ABB Zenith ZTG 30 Operation, Maintenance And Installation Manual page 63

5.6.1.1 LED indications
The following table illustrates the possi-
ble signals, and their meaning:
LED Indication
Power LED, Off
green
On fixed
On, with two
quick
flashes per
second
RX and TX Off
LEDs,
green
On, flashing
rapidly
—
Table 5.6 Indication / Ekip Com Modbus RTU -module
—
Fig. 5.12 Signals of Ekip Com Modbus RTU -module
Description
Power supply absent.
Power supply and
communication with
the device present.
Power supply present,
and communication
with device absent.
Modbus RTU
communication not
active.
Modbus RTU
communication active.
5.6.1.2 Termination resistor
On the Ekip Com Modbus RTU module it is
possible to activate the terminating resis-
tance Rterm = 120 Ω. To enable the Rterm,
the corresponding dip-switches 1 and 2
(on the side of the module) must be posi-
tioned to ON. This option must be se-
lected before the installation of the
module.
With the Ekip Com Modbus RTU
modules, the dip-switches 3 and 4 of the
Rpol (polarization resistance), are not
used.
ON IA
1 2 3 4
Rterm Rpol
120Ω
on
off
—
Fig. 5.13 Termination resistor; To enable the Rterm, the
dip-switches 1 and 2 must be positioned to ON. This option
must be selected before the installation of the module
63
on
off