Bay Technical Associates DS72 - Manual (Page 11)

DS72 HOST MODULE OWNER’S MANUAL
CABLING
6
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.