TECSYSTEM MULTIMODULE 133 Instruction Manual page 4

TECSYSTEM S.r.l ®
2) MOUNTING
Mount the device on the board using the fixing hooks on the back of the housing to fix it on
the rail DIN EN50022.
This device is designed to be housed in the same board where NT133 monitoring device
is mounted.
3) SUPPLY
MULTIMODULE 133 must be fed with 24 VCA/CC ±10% voltage.
In case it is fed through a direct current source, any connection polarity must be
respected.
4) CONNECTION WITH NT133 MONITORING UNIT
To connect MULTIMODULE 133 module with NT133 monitoring units it is necessary to
2
use a 4-lead cable with section 0.5mm .
The serial cable must be placed as far as possible from power lines and the shielding
must be grounded on just one side.
The yellow led Rx NT-x stays fixed on if the serial communication line should be cut off or
wrongly connected.
The control software has a particular algorithm which is able to distinguish data corrupted
by possible noises.
In the event that the transmission line should be very disturbed, led Rx NT-x blinks.
In this case, you need to check the correct tightening of the terminal board screws as well
as the suited position of the cable.
5) LUMINOUS INDICATORS
The lighting of led ON near the supply connector signals the presence of 24 Volt supply
voltage.
Led Rx NT-x must be off in correct working conditions.
It turns on if the serial line should be cut off or wrongly connected.
If it blinks, it means that the serial transmission is disturbed by strong external interfer-
ences; therefore it is necessary to verify that the cable is shielded, grounded on just one
side and placed as far as possible from power lines or interference sources.
6) WORKING NOTES
For a correct working of ModBus it is necessary to load through SW1 and SW2 the RS485
network set-up parameters: address, baud rate, parity bit (Pages 17-18)
The serial communication between the temperature control monitoring unit and MULTI-
MODULE is active only when NT133 is in temperature control working mode in one of the
intended mode (Scan, Man and T.Max).
When other functions such as programming, programming display are activated, the
communication with the expanding is temporarily deactivated.
4
MULTIMODULE 133