Delta OHM HD32MT.3, Operating Manual

Page: 10 / 62

HD32MT.3
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V1.2
3.1 D
ESCRIPTION OF TERMINAL BLOCK
In the bottom part, the case is equipped with M12 connectors that allow easy connection with
external sensors and accessories (for example, the external power supply unit). In case you
need to access the data logger terminal block, unscrew the 4 front screws securing the electronic
card protection panel and remove the panel.
Fig. 3.1: terminal block, jumpers and configuration dip-switches
1. Potential-free contact alarm output. The output is opto-isolated.
Terminal
number
Function
1 Alarm contact first pole
2 Alarm contact second pole
2. SDI-12 and auxiliary serial communication ports (COM AUX). The auxiliary serial port can
operate in RS232, RS485 or RS422 mode with proprietary protocol or in RS485 mode with
Modbus-RTU protocol (“Modbus Slave” mode).
Terminal
number
Function
3 SDI-12 data line.
RS422 RS485 RS232
4 Tx- DATA- Tx
5 Tx+ DATA+
6 Rx+ Rx
7 Rx-
8 GND GND GND