GFK-0356Q
Appendix D IC690ACC901 Miniconverter Kit
D-3
D
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
RXD
TXD
RTS
CTS
GND
DCD
DSR
DTR
RXD
TXD
RTS
CTS
GND
DCD
DSR
DTR
2
3
7
8
5
2
3
7
8
5
TXD
RXD
CTS
RTS
GND
TXD
RXD
CTS
RTS
GND
PIN
PIN
2
3
7
8
5
1
6
4
3
2
4
5
7
8
6
20
MINICONVERTER
RS-232 PORT
9-PIN
CONNECTOR
MINICONVERTER
RS-232 PORT
9-PIN
CONNECTOR
IBM PC-AT
9-PIN
CONNECTOR
WORKMASTER II,
IBM PC-XT, PS/2
25-PIN
CONNECTOR
PIN
PIN
a44982
a44983