4.1.6 Slot #2, serial communication (option H)
Modbus (option H2)
Term.
Function
Description
29
DATA + (A)
Modbus RTU, RS-485
30
GND
31
DATA - (B)
32
Not used
33
DATA + (A)
34
Not used
35
DATA - (B)
36
Not used
The serial communication line should be terminated between DATA + and DATA - with a resistor equal to the
cable impedance. The terminals 29/33 and 31/35 are internally connected.
Never connect the GND terminal 30 to earth. Only connect it to a third wire in the communica-
tion cable!
Profibus (option H3)
Term.
Function
Description
29
DATA + (B)
Pin 3 on 9 pole sub-D connector
Pin 5 on 9 pole sub-D connector
Pin 8 on 9 pole sub-D connector
30
GND
31
DATA - (A)
32
DATA + (B)
33
GND
34
DATA - (A)
35
Not used
36
Not used
Never connect the GND terminal 30 to earth. Only connect it to a third wire in the communica-
tion cable!
AGC-3 installation instructions 4189340728
UK
Hardware
DEIF A/S
Page 25 of 65
