GE 90-30 PLC Series Installation And Hardware Manual page 379

System Configurations
The Miniconverter can be used in a point-to-point configuration as described above, or in a
multidrop configuration with the host device configured as the master and one or more PLCs
configured as slaves.
The multidrop configuration requires a straight through (1 to 1) cable from the Miniconverter's RS-
422 port to the first slave PLC's SNP port. Other slaves will require a daisy chain connection
between slaves. A maximum of eight devices can be connected in an RS-422 multidrop
configuration. All of the devices must have a common ground. If ground isolation is required, you
can use the GE Isolated Repeater/Converter (IC655CCM590) in place of the Miniconverter.
When using the Miniconverter with a modem connection, it may be necessary to jumper RTS to
CTS (consult the user's manual for your modem).
Cable Diagrams (Point-To-Point)
When connecting the Miniconverter to IBM PC and compatible computers with hardware
handshaking, the following cable connections should be used.
Figure D-2. Miniconverter to PC-AT
Figure D-3. Miniconverter to Workmaster II, PC-XT, PS/2
GFK-0356Q Appendix D IC690ACC901 Miniconverter Kit
PIN PIN
TXD 2
RXD 3
CTS 7
RTS 8
GND 5
MINICONVERTER IBM PC-AT
RS-232 PORT
9-PIN CONNECTOR
CONNECTOR
PIN PIN
TXD 2
RXD 3
CTS 7
RTS 8
GND
5
MINICONVERTER WORKMASTER II,
RS-232 PORT IBM PC-XT, PS/2
9-PIN
CONNECTOR CONNECTOR
a44982
2 RXD
3 TXD
7 RTS
8 CTS
5 GND
1 DCD
6 DSR
4 DTR
9-PIN
a44983
3 RXD
2 TXD
4 RTS
5 CTS
7 GND
8 DCD
6 DSR
20 DTR
25-PIN
D
D-3