Connect Tech DFlex-4/104 - Manual (Page 64)

4-14 Chapter 4: Appendix E - RS-232 Option
DFlex-4/104 User’s Manual, ver. 0.04
Please refer to Figure 13 for a partial schematic of the RS-232 or
RS-232/Fast SLIM
Figure 13: RS-232; RS-232/Fast SLIM: partial schematic
UART
RS-232 & RS-232/Fast SLIM
Partial Schematic
DB9
Connector
DTR
RXD
RTS
1
3
8
2
4
7
CTS
TxD
DCD
5
SG
Note: The RS-232 and RS-232/Fast Serial Line Interface Module
controls two ports, and therefore the schematic shows only a
portion of the circuit.