Black Box ME806A Bedienungsanleitung

TX+

TX-

RX+

RX-

ME806A

DB25

CONNECTOR

SPECIFICATIONS:

Interface: Parallel

Connectors: (1) DB25 Male connector; (1) 4-screw

terminal block.

Indicators: (2); (1) TD and (1) Busy

TD Green and Red = Data Transmission

Green = Mark (idle state)

Red = Error condition. Check cabling

Busy Red = Printer is not online or not ready to

receive data.

Off = Printer is ready to receive data and

cabling is installed correctly.

Red = Printer is not online or not ready to

receive data.

Power: 120 VAC +/- 10%, 60 Hz, 1 watts, wall-mount

transformer

BUSY

TERMINAL

BLOCK

1200

2400

4800

9600

19.2

8-7B

NP-P

E-O

ONOFF

Bit Rate (bps)

2400 4800 9600 19.2K

Distance in miles 5321.1

NOTE:

These specifications are valid for unshielded twisted-

pair cabling having 24 or 26 AWG connectors. Shielded

twisted-pair cable will reduce the distance to 1/3 of the

table value.

DESCRIPTION:

The SHM-B Parallel performs three functions:

The SHM-B Parallel-T accepts parallel data from the PC, converts it to serial data, and sends the serial data over twisted-pair cable to the SHM-B Parallel-R. The SHM-B Parallel-R

receives the serial data, converts it back to parallel data, and sends it to the parallel printer.

Parallel Input 4-Wire Cable Parallel Output

From PC To Printer

SHM-B Parallel-T SHM-B Parallel-R

ME806A ME807A

The SHM-B Parallel-T accepts parallel data from the PC, converts it to serial data, and sends the serial data over twisted-pair cable to the SHM-B (serial). The Serial SHM-B

receives the serial data, converts it to RS-232 specifications, and sends the data to the RS-232 serial printer.

Parallel Input 4-Wire Cable Serial Output

SHM-B Parallel-T SHM-B (serial)

ME806A ME800A

The Serial SHM-B accepts the RS-232 data from the PC, converts it to serial data, and sends it over the twisted-pair cable to the SHM-B Parallel-R. The SHM-B Parallel-R receives

the serial data, converts it to parallel data, and sends it to the parallel printer.

Serial Input 4-Wire Cable Parallel Output

From PC To Printer

SHM-B (Serial) SHM-B Parallel-R

ME800A ME807A

The SHM-B Parallel performs data transmission at bit rates from 1200 to 19,200 baud. It can be configured for either 7 or 8-bit word length and Even, Odd, or No parity. The SHM-

B Parallel features advanced optically-isolated integrated circuitry, which eliminates damaging ground-loop currents and substantially reduces signal noise for improved data integrity.

The SHM-B Parallel transmitter/receiver pair requires only two twisted-pair wires to transmit and receive data. Optimum performance is obtained with 24 or 26 AWG twisted-pair

cabling, but nearly any twisted-pair cable can be used with little or no performance degradation.

NOTE:

When operating serial to parallel or parallel to serial, the serial device has to run

hardware flow control. Software flow control (X-ON/X-OFF) is not supported

***THIS UNIT WILL NOT SUPPORT BI-DIRECTIONAL DATA***

RX+

RX-

TX+

TX-

TX+

TX-

RX+

RX-

WIRING DIAGRAM

INSTALLATION:

The SHM-B Parallel is available in a standalone version and a rackmount version. The standalone transmitter and receiver are packaged in small, lightweight ABS plastic cases and equipped with wall-mount transformers, for use on a desktop or shelf. The printed

circuit card can be removed from the case and the transformer and modular plug discarded, enabling the card to be installed in a rack is desired. The rackmount version slips easily into a 8- or 16-card rack or enclosure.

Connectors:

Each unit is equipped with a DB25 connector and a 4-wire terminal block with a modular plug. The modular plug can be removed if desired. The DB25 connector conforms to the IBM PC Parallel interface pinout, utilizing the Centronics interface protocol. The 4-wire

terminal block is the serial interface to the twisted-pair line.

Installation Procedure:

Before installing the receiver or transmitter, make certain the unit is not plugged into the power source, and the equipment that you are going to attach to them is turned off. Each unit is ready to use as it comes from the factory. No changes are necessary when

used as a modem set to transmit data from a parallel device to another parallel device at distances of up to 1.1 miles. However, for installations in which the loop-length exceeds 1.1 miles, data corruption may occur due to excessive line noise and /or capacitance. In

this case, reduce the transmission baud rate, using configuration procedure.

Installation is accomplished in the following three steps:

1. Connect Cabling: For installation utilizing modular cables, connect a 4-wire twisted-pair cable into the modular connector on the back of each SHM-B Parallel. For installations that do not use modular cables, remove the modular adapter from the terminal

block (located on the printed circuit card) and use a 4-wire twisted-pair cable. Remove the card from the case or rack and unscrew the lead from the plug to the terminal connector on the card. Strip 1/8 to 3/16 inch of the insulation from the end of all

four of the cable wires. Insert the wires into the terminal block and tighten the screw terminals. Connect the terminals on the transmitter to the terminals on the receiver as shown below.

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