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Black Box RS-485 manual

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Table of contents for the manual

  • Page 1

    CUSTOMER SUPPORT INFORMATION Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 Mail order: Black Box Corporation , 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.com AUGUST 19[...]

  • Page 2

    3 FCC ST A TEMENT FEDERAL COMMUNICA TIONS COMMISSION AND INDUSTR Y CANADA RADIO FREQUENCY INTERFERENCE ST A TEMENTS This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication. It has[...]

  • Page 3

    4 INSTRUCCIONES DE SEGURIDAD NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY ST A TEMENT INSTRUCCIONES DE SEGURIDAD 1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado. 2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura. 3. Todas las ad[...]

  • Page 4

    5 INSTRUCCIONES DE SEGURIDAD 11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de operación, o como se indique en el aparato. 12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada. 13. Los cables de la fuente de poder deben se[...]

  • Page 5

    6 SHOR T HAUL MODEM (SHM-FSK) TRADEMARKS All applied-for and registered trademarks are the property of their respective owners.[...]

  • Page 6

    7 SHOR T HAUL MODEM (SHM-FSK) CONTENTS 1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1 Master Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 7

    8 SHOR T HAUL MODEM (SHM-FSK) 1. Specifications Data Format — RS-232C (RS-422/485 optional) Operation — Full-duplex or half-duplex controlled carrier, serial asynchronous data Mode — Point-to-point or multipoint Data Transmission Speed — Up to 9600 baud Modulation — Frequency shift key; carrier signal inductively and capacitively isolated[...]

  • Page 8

    9 SHOR T HAUL MODEM (SHM-FSK) 2. Introduction The Short Haul Modem (SHM-FSK) is a private-line modem that allows half- and full-duplex RS-232 data communications at 9600 bps over a single dedicated wire pair and across sliding contacts. The SHM-FSK operates using pure Frequency Shift Key (FSK) at high carrier frequencies (100KHz, 106.5KHz to 150KHz[...]

  • Page 9

    10 SHOR T HAUL MODEM (SHM-FSK) 2.3 Operating Mode The SHM-FSKs can be operated in either point-to-point or multipoint polling mode. For multi-drop data communications, the SHM-FSK can be operated with one Master and typically up to eight Remote units. The transmitter in each Remote unit is controlled by the intelligent device it is connected to. Th[...]

  • Page 10

    11 SHOR T HAUL MODEM (SHM-FSK) Figure 2-2 is a pinout of the RS-232 port. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 SECONDARY TRANSMITTED DA T A DCE TRANSMITTER SIGNAL ELEMENT TIMING SECONDARY RECEIVED DA T A RECEIVER SIGNAL ELEMENT TIMING LOCAL LOOPBACK SECONDARY REQUEST T O SEND DA T A TERMINAL READY SIGNAL QUALITY DETECTO[...]

  • Page 11

    12 SHOR T HAUL MODEM (SHM-FSK) Figure 2-3 is an illustration of a typical full-duplex or half-duplex, point-to-point application. Figure 2-3. T ypical Application Connections. Programmable Logic Controller (PLC) SHM-FSK SHM-FSK Remote Telemetry Unit RS-232 Cable RS-232 Cable Copper Pairs up to 48,000 feet (9.1 miles or 14.6 km)[...]

  • Page 12

    13 SHOR T HAUL MODEM (SHM-FSK) 3. Installation The SHM-FSK units are shipped ready for either full-duplex or half-duplex multi-drop operation. The jumpers have been factory-set in full-duplex mode. The Master and Remote units are both factory-configured as DCEs (Data Communications Equipment) with the jumpers on headers P1 and P2 in the B-C positio[...]

  • Page 13

    14 SHOR T HAUL MODEM (SHM-FSK) 3. Confirm that the jumpers on positions P1 and P2 are in the B-C position. 4. Replace the cover. 5. Connect the RS-232 communications port of the digital data device (PC, PLC, etc.) to the SHM-FSK unit with an appropriate cable. 6. Connect the transmission line to the unit at the green pluggable terminal block. There[...]

  • Page 14

    15 SHOR T HAUL MODEM (SHM-FSK) 4. Operation Point-to-point, full- or half-duplex operation is usually conducted with the both the Master and Remote SHM-FSK carriers on all the time. This is achieved by placing the P4 jumper in the B-C position and either not connecting the RTS line (DB25 pin 4) to the SHM-FSKs or making sure that the RTS line suppl[...]

  • Page 15

    16 SHOR T HAUL MODEM (SHM-FSK) 5. Jumper Settings There are several configuration options that can be selected by jumpers as described below. The jumper pins are internal and are identified by lettering on the circuit board. They are accessed by removing the four retaining screws on the top cover of the enclosure and removing the cover. Be sure tha[...]

  • Page 16

    17 SHOR T HAUL MODEM (SHM-FSK) 5.3 Receiver Gain The SHM-FSK incorporates a receiver amplifier on the circuit board. This amplifier has low, normal, and high gain settings configured by a “T” shaped pin block near the center of the circuit board with pins marked “G1/H,” “G2,” “G3/L,” and “N” (the leg of the “T”). G1/H-G2 is [...]

  • Page 17

    18 SHOR T HAUL MODEM (SHM-FSK) 6. LED Indications There are four LEDs on the front panel of the SHM-FSK. From left to right they are: Marking Function CD Carrier Detect RX Data flowing out of the SHM’s RS-232 port TX Data flowing into the SHM’s RS-232 port PWR Power connected The first diagnostic LED is Carrier Detect. In full-duplex mode, the [...]

  • Page 18

    19 SHOR T HAUL MODEM (SHM-FSK) 7. General Operating Notes 7.1 T uned Circuits The SHM-FSK uses tuned circuits to achieve its high performance. These circuits have been carefully adjusted at the factory to operate over several miles of transmission line. In order not to degrade performance, it is important not to disturb these adjustments. In partic[...]

  • Page 19

    20 SHOR T HAUL MODEM (SHM-FSK) 8. RS-485 Inter face Optional RS-485 modules are available for connection to multiple remote devices. The following modules are available: • RS-485 Module 2-Wire, part number MD3317 • RS-485 Module, 4-Wire, part number MD3318 All operating functions and instructions are the same as for the RS-232 full duplex versi[...]

  • Page 20

    1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746 © Copyright 1997. Black Box Corporation. All rights reserved.[...]