Modbus (Option H2) - Deif AGC 200 Installation Instructions Manual

AGC 200 installation instructions
4189340610 UK

5.3.2 Modbus (option H2)

Multi-line 2
29 3 0 31
PLC or oth er device
Connect AGC GND to AGC GND only via cable screen. Shield ends must be insulated with tape
or insulation tubing.
The AGC GND terminal connection to cable screen must NOT be connected to 3rd party equip-
ment unless the RS-485 gateway of this equipment is galvanically isolated from the rest. Do not
connect cable screen to ground.
Normally, the Modbus does not need end terminating resistors. These are only needed in case
of very long lines. If required, use 2 × 120 Ω 1/4 W resistors; place one resistor at each end of
the RS-485 bus.
Cable: Belden 3105A or equivalent. 22 AWG (0.6 mm
95 % shield coverage.
The AGC 200 has a fail-safe biasing function. It has internal 750 Ω pull-up and pull-down resis-
tors. Only one set of pull-up and pull-down resistors should be used at a time. Enable in one
unit only. The biasing is selected in setting 7513.
DEIF A/S
Multi-line 2
29 3 0 31
Multi-line 2
29 3 0 31
2
) twisted pair, shielded, <40 mΏ/m, min.
Wirings
Page 58 of 67