User Guide

DS72 HOST MODULE OWNER’S MANUAL

CABLING

RJ-45 CABLES AND ADAPTERS

IMPORTANT:

The DS72 network interface module has an RJ-45 port which uses an 8-pin

crossed modular cable to connect to a local EIA-232 device such as a computer terminal or

external modem. Most serial computers do not have RJ-45 connections; therefore an adapter is

provided with this unit to convert from a DE-9 connector to an RJ-45 connector (Bay Tech Part

No. 9FRJ45PC-4). An adapter to convert from a DB-25 connector to an RJ-45 connector is also

available from Bay Tech, upon request (Bay Tech Part No. 25FRJ45PC-4). The 8-pin crossed

modular cable is configured to operate with these adapters.

CAUTION:

All power should be removed from the DS72 unit prior to removing or installing

cables.

The DS72 Ethernet connection requires a straight cable between the ethernet port of the DS72 module and

the network hub. The “LINK” light will light green when a good link has been established.

DS72 EIA-232 RJ-45 Pin/Signal Definition

Pin EIA-232

Signal

Description

1 Handshake Out (DTR) Line Driver Inactive State = High: +12V when power is applied.

Used as a handshake line to enable/disable the receiving of characters.

2 Gnd Signal ground

3 Handshake Out (RTS) Line Driver Inactive State = High: +12 V when power is applied. Not

used to enable/disable.

4 TX Out Transmit Data (data out)

5 RX In Receive Data (data in)

6 Handshake In (DSR) Handshake In. –12V when not used.

7 Gnd Signal ground

8 Handshake In (CTS) Used as a handshake line to enable/disable the receiving of

characters.