Deif AGC-3 - Page 57

The RS-485 Modbus lines need end resistors (end terminators) when the bus length exceeds 30
m. If end resistors are needed, we recommend to install them like this:
Multi-line 2
DATA + (A)
29 30 31
DATA (GND) DATA - (B)
Multi-line 2
DATA + (A)
29 30 31
DATA (GND) DATA - (B)
Multi-line 2
DATA + (A)
29 30 31
DATA (GND) DATA - (B)
DATA - (B)
PLC or other device
DATA (GND) DATA + (A)
1nF (10V min)
120ohms
1nF (10V min)
120ohms
1/4W
1/4W
Cable: Belden 3105A or equivalent. 22 AWG (0.6 mm
2
) twisted pair, shielded, <40 mΏ/m, min.
95 % shield coverage.
AGC-3 installation instructions 4189340728
UK
Wirings
DEIF A/S Page 57 of 65