4
Modbus Box Quick Guide
V.1.1
4.3 RS-485 Resistance Configuration
4.4 Interface Configuration
RS-485 Pin Configuration
Pin
Function
4
RS-485 - B
5
RS-485 - A
8
GND
RS232 Pin Configuration:
Pin
Function
1
Txd
2
Rxd
8
GND
USB spec
Voltage 5V DC
Current 500 mA
USB port is used as input power source, not for communication purpose.
Function
Bit #
Setting
Meaning
Push up
resistance
# 6
ON
Enable (Default)
OFF
Disable
Push down
resistance
# 7
ON
Enable (Default)
OFF
Disable
Terminate
resistance
# 8
ON
Enable (Default)
OFF
Disable
