MOVs) or diodes to synchronize a specific clock type. See the clock wiring diagrams in Appendix B . 3. Wire the signaling devices to P3. See Typical Signal Device Wiring on pag[...]

Setting Up the Master Clock Once the master clock is installed, it is ready for programming. This chapter covers the programming instructions needed to set the master clock for operations. Note: To completely clear the clock of all settings and reset the master clock to its factory- shipped configuration, press the following number sequence on the [...]

Programming Functions This section explains how to put the master clock in program mode and configure the necessary functions to get the master clock running. For definitions of all functions, key pad commands, and the bell test, see Section 3—Function List . The master clock is normally in clock mode, displaying the date and time. To access pro [...]

Setting the Date and Time Use the [1]=SET DATE / TIME function to set the date and time. Enter the user password as shown on page 2-2, then follow the key sequences below: Press Display [#] SELECT FUNCTION CODE [1] [1]=SET DATE / TIME [#] ENT. DATE: MM-DD-YYYY [0]...[8] Enter the numbers for the month, date, and year (four-digit year) [#] ENTER DAY[...]

Enabling the Relays Use the [6]=ENABLE CIRCUITS function to enable or disable the master clock’s con - trol relays during circuit wiring or maintenance. This function can also hold back clocks to manually adjust for daylight saving time in the fall if the daylight saving function is not in use (see Setting Daylight Saving Time on page 2-7). The E[...]

Choosing the Clock Types to Synchronize To select a clock type for the master clock to synchronize, use the [2]=SELECT CLOCK CTL function. This allows you to match the master clock to the type of secondary clocks installed. This function configures both clock #1 (relays 7 and 8) and clock #2 (relays 5 and 6), if present. Notes: To check the current[...]

Manually Activating Bell Controls Use the [3]=MANUAL BELL CTRL function to test the bell circuits. This function does not require a password. Follow the key sequences below: Press Display [#] SELECT FUNCTION CODE [3] [3]=MANUAL BELL CTRL [#] MANUAL BELL CONTROLS 1-2-3-4-5-6-7-8 PRESS AND HOLD [#] TO EXECUTE. [*] TO END [1]...[8] Enter the circuit n[...]

Testing the Bells Use the AUTO BELL TEST function to turn on all bell relays once per minute at the start of each minute. This tests the continuity of the bell wiring circuits. This function does not require a password. 1. If you have entered a password within the last several minutes, deactivate it by fol - lowing the instructions under Securing t[...]

Setting Communications The [B]=COMMUNICATIONS function is used to enter data transmission speed and a terminal ID number. Use this function if the clock will be programmed to call the NIST atomic clock, or if you are using the optional Lathem MasterLink software to program the master clock. The clock can be set up using RS-232 (serial), RS-485 (net[...]

Securing the Setup At this point you have finished the basic setup of the master clock and it should be up and running. The clock can now be programmed with user-specific settings such as bell schedules and holidays. For detailed information, see the Master Clock User Guide, doc - ument 427-07-00047. The master clock automatically exits from progra[...]

2-10 24A715/24A715M Master Clock Installation Manual Notes[...]

Introduction This chapter list all functions accessible through the master clock key pad. For detailed instructions on these functions, see Section 2—Configuration and the Master Clock User Guide, document 427-07-00047. Quick Commands Quick commands are used to display system information for about two seconds. You can press the quick keys, [*], [[...]

[1] VIEW EDIT KEYS Any time the master clock is in clock mode (displaying time and date), press [1] to see the edit key designations. See Figure 3-2 and Table 3-2 . The edit keys are used when programming bell schedules, automatic schedule change dates, and holiday dates. Quick command [1] only displays a listing of the edit keys for reference; you[...]

Programming Commands To access the master clock’s programming functions, press [#] to enter program mode. When SELECT FUNCTION CODE appears on the display, the clock is ready for programming. The master clock will automatically exit out of program mode if you have not made a key pad entry for five minutes. [0]=PASSWORD A password is required for [...]

[3]=MANUAL BELL CTRL This function does not require a password. Use this function to test bell circuits or to manually ring a bell at an unscheduled time. See Manually Activating Bell Controls on page 2-6. [4]=PROGRAM SCHEDULE Use this function to set bell schedules. Bell schedules are defined as the days and times when the bell circuits will turn [...]

[7]=DAYLIGHT SAVINGS This function requires the administrative password. Programming the master clock with the appropriate two-digit country code enables it to automatically adjust for daylight sav - ing time. See Appendix A for the country code list, and see Setting Daylight Saving Time on page 2-7. [8]=CHANGE SCHEDULES Use this function to overri[...]

[B]=COMMUNICATIONS This function requires the administrative password. Use this function to set the master clock’s terminal ID# and baud rate. See Setting Communications on page 2-8. [C]=CHANGE PASSWORD Use this function to change the default user password (000000) to another six-digit num - ber to prevent unauthorized access to the master clock?[...]

DAYLIGHT SAVING COUNTRY CODES ALBANIA 02 ENGLAND 01 MALTA 02 ANDORRA 02 ESTONIA 02 MONACO 02 ARMENIA 02 FALKLAND ISLANDS 10 NETHERLANDS 02 AUSTRIA 02 FINLAND 02 NEW ZEALAND 11 AZERBJAN 02 FRANCE 02 NORWAY 02 AZORES 02 GERMANY 02 POLAND 02 BAHAMAS 08 GIBRALTER 02 PORTUGAL 02 BALEARIC ISLANDS 02 GREECE 02 ROMANIA 02 BELARUS 02 GREENLAND 07 RUSSIA 02 [...]

DAYLIGHT SAVING TIME CODES AND DURATION Code Start and end date Code Start and end date 01 Last Sunday in March, 3rd Sunday in October 08 First Sunday in April, last Sunday in October 02 Last Sunday in March, last Sunday in September 09 First day of May, last day of September 03 First day of April, last day of September 10 Second Sunday in Septembe[...]

SECONDARY CLOCK TYPE CODES Type Description Type Description 01 Synchronous Wired 06 Faraday 01 Lathem Type SS 06 Honeywell ST402A 01 Cincinnati D10 07 Dukane 24F200 Digital (Obsolete) 01 Dukane 24SS Series 07 Dukane 24F750, 24F750A (Obsolete) 01 IBM 77 Series 07 Dukane 24D20, 24D20A, 24D40 01 Simplex 77 Series 08 Rauland 2410 Digital 01 Simplex 93[...]

Wiring Secondary Clocks The next several pages contain wiring diagrams and theory of operation for the secondary clocks. These are listed in numerical order according to type code number. Note: All circuits should be fused or protected by a circuit breaker (10A maximum). The 24A715 and 24A715M master clocks are factory-equipped to operate analog cl[...]

Please note that the relay contacts used in the CLK2 circuit are rated at 10 amps. The combined load of the correction circuit and the run circuit should not exceed 8 amps. In general, 20–35 analog clocks can be operated on a single string. This number depends on the clock style and the distances involved. To estimate clock loads for Dukane 24SS [...]

TYPE 02—Three-Wire Minute Impulse (59th Minute) There are two types of Type 02 secondary clocks: the three-wire minute impulse covered on this page, and the two-wire reverse polarity minute impulse on the following page. Note: For a list of Type 02 clocks, see the chart on the first page of this appendix. From the 58th second to 00 seconds each m[...]

TYPE 02—Two-Wire Reverse Polarity Minute Impulse (59th Minute) There are two kinds of Type 02 secondary clocks: the two-wire reverse polarity minute im - pulse covered on this page, and the three-wire minute impulse on the previous page. Note: For a list of Type 02 clocks, see the chart on the first page of this appendix. Every minute, from the 5[...]

TYPE 03—Standard Electric Synchronous During normal operation, 120Vac is applied to the run motor. A 15-minute correction signal on the correction motor line causes a 12-hour correction from 5:12:00 to 5:28:00. This occurs twice daily (AM and PM). Run motor power is connected during the 12-hour correction. A 29-second signal is applied to the cor[...]

TYPE 04—Standard Electric Time AR-2A Two-Wire, Dual Voltage Each minute, from 58 seconds to 00 seconds, a low-voltage pulse (24Vdc) is transmitted. The secondary clocks receive the pulses until the 59th minute. At this time, from 50 sec - onds to 00 seconds, a higher voltage pulse (48Vdc) is required to advance to the hour. Manual clock advances [...]

TYPE 05—Three-Wire Minute Impulse (58th Minute) Each minute, from the 58th second to 00 seconds, a 24Vdc pulse is transmitted to the sec - ondary clocks. From the 58th minute through the 48th minute, the pulse is transmitted on both the A and B lines. From the 49th minute to the 58th minute, the pulse is transmitted on the A line only. Clocks tha[...]

TYPE 06—Synchronous Wired For a list of Type 06 clocks, see the chart on the first page of this appendix. The clock run motor receives 120Vac continuously, with 120Vac furnished to the clock correction coil for 55 seconds each hour from HH:58:05 to HH:59:00 to cause hourly corrections. Ten 120Vac signals are furnished to the clock correction coil[...]

TYPE 07—Dukane Digital Clocks For a list of Type 07 clocks, see the chart on the first page of this appendix. —IMPORTANT— Dukane digital clocks MUST be connected to CLK1 (relays 7 and 8) on the master clock. Also, for the master clock to operate Dukane Digital clocks, its factory-installed relay K7 MUST be replaced with a solid-state relay, p[...]

24A715/24A715M Master Clock Installation Manual B-11 123456 78 CLK1 x x x RELA Y K8 DUKANE SOLID-ST A TE RELA Y (596-303) K7 MASTER CLOCK FIELD CONNECTIONS + – 15Vdc RESET CLK +V –V BLANK DSPL. BRN ORN RED BLK YEL RESET CLK +V –V BLANK DSPL. BRN ORN RED BLK YEL DUKANE DIGIT AL CLOCKS 24F200, 24F750, 24F750A + 1uf BLK (COMMON) RED (+V) ORN ( )[...]

TYPE 08—Rauland 2410 Digital Clocks (24Vac and 120Vac) Rauland 24Vac or 120Vac digital clocks initialize to 12:01 AM when first powered up. During normal operation, the clocks maintain time by counting the 60Hz AC line frequency. When the line voltage drops below 120Vac, the digital clocks start rapidly advancing at two minutes per second. After [...]

24A715/24A715M Master Clock Installation Manual B-13 123456 78 CLK2 x x x x RELA Y K6 (K8) RELA Y K5 (K7) II MASTER CLOCK FIELD CONNECTIONS X = Normall y open contact I = Nor mally closed contact 120V ac 10 ASB MAX. 65–85V ac 1 1 = V250LA4 MOV or equal BLU BRN BLK BLU BRN BLK AC RTN RA ULAND 2410 CLOCK MODULES Figure B-10 Wiring Rauland 2410 Digi[...]

TYPE 09—Simplex 59th Minute, Dual Motor Power is normally applied to the 1 RPM run motor. Each hour, from HH:58:05 through HH:58:59, power is removed from the run motor and applied to the fast advance motor. During manual clock corrections, power is applied to both motors for 4 minutes and 15 seconds. See Figure B-12 . TYPE 10—Simplex 45th Minu[...]

TYPE 11—Edwards Dual Motor Power is applied only through relay K6 to the run motor for normal timekeeping. During power interruptions (while clocks are stopped) and during correction, the master clock accumulates the number of seconds. Immediately after power is restored, both relays K6 and K5 operate. Relay K5 applies power to the 10 RPM motor f[...]

TYPE 12—Cincinnati D6 Clocks Normal pulsing is sent out on lines A and C from second 58 through second 00 each minute. From minute 59 through minute 49, line A is positive with respect to line C. From minute 50 through minute 58, except from 4:49 through 5:55 AM and PM, line C is positive with respect to line A. To provide hourly corrections, 20 [...]

TYPE 13—Two-Wire Pulse Alternating (24Vdc) Every minute from 59 seconds to 00 seconds, a 24Vdc signal is applied on lines A and B, causing the clocks to advance one minute. The polarity of the pulse is alternated each minute to cause A to be positive with respect to B one minute, then B positive with re - spect to A the next minute, and so on. Du[...]

TYPE 14—Electronic Coded Clocks Clocks normally run with 120Vac power. For bells or clock correction, the generator prestart relay (K6) first turns on for the signal generator to reach frequency. K6 turns on at the 00 second after a programmed time or manual bell time. Then relay K5 turns on for three seconds, from the 10th to the 13th second, to[...]

24A715/24A715M Master Clock Installation Manual B-19 123456 78 CLK1 OR CLK2 x x x x RELA Y K6 (K8) RELA Y K5 (K7) II MASTER CLOCK FIELD CONNECTIONS X = Normall y open contact I = Nor mally closed contact AC RT N 10 ASB MAX. 120V ac ST AR T SIGNAL GENERA T OR PREST ART 1 = V250LA4 MO V or equal 1 1 COMMON TO GENERA TOR Figure B-16 Electronic Coded C[...]

TYPE 15—Straight Frequency Clock correction and bell circuit operations are generated by sequentially applying vari - ous frequencies onto the 120Vac. Each bell and clock correction circuit has its own frequency and a receiver circuit that applies the associated bell or clock frequency (3,510Hz normally used for clock signals). The daylight savin[...]

TYPE 16—Three-Wire Minute Impulse (59th Minute) with 12-Hour Correction There are two types of type 16 secondary clocks: the three-wire minute impulse covered on this page, and the two-wire reverse polarity minute impulse on the following page. Each hour from the 59th minute through the 49th minute, a two-second pulse is transmit - ted on both th[...]

TYPE 16—Two-Wire Reverse Polarity Minute Impulse (59th Minute) with 12-Hour Correction There are two types of type 16 secondary clocks: the two-wire reverse polarity minute impulse covered on this page, and the three-wire minute impulse on the previous page. Each hour, from the 59th minute through the 49th minute, a two-second pulse is transmit -[...]

TYPE 17—Standard Electric Time AR-3 Three-Wire Impulse Each minute from 58 seconds to 00 seconds, a pulse is transmitted on line. The secondary clocks receive the pulses on line A until the 58th minute. At this time, from 50 seconds to 00 seconds, a pulse on line B is required to advance to the 59th minute. 24A715/24A715M Master Clock Installatio[...]

TYPE 18—National Synchronous Wired For a list of Type 18 clocks, see the chart on the first page of this appendix. Relay K5 is normally operated to power the clock run motors. Each hour from HH:00:00 to HH:00:28, relay K6 is operated to power the clock correction coils for 28 seconds and cause hourly corrections. Every 12 hours, from 6:00:00 to 6[...]

TYPE 19—Stromberg Synchronous Wired (56th Minute) For a list of Type 19 clocks, see the chart on the first page of this appendix. This clock is normally operated by 120Vac/24Vac. Relay K5 is normally operated to sup - ply motor power. Relay K6 activates each hour from HH:56:10 to HH:56:18, causing an eight-second signal to be transmitted on the c[...]

TYPE 20—Three-Wire Minute Impulse (44th Minute) Every minute, from the 58th second to 00 seconds, a 24Vdc pulse is transmitted to the secondary clocks. From the 44th minute through the 34th minute, the pulse is transmitted on the A and B lines. From the 35th minute to the 44th minute, the pulse is transmitted on the A line only. Clocks that reach[...]

TYPE 21—Cincinnati D1 Every minute, from HH:MM:58 to HH:MM:00, relay K6 is activated, causing an output on line A for two seconds. During minutes 07 through 58 only relay K6 activates, causing the output on line A to be 24Vdc. During minutes 59 through 06, relay K5 is also activated, together with relay K6, causing the output on line A to be 60Vd[...]

TYPE 22—Dukane Synchronous Wired (24A Series, Obsolete) During normal operation, either 24Vac or 120Vac is furnished to the clock run motor through relay K6. Power is removed from the run motor during power failures, while K6 de-energizes during fall daylight saving changes. Each hour from HH:57:00 to HH:57:55, relay K5 energizes to furnish a 24V[...]

TYPE 23—Condor Digital Clocks (Model 2412) For a list of Type 23 clocks, see the chart on the first page of this appendix. Condor digital clocks initialize to 12:00 AM when power is first applied. During normal operations, the clocks maintain time by counting the 60Hz AC line frequency. When the line voltage drops to approximately two-thirds norm[...]

TYPE 24—Edwards Synchronous Wired Clocks, Type E1 During normal operation, 120Vac is applied between the run motor and common lines to operate the clocks until the 58th minute. At HH:58:00 of each hour, the 120Vac is re - placed by 120Vdc between the correction and common lines for a period of 200ms, with the common line being positive. This puls[...]

TYPE 27—Simplex 2310 Dual Motor Type 27 secondary clocks have the same hourly corrections as type 09, with the addition of 12-hour corrections as for type 03. Power is normally applied to the 1 RPM run motor. Each hour, from HH:58:05 through HH:58:59, power is removed from the run motor and applied to the fast advance motor. During manual clock c[...]

B-32 24A715/24A715M Master Clock Installation Manual Notes[...]

Wiring Diagrams List This appendix contains wiring information and diagrams for the installation of the Dukane 24A715/M Master Clock: C-1 Wiring the 24A715/M for 120Vac Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2 C-2 Wiring the 24A715/M for 220/240Vac Operation . . . . . . . . . . . . . . . . [...]

Wiring the Master Clock for 120Vac or 220/240Vac The master clock is factory-shipped ready for 120Vac. Figure C-1 shows the correct wir - ing for 120Vac operation. Figure C-2 shows the correct wiring and adjusted jumper settings for 220 and 240Vac operation. All circuits should be fused or protected by a circuit breaker (10-amp maximum). C-2 24A715[...]

Wiring Signal Devices to the Master Clock Typically, signal devices (such as bells or lights) are wired to terminal block P3. If no secondary clocks are connected to terminal blocks P1 or P2, signal devices can also be wired to those blocks. See the figures below. Zone 7A and 7B operate together, and 5A and 5B operate together. You can use either o[...]

Wiring the Communications Terminal Block The communications terminal block is on the back of the display unit. See Figure C-6 . It is used to connect the optional modem, a computer, any RS-485 devices, and a power source for the optional remove schedule selector. When making connections to the communications terminal block, keep the following in mi[...]

RS-485—Terminal block pair for RS-485 communications with an IBM-compatible computer running the optional Lathem MasterLink programming software and SWIFT (RS-485 to RS-232 converter). MODEM—Modular connector for modem use. The optional internal modem can be used to dial out to the Atomic Clock at Fort Collins, Colorado, USA, or for a remote si[...]

Wiring RS-485 Time Synchronization Devices Up to 30 RS-485 Data Synchronization Devices (DSDs) can be connected to the sync ter - minals. Since the SYNC IN port can send as well as receive, 30 extra devices can be connected. If more than 60 DSDs are to be connected, another master clock must be used as a booster. Using the Master Clock as a Slave S[...]

Wiring the 12 Volt AC Out Terminals The 12 Volt AC Out Terminals connect to a non-regulated 12V 250mA power source and are used with the optional remote schedule selector (available from Lathem) when in close proximity to the master clock. Contact Lathem Time Corporation for details. —WARNING— This circuit is not fused separately. Attaching dev[...]

Connecting a Computer to the Front Access Port A computer can be temporarily connected to the master clock via the front access port. See the figure below to make a cable for this purpose. C-8 24A715/24A715M Master Clock Installation Manual Figure C-11 Computer Cable for Front Access Port[...]

24A715/24A715M Master Clock Installation Manual D-1 D Appendix Power Supply Schematic C3 C4 C5 D1 1 D10 D9 D12 K1 K2 K3 K4 K6 K7 K8 K5 D3 D4 D5 D6 Figure D-1 Power Supply Schematic for the 24A715/M Master Clock[...]

D-2 24A715/24A715M Master Clock Installation Manual Notes[...]

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DUKANE CORPORATION COMMUNICATIONS SYSTEMS DIVISION - 2900 Dukane Drive, St. Charles, Illinois 60174 © 2001. Printed in USA. All specifications subject to change without notice.[...]