ABB | SACE Emax 2
194 | © 2013
ABB |
1SDH001000R0002 - L7804
Electronic accessories | 6 - Ekip Com Modbus RS-485 modules
Signallings
B
A
The following table illustrates the possible signals, and their meaning:
Pos.
Description
A
Power status LED, green. The possible states are:
• Off: power supply absent.
• On fixed: power supply and communication with the release present (with a
release with the Alive LED option disabled).
• On, with one flash per second (synchronized with that of the green LED on the
release): power supply and communication with release present (with a release
with the Alive LED option enabled).
• On, with two quick flashes per second (not synchronized with those of the
green LED on the release): power supply present, and communication with
release absent (for example, because Local Bus disabled).
B
RX and TX LEDs, green. The possible states are:
• Off: Modbus RTU communication not active.
• On, flashing rapidly: Modbus RTU communication active.
Termination resistor
The modules provide the possibility to insert a 120
Ω
termination resistor on the RS-485 bus,
by setting the dip-switches
Rterm
on the side of the modules, in position
on
. This option must
be selected before the installation of the modules.
For the positions
on
and
off
of the dip-switches
Rterm
, see the following figure (on Modbus
RS-485 communication modules, the dip-switches
Rpol
are not used).
ON
1 2 3 4
Figure 88