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Watlow Electric 945 manual

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Table of contents for the manual

  • Page 1

    1 WATLOW Series 945 How to Use Data Communications User's Manual $5.00 Made in the U.S.A. Printed on Recycled Paper W945-SA50-9210 March, 1992 Supersedes: W945-SA40-9119 Ho w T o Use Data Comm unications with the W atlo w Series 945 Watlow Controls, 1241 Bundy Blvd., P.O.Box 5580, Winona, MN 55987-5580, Phone: 507/454-5300, Fax: 507/452-4507[...]

  • Page 2

    How to Use Data Communications 2 WATLOW Series 945 Page Item 3 Data Communications and the Series 945 3 Hardware Interfaces Protocols 3 Communications Wiring 4 RS-422A Interface Pinouts 5 RS-423A Interface Pinouts (RS-232C Compatible) 6 EIA-485 Interface Pinouts 6 Connecting the Control and Computer 7 Setting Hardware Protocol Switches 7 Network Co[...]

  • Page 3

    3 WATLOW Series 945 How to Use Data Communications This manual is a supplement to the Series 945 User's Manual. It is for users with the data communications option. Use in conjunction with the Series 945 User's Manual. This is expert user-level material and requires previous experience with data communications. T wo Serial Har d ware Inte[...]

  • Page 4

    How to Use Data Communications 4 WATLOW Series 945 19 20 21 22 23 T + T - R + R - Signal Common (Optional) Series 945 # 1 Series 945 #1 0 Twisted Pair Wire 1 2 3 4 5 9 8 7 6 19 20 21 22 23 T + T - R + R - Signal Common (Optional) Twisted Pair Wire T + T - R + R - Com Host Computer (rear view) DB-9 female connector (viewed from wire side) RS-422A RS[...]

  • Page 5

    5 WATLOW Series 945 How to Use Data Communications RS-423A Interface Pinouts (RS-232C Compatible) 945A-XXXX-B000 The RS-423A communications uses a three wire (full duplex) system. There is a separate line for transmitting, a line for receiving data, and a line for signal common between the computer and the Series 945. With RS-423A you can have only[...]

  • Page 6

    How to Use Data Communications 6 WATLOW Series 945 EIA-485 Interface Pinouts 945A-XXXX-D000 The EIA-485 communications uses a two wire (half duplex) system. There are only two lines, both lines used for transmitting and receiving. Only one device, the computer or the control, can be speaking at a time. There is a 1 millisecond delay requried for th[...]

  • Page 7

    7 WATLOW Series 945 How to Use Data Communications Control Chassis - Top View Configuration (Up) RS-423 A (Down) RS-422 A (Up) RS-423A (Down) RS-422A Figure 4 - RS-422A/RS-423A Switch Selection. NOTE: The Series 945 leaves the factory in RS-423A operation (C1). How to Set the Har dware Pr otocol Switches for 945A-XXXX-B000 Units Only The RS-422/RS-[...]

  • Page 8

    How to Use Data Communications 8 WATLOW Series 945 P arameters Setup Menu - Comm unications P arameters Enter the Setup menu by pressing the UP/DOWN keys simultaneously for 3 seconds. The lower display shows the LOC parameter, and the upper display shows its current level. All keys are inactive until you release both keys. You can reach the LOC par[...]

  • Page 9

    9 WATLOW Series 945 How to Use Data Communications Minutes: Represents the 24 hour time-of-day clock setting for minutes. Appears if Prot = On and Log = tAbL, CHrt or SPCA, SPCd, SPCn. Parameter resets to default after a power interruption. Range: 0 to 59 Default: 0 Interval: Selects the time interval for the logging function. The logging interval [...]

  • Page 10

    How to Use Data Communications 10 WATLOW Series 945 ASCII Char . ASCII Ctrl Key Definition Dec. Hex. Char. Equiv. Equiv. Equiv. ENQ Ctrl E Enquiry 5 05 ACK Ctrl F Acknowledge 6 06 NAK Ctrl U Neg. Acknowledge 21 15 STX Ctrl B Start of Text 2 02 ETX Ctrl C End of Text 3 03 EOT Ctrl D End of Transmission 4 04 DLE Ctrl P Data Link Escape 16 10 CR Ctrl [...]

  • Page 11

    11 WATLOW Series 945 How to Use Data Communications Syntax Message Syntax Messages from your computer to the Series 945 must take this general form. All commands do not require the full number of data fields. Command <Space> Data.1 <Space> Data.2 <Space> Data.3... Data.N "Command" is a character set to which the Series 9[...]

  • Page 12

    How to Use Data Communications 12 WATLOW Series 945 ASCII Example Format For your benefit, we're presenting message/response examples with syntax re- quired for Series 945 communication. Information bracketed by < > indicates a description, rather than literal characters. We show each ASCII character that you must transmit to the Series [...]

  • Page 13

    13 WATLOW Series 945 How to Use Data Communications XON/XOFF "=" Figure 6 - XON/XOFF "=" Command Example. ASCII Characters HEX Value 1 Space 5 0 0 41 4C 31 20 35 30 30 <Space> = 3D 20 A L <CR> 0D 4F O <XON> 13 11 <XOFF> XON/XOFF "=" Command Example The general command syntax is the one you'[...]

  • Page 14

    How to Use Data Communications 14 WATLOW Series 945 Figure 7 - XON/XOFF "?" Command Example. XON/XOFF "?" XON/XOFF "?" Command Example You want to know the Alarm 1 Low (A1LO) value. The "?" uses a variation of the message syntax shown just below. This protocol requires an ending carriage return character. &qu[...]

  • Page 15

    15 WATLOW Series 945 How to Use Data Communications ANSI X3.28 Table 4 - Address to ASCII Conversion. Device Address If you are using the ANSI X3.28 Protocol, you must have a device address (identifi- cation) number. A Watlow RS-422A multidrop network can handle up to 10 de- vices with this protocol. EIA-485 can handle up to 32 devices. Set the add[...]

  • Page 16

    How to Use Data Communications 16 WATLOW Series 945 ANSI X3.28 "=" Figure 8 - ANSI X3.28 "=" Command Example. ANSI X3.28 "=" Command Example The "=" Command sets a specific 945 parameter to a specific value. The general command syntax applies to all commands. The definition and number of argu- ments depends o[...]

  • Page 17

    17 WATLOW Series 945 How to Use Data Communications ANSI X3.28 "?" Figure 9 - ANSI X3.28 "?" Command Example. ANSI X3.28 "?" Command Example You need to know the Alarm 1 Low value (A1LO). The "?" uses a variation of the message syntax shown just below. This syntax requires the protocol start of text and end o[...]

  • Page 18

    18 WATLOW Series 945 How to Use Data Communications Commands Data.1 Respns Information Comments C1 ACTUAL Actual process value Between R1L and R1H IN 0 J T/C 1 K T/C 2 T T/C 3 N T/C 4 PT2 T/C 5 C T/C 6 Not Used 7 R T/C 8 S T/C 9 B T/C 10 RTD whole 11 RTD tenths 12 0-5V 13 4-20mA MODE 1 Auto mode Multiple modes are possible. 2 Manual mode 4 Configur[...]

  • Page 19

    How to Use Data Communications 19 WATLOW Series 945 Commands Data.1 Data.2 Low Limit High Limit Code Function AXHI Process RL value RH value Alarm High X value ± 555/Deviation ± 999 A XLO Process RL value RH value Alarm Low X value ± 555/Deviation ± 999 ALM 0 No alarms occurring Writing a 0 will clear all 1 A1H occurring alarms if the alarm 2 A[...]

  • Page 20

    20 WATLOW Series 945 How to Use Data Communications Commands Data.1 Data.2 Low Limit High Limit Code Function LAT X 0 1 0 Latched alarms 1 Non-latched alarms LINE 10 127 Lines per page for data logging LOC 0 3 Lock front panel LOG 0 3 0 Logging OFF See Page 22. 1 Table 2 Chart 3 SPCA 4 SPCd 5 SPCn L-R 0 1 0 Local set point 1 Remote set point LSL rL[...]

  • Page 21

    How to Use Data Communications 21 WATLOW Series 945 Data Logging Figure 10 - Data Logging Interface Wiring Example. Data Logging The data logging feature is a convenient replacement for chart recorders. Informa- tion is sent directly from the Series 945 to a serial printer, or to a computer disk file. No computer is needed, although the 945 can be [...]

  • Page 22

    22 WATLOW Series 945 How to Use Data Communications Data Logging Figure 11 - Table Printout Example. SPC - Statistical Pr ocess Contr ol SPC tracks variability to help you distinguish between natural variability (common causes) from unnatural variability (special causes). Based upon measurements, SPC gives you a picture of how the process is perfor[...]

  • Page 23

    How to Use Data Communications 23 WATLOW Series 945 SPC The Difference Between Contr ol & Specification Limits Control limits are established on the control chart at ± 3 standard deviations (3 sigma) . They are based upon the distribution of sample averages and are calculated from the actual performance of the process. They are typically narro[...]

  • Page 24

    24 WATLOW Series 945 How to Use Data Communications Char t & SPC NOTE: The time is printed every 5th interval (Int). The tempera- ture variable (*) is printed every 10th interval. One Int = 6 seconds. Figure 12 - Chart and SPC Printout Example 100 ° F 125 75 PROCESS DATE: 01-01-90 * * * * * * CPKL = 1.36 CPKU = 1.32 L L L L L L L L L L L L L L[...]

  • Page 25

    How to Use Data Communications 25 WATLOW Series 945 Error Codes Table 7 - Printer Troubleshooting. Problem Cause Action Printing all on The line feed Set the printer for a carriage the same line. is missing. return and line feed. The printing is Data formats are Match the Series 945 data garbled. not compatible. format to the printers data format u[...]

  • Page 26

    26 WATLOW Series 945 How to Use Data Communications Inde x A ALM, 20 ANSI X3.28 "=" Command, Fig. 8, 17 ANSI X3.28 "?" Command, Fig. 9, 18 ANSI X3.28 Protocol for RS-422A & EIA-485, 3, 16 ASCII Character Set, Table 1, 10 ASCII Control Characters (Partial Set), Table 2, 10 A XHI, 20 A XLO, 20 ATMN, 20 AUT, 20 B Baud Rate, 8 B[...]

  • Page 27

    How to Use Data Communications 27 WATLOW Series 945 Notes[...]

  • Page 28

    28 WATLOW Series 945 How to Use Data Communications Series 945 Data Communications User's Manual Watlow Controls, 1241 Bundy Blvd., Winona, MN 55987, Phone: 507/454-5300, Fax: 507/452-4507[...]