Connecting Imt Solar Irradiance, Temperature And Wind Speed Sensors - Victron energy Color Control GX Manual

5.9. Connecting IMT Solar Irradiance, Temperature and Wind Speed Sensors

Ingenieurbüro Mencke & Tegtmeyer GmbH (IMT) offer a range of digital silicon irradiance sensor models within the
series that are all compatible with a Victron GX device.
Compatibility
The optional/additional external module
Optional/additional external sensors are either connected to the solar irradiance sensor with pre-installed plugs or pre-wired
to the solar irradiance sensor (external module and ambient temperature only). When external sensors are connected via an
appropriate solar irradiance sensor, all measurement data is transmitted to the Victron GX device with the single interface cable.
Each model solar irradiance sensor within Si-RS485 series has a different capability with regards to external sensors (or comes
with an external sensor pre-wired), so carefully consider any future desires/requirements before initial purchase.
It is also possible to connect an independent
Ta-ext-RS485-MB ambient temperature sensor
irradiance sensor or in addition to one.
Operation
The IMT Si-RS485 series solar irradiance sensors operate using RS485 electrical interface and Modbus RTU communication
protocol.
The Victron GX device must be running version 2.40 or later.
The IMT sensor needs to be firmware version 1.52 minimum - for more information about this please contact IMT.
Physical connection to the Victron GX device is via USB port and requires a Victron RS485 to USB interface cable.
A suitable external DC power source (12 to 28 VDC) is also required - the sensor is NOT powered via USB.
Wiring Connections
The schematic in the installation guide below depicts the wiring configuration in a typical installation.
Wire connections
Si-Sensor Victron RS485 to USB interface
Brown Orange
Orange Yellow
Red -
Black
Black (thick) -
- Red
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Color Control GX Manual
temperature, ambient temperature
IMT Tm-RS485-MB module temperature sensor
(visible as 'external temperature') directly to the Victron GX device, without a solar
Signal
RS485 Data A +
RS485 Data B -
Power Pos - 12 to 28VDC
Power Neg/Gnd - 0VDC
Ground / Cable Shield / PE
Power Pos - 5VDC (not used)
and wind speed sensors are also supported.
(visible as 'cell temperature') or
Connecting supported non-Victron
Si-RS485
IMT
products