Signallings; Termination Resistor - ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions

Signallings

B
Termination resistor The modules provide the possibility to insert a 120 Ω termination resistor on the RS-485 bus,
194 | © 2013 ABB | 1SDH001000R0002 - L7804
The following table illustrates the possible signals, and their meaning:
Pos. Description
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
A
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).
RX and TX LEDs, green. The possible states are:
B • Off: Modbus RTU communication not active.
• On, flashing rapidly: Modbus RTU communication active.
A
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).
Figure 88
Electronic accessories | 6 - Ekip Com Modbus RS-485 modules
ABB | SACE Emax 2
1 2 3 4
ON