This conversion can also be achieved using RJ45 patch panels:
DTC
RS-423/RS-232
Pin # on RJ45
signal
connector
1
RXa/RD
2
RXb/-
3
TXa/TD
4
RTS
5
CTS
6
TXb/SGND
7
Not Used
8
Not Used
6-wire
ATT356A
ATT356A
Pin # on RJ45
cable
connector
jumpers
<--------->
1
<--------->
2
<--------->
3
<--------->
4
<--------->
5
<--------->
6
7
8
Adapting to ATT356A cabling system
RS-423/RS-232
Pair
signal
RXa/RD
2
RXb/-
2
TXa/TD
3
RTS
1
CTS
1
TXb/SGND
3
Not Used
4
Not Used
4
9
89