Black Box Short-Haul Modem-FSK Manual
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Black Box Short-Haul Modem-FSK Manual

Rs-485 modules
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Short-Haul Modem-FSK
RS-485 Modules
CUSTOMER
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
SUPPORT
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
INFORMATION
Web site: www.blackbox.com • E-mail: info@blackbox.com
R
R
AUGUST 1997
- F S K
S H M
P W
K
L P B
T x D
R x D
C D
ME840A-M
ME840A-S
MD3317
MD3318
R

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Summary of Contents for Black Box Short-Haul Modem-FSK

  • Page 1 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 SUPPORT Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 INFORMATION Web site: www.blackbox.com • E-mail: info@blackbox.com...
  • Page 2 FCC STATEMENT FEDERAL COMMUNICATIONS COMMISSION INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS 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 been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC rules, which are designed to provide reasonable protection...
  • Page 3 INSTRUCCIONES DE SEGURIDAD NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY STATEMENT 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.
  • Page 4 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.
  • Page 5 SHORT HAUL MODEM (SHM-FSK) TRADEMARKS All applied-for and registered trademarks are the property of their respective owners.

  • Page 6: Table Of Contents

    SHORT HAUL MODEM (SHM-FSK) CONTENTS 1. Specifications..........8 2.

  • Page 7: Specifications

    SHORT 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 Distance —...

  • Page 8: Introduction

    SHORT 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, 156.5KHz).

  • Page 9: Operating Modes

    SHORT 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.
  • Page 10 SHORT HAUL MODEM (SHM-FSK) Figure 2-2 is a pinout of the RS-232 port. SIGNAL SIGNAL DESTINATION NUMBER NUMBER DESTINATION PROTECTIVE GROUND SECONDARY TRANSMITTED DATA TRANSMITTED DATA DCE TRANSMITTER SIGNAL ELEMENT TIMING RECEIVED DATA SECONDARY RECEIVED DATA REQUEST TO SEND RECEIVER SIGNAL ELEMENT TIMING CLEAR TO SEND LOCAL LOOPBACK DATA SET READY...
  • Page 11 SHORT HAUL MODEM (SHM-FSK) Figure 2-3 is an illustration of a typical full-duplex or half-duplex, point-to-point application. Copper Pairs up to 48,000 feet RS-232 RS-232 (9.1 miles or 14.6 km) Cable Cable SHM-FSK SHM-FSK Remote Programmable Telemetry Unit Logic Controller (PLC) Figure 2-3.

  • Page 12: Installation

    SHORT 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 position.
  • Page 13 SHORT 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.

  • Page 14: Operation

    SHORT 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 supplied by the devices connected to the SHM-FSK is either floating or logic high.

  • Page 15: Jumper Settings

    SHORT 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.

  • Page 16: Receiver Gain

    SHORT 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,”...

  • Page 17: Led Indications

    SHORT 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 Carrier Detect Data flowing out of the SHM’s RS-232 port Data flowing into the SHM’s RS-232 port Power connected The first diagnostic LED is Carrier Detect.

  • Page 18: General Operating Notes

    SHORT HAUL MODEM (SHM-FSK) 7. General Operating Notes 7.1 Tuned 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.

  • Page 19: Rs-485 Interface

    SHORT HAUL MODEM (SHM-FSK) 8. RS-485 Interface 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 version, except that the digital interface through the DB25 connector uses pin 12 as the -DO/RI connection and pin 13 as the +DO/RI connection.
  • Page 20 © Copyright 1997. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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