Superintend IMD
© Copyright Muuntosähkö Oy - Trafox
7
RS-485 NETWORK CONNECTION
The IM-04DCCT unit includes a RS-485 bus connection with Modbus RTU protocol for
remote monitoring and controlling.
The IM-04DCCT unit functions as a slave device. A unique address must be set for it
(SETUP
→
MB Addr).
The RS-485 bus must form an uninterrupted chain, which is open at both ends, and
contains no branches. Thus, a maximum of two RS-485 cables are installed in any unit:
in other words, an incoming and an outgoing cable. A terminator is installed in the first
and the last unit. If the IM-04DCCT unit is the first or last device of the bus, an external
terminating resistor of 120 Ω must be connected
between the terminals A and B. In all
other units, the terminator must not be installed.
The cable shield is connected to the SH terminal of the IM-04DCCT unit.
SYSTEM CONFIGURATION
The most sensible configuration order for the settings is as follows:
•
Set the correct time (SETUP
→
Time).
•
Set the alarm parameters (SETUP
→
InsLimit, PrInsLim, StDelay).
•
When needed, set the Modbus address (SETUP
→
MB Addr).
•
If needed, enable the automatic alarm acknowledgement (SETUP
→
AutoRst).
A more detailed description of the co
nfiguration is provided in the Manual section “SETUP
menu”.
