Instruction/ maintenance manual of the product ME840A-S Black Box
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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.
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.
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.
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.
6 SHOR T HAUL MODEM (SHM-FSK) TRADEMARKS All applied-for and registered trademarks are the property of their respective owners..
7 SHOR T HAUL MODEM (SHM-FSK) CONTENTS 1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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-po.
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.
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.
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 .
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.
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.
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.
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.
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.
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”).
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.
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.
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.
1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746 © Copyright 1997. Black Box Corporation. All rights reserved..
An important point after buying a device Black Box ME840A-S (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Black Box ME840A-S yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Black Box ME840A-S - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Black Box ME840A-S you will learn all the available features of the product, as well as information on its operation. The information that you get Black Box ME840A-S will certainly help you make a decision on the purchase.
If you already are a holder of Black Box ME840A-S, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Black Box ME840A-S.
However, one of the most important roles played by the user manual is to help in solving problems with Black Box ME840A-S. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Black Box ME840A-S along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
