27
PIN
Signal
Direction
Limits
Description
1
nc
-
-
Not connected
2
B
Differential
5V
RS485-B
3
G
-
-
Optional shielding
4
A
Differential
5V
RS485-A
5
GND
-
0V
Ground connection
6
nc
-
-
Not connected
7
nc
-
-
Not connected
8
nc
-
-
Not connected
9
nc
-
-
Not connected
Table 10: Electrical characteristics of the RS485-serial port signals