OPA2-MOD(-H)
Doc: 70-00-0290, V1.0 R0, Date: 20160208
© Vector Controls GmbH, Switzerland
Page 1
Subject to alteration
Programmable operation terminal for MODBUS
OPA2-MOD
Features
LCD display with backlight four keys
Internal temperature sensor
With –H model, internal humidity sensor
1 external temperature input
2 digital inputs, which can be configured for window/door contacts
or motion detectors.
Up to 5 zones may be handled by one operation terminal
Detailed configuration possible
RS485 2-wire MODBUS standard in accordance to EIA/TIA 485
Slave type of communication
Galvanic isolated bus connection
Flush mounted on standard EU/UK/CH installation box
Application
The operation terminal controls typically a single room control unit. The device measures room temperature and humidity
(for –H type) through integrated sensors. Two additional digital inputs may be configured for window contact, key
switches or motion detectors. The operation mode may then be controlled based on these inputs. An external temperature
may be measured through the additional temperature input. This may be useful for underfloor heating, sensor averaging
for large rooms, outdoor temperatures etc.
The operation terminal communicates through a galvanically isolated RS485 interface via the MODBUS protocol in slave
mode.
Ordering
Model
Item# Display
RT
DI
rH
Description
OPA2-MOD
40-50 0014
yes
1
2
-
Modbus communication module with one internal
temperature sensor and one external temperature
input plus two binary inputs.
OPA2-MOD-H
40-50 0053
yes
1
2
1
As above with internal humidity sensor 3%
accuracy.
Supported Modbus commands:
-
03 (0x03): Read multiple registers
-
06 (0x06): Write single register
-
16 (0x10): Write multiple registers
Commands 03 and 16 can handle up to 32 registers. The Modbus slave transmits the values as signed 16 bit integers with
one digit below the decimal point. This results in the following range: -9999.9 to 9999.9
In an event of an out-of-range command addressing or an unsupported command, the Modbus slave responds with an
exception message according to the Modbus specification.
Dimensions [mm](in)
88 (3.5)
32
(1.2)
21
(0.8)
8
8
(
3
.5
)
5
8
(2
.3
)
