Appendix A: Specifications
201
RJ45-to-DB9 Cable Requirements for Computer Connections
An RJ45-to-DB9 adapter/cable is required for connecting the PDU to a computer, if the use of a USB cable is not intended.
A third party RJ45-to-DB9 adapter/cable needs to meet the following requirements.
•
RJ-45 to "DB9 female"
•
RX/TX and according control pins are CROSSED
The widespread blue Cisco RJ-45 to DB9 adapter cable is highly recommended, which has the following pin assignments:
DB9 pin signal
DB9 pin No.
RJ-45 pin No.
RJ-45 pin signal
CTS
8
1
RTS
DSR
6
2
DTR
RxD
2
3
TxD
GND
5
4
GND
GND
5
5
GND
TxD
3
6
RxD
DTR
4
7
DSR
RTS
7
8
CTS
DCD
1 (Not connected)
N/A
RI
9 (Not connected)
Sensor RJ-45 Port Pinouts
RJ-45 Pin/signal definition
Pin No.
Signal
Direction
Description
1
+12V
―
Power (fuse protected)
2
+12V
―
Power (fuse protected)
3
GND
―
Signal Ground
4
RS485_DP
bi-directional
Data Positive of the RS-485 bus
