F901 Controller Manual
Page
4
of
27
MODBUS Connection (RS485)
Pin Description
Pin
Name
Type
Description
1
NC
No Connection
2
GND
Reference potential
Local device ground
3
NC
No Connection
4
B (D-)
Bus In/Out
Driver output and receiver input
5
A (D+)
Bus In/Out
Driver output and receiver input
6
NC
No Connection
7
NC
No Connection
8
NC
No Connection
Electrical Parameters
Parameter
Min
Max
Voltage range at A or B
-7V
12V
Differential Threshold Voltage (Receiver)
-0.2V
0.2V
Differential Output Voltage (Transmitter)
1.5V
5V
Input Current (12V)
-0.8mA
1mA
Input Resistance
12k
Ω
Electrostatic discharge at A and B
±8kV
