Serial Connector; Cable Information; State Logic Scm Documentation - GE 90-30 PLC Series Installation And Hardware Manual

Serial Connector

The SCM front-mounted serial port connector provides all of the connections for the two SCM
serial ports. Separate pins on this connector are assigned for Port and Port 2. Both ports support
RS-232 standard. Only Port 2 supports the RS-485 standard. A special WYE cable, described
below, is available from GE to separate the two port connections on the connector.

Cable Information

Cable IC693CBL305 can be used in applications that require use of both SCM serial ports. This is
a Wye-type cable that breaks out the Port and Port 2 connections on the module's single
connector to two individual connectors. A data sheet for this cable can be found in the "Cables"
chapter of this manual. (Additional SCM cable information is found in the two documents
referenced in the next section.) This cable wouldn't be required for applications that use only one
SCM port. Also, this cable should not be used in a multidrop network (see Caution note below).
Figure 9-2. IC693CBL305 WYE Cable

State Logic SCM Documentation

GFK-0356Q Chapter 9 State Logic Products
The IC693CBL305 Wye cable should not be used with an SCM connected to
a multidrop network because it introduces signal reflections on the network.
Multidrop networks should be cabled directly to the SCM serial connector.
RS-232
PIN 1
25-PIN MALE
CONNECTOR
GFK- 66 (Data Sheet), Serial Communications Module, Series 90-30 State Logic
GFK- 056, Series 90-30 State Logic Control System User's Manual
Caution
1 FOOT
(+2.0 INCH, -0 INCH)
LABEL
PCM COMM.
IC693CBL305
CABLE
B
9
RS-232
25-PIN FEMALE
CONNECTOR
PIN 1
PORT 1
PORT 2
RS-232/RS-485
PIN 1
25-PIN FEMALE
CONNECTOR
9-3