Black Box ME806A User manual

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ME806A
J1
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
TD
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***

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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.