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Troubleshooting
Pin
7
8
9
Note
Twisted pairs are 2-5, 6-8, 4-7.
The X.21, V.35, RS-485, EIA-449, EIA-530, and IRIG-B standards are not currently supported by software.
Note
RJ-45 Connector Pinouts
The table below summarizes the pinouts for each serial interface type when using an RJ-45 connector.
Table 20: RJ45 Pinout
Pin
1
2
3
4
5
6
7
8
Twisted Pairs are: 1-2, 3-6, 4-5, 7-8.
Note
Standard DB-9
Direction
RTS
Output
CTS
Input
NC/GND
Standard DB-9
Direction
RTS
Input
DTR
Input
TxD
Input
GND
GND
RxD
Output
DST
Output
CTS
Output
Description
RS-485
RTS
TxD+
CTS
RxD+ (
Unused or Ring
NC
Description
RS-485
Ready to send
RxD+ (RS485)
DTR
RxD- (RS485)
Transmit
NC
Signal ground
Gnd
Signal ground
Gnd
Receive data
IRIG-B (RS232)
DSR
TxD-
CTS
TxD+
Cisco ASR 907 Router Hardware Installation Guide
Serial Cable Pinouts
IRIG-B
IRIG-B+
NC
NC
IRIG-B
NC
NC
NC
Gnd
Gnd
IRIG-B (RS232)
IRIG-B-
(RS485)
IRIG-B+
(RS485)
131
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