GX Touch 50 Wall Mount Manual

Table Of Contents
The IMT Si-RS485 series solar irradiance sensors operate using RS485 electrical interface and Modbus RTU communication
protocol.
The required interface software is pre-installed within the Venus OS, however the Victron GX device must be running recent
firmware - FW v2.40 is the minimum requirement.
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 Signal
Brown Orange RS485 Data A +
Orange Yellow RS485 Data B -
Red - Power Pos - 12 to 28 VDC
Black Power Neg/Gnd - 0 VDC
Black (thick) - Ground / Cable Shield / PE
- Red Power Pos - 5 VDC (not used)
- Black Power Neg/Gnd - 0 VDC (not used)
Brown Terminator 1 - 120R (not used)
Green Terminator 2 - 120R (not used)
Installation Notes
The maximum DC power supply voltage permitted for the IMT Si-RS485 series solar irradiance sensor range is 28.0 VDC -
accordingly for 24 V and 48 V battery banks/systems an appropriate Victron DC-DC converter (24/12, 24/24, 48/12 or 48/24) or
AC-DC adaptor must be utilised in the installation.
Cerbo GX Manual
Page 9 Installation