Owner`s manual

M SERIES DAC

CABLING

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NOTE: If you wish to use RJ-11 (4-wire) cabling, connect pins 3 through 6

on the RJ-45 connector as shown above. In addition, you should enable

XON/XOFF handshaking as described on page 49.

V71 DB-25 CABLING FOR EIA-422

IMPORTANT: If you intend to use EIA-422 line interface utilizing the

DB-25 connector on the V71, you must change the jumper setting on the

V71 board as described below.

The V71 supports EIA-232, EIA-422, and current loop line interface. Line interface

is programmed by accessing the configuration mode. From the factory, the DB-25

port and the EIA-232 RJ-45 port are the communication ports when EIA-232 line

interface is selected. The DB-25 port is the communication port if current loop line

interface is selected. The EIA-422/485 RJ-45 port is the communication port when

EIA-422 line interface is selected. You can change the DB-25 port to support EIA-

422 line interface by changing a jumper setting on the V71 board. If you wish to

change the jumper setting to allow the DB-25 port to support EIA-422 line interface,

use the following procedure:

If the V71 is installed in the M Series chassis, remove power from the unit

by positioning the on/off switch to the off position and removing the power

cord from the AC outlet. Unscrew the two straight slot screws securing the

V71 to the back panel and pull the module out.

Refer to the drawing below to locate jumper JP4. The board is marked 232

for EIA-232 line interface and 422 for EIA-422 line interface. JP4 has six

pins and a dual shunt jumper. The center two pins are common pins. To

change the existing jumper setting to support the desired line interface,

position the dual shunt jumper so that it connects the two common pins and

the two 232 pins or the two 422 pins.

The V71 DB-25 port uses the following signals when configured for EIA-422

communication:

DB-25 PIN/SIGNAL DEFINITION FOR EIA-422 LINE INTERFACE

EIA-422

Signal

Direction Description

1 PGND ---- Protective Ground

2 TX- Output Transmit Data (-)

3 RX- Input Receive Data (-)

5 HSI Input Handshake In, enable/disable the

transmission of characters