HP A4500A - VMEbus Single Board Computer 744 Motherboard Manual page 98

9 Adapting to a 10BaseT cabling system
DTC Pin # on Port number -
50-pin RS-423/RS232
connector signal
DTC
RS-423/RS-232
Pin # on RJ45
signal
connector
1 RXa/RD
2 RXb/-
3 TXa/TD
4 CTS
5 RTS
6 TXb/SGND
7 Not Used
8 Not Used
92
Jumpers
This conversion can also be achieved using RJ45 patch panels:
10BaseT
cable
jumpers
(4 wires)
<--------->
<--------->
<--------->
<--------->
10BaseT
Port number -
Pin # on
RS-423/RS-232
50-pin
signal
connector
45 P7 - TXa/TD
20 P7 - TXb/SGND
46 P7 - RXa/RD
21 P7 - RXb/-
47 P7 - TXa/TD
22 P7 - TXb/SGND
48 P7 - RXa/RD
23 P7 - RXb/-
49 P7 - TXa/TD
24 P7 - TXb/SGND
50 P7 - RXa/RD
25 P7 - RXb/-
10BaseT
RS-423/RS-232
Pin # on RJ45
signal
connector
1 RXa/RD
2 RXb/-
3 TXa/TD
4 Not Used
5 Not Used
6 TXb/SGND
7 Not Used
8 Not Used
Pin # on RJ45
connector
3
6
1
2
3
6
1
2
3
6
1
2
Pair
2
2
3
1
1
3
4
4