Connect Tech DFlex-4/104 - Manual (Page 73)

Chapter 4: Appendix G - RS-423 Options 4-23
DFlex-4/104 User's Manual, ver. 0.04
Appendix G: RS-423 Options
You may order the DFlex-4/104 adapter with RS-423 Serial Line
Interfaces Module. The RS-423 electrical interface is a reliable
high-speed serial link that offers superior noise immunity.
WARNING
You must insert Serial Line Interface Modules into all of the SLIM
sockets to attain the communications functionality of your
DFlex-4/104 adapter.
Please refer to Figure 17 for a partial schematic of the RS-423
SLIM circuit
Figure 17: RS-423 SLIM partial schematic
UART
RS-423 SLIM
Partial Schematic
DB9 Connector
RxD-
RTS-
1
3
9
4
8
7
CTS+
TxD-
TxD Ref
2
6
CTS-
RxD+
NET 2
NET 1
NET 1 NET 2
22K
22K
-
+
+5V
22K
22K
-
+
+5V
RTS Ref
5
SR
Note: Note: The RS-423 Serial Line Interface Module controls
two ports, and therefore the schematic shows only a portion of the
circuit.