Comtrol VS1100 Configuration Guide - Manual (Page 22)

22 Serial Cable Specifications
Building Cables
Building an RJ45 to DB25 Cable
Use the following figures if you need information about building a
general-purpose DTE-to-DTE null modem cable or a DTE-to-DCE
modem cable.
Modem Cable
RJ45
Pin
1
2
3
4
5
6
7
8
Signal
RTS
DTR
GND
TxD
RxD
DCD
DSR
CTS
DB25
Pin
4
20
7
2
3
8
6
5
Signal
RTS
DTR
GND
TxD
RxD
DCD
DSR
CTS
DTE-to-DCE Modem Cable*
* Can be ordered from Comtrol.
RJ45
Pin
4
5
1
8
7
6
2
3
Signal
TxD
RxD
RTS
CTS
DSR
DCD
DTR
GND
DB25
Pin
2
3
4
5
20
8
6
7
Signal
TxD
RxD
RTS
CTS
DTR
DCD
DSR
GND
General-Purpose DTE-to-DTE Null Modem Cable