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Si-Sensor
Victron RS485 to USB interface
Signal
-
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
(24/12, 24/24, 48/12 or 48/24) or
AC-DC adaptor must be utilised in the installation.
For 12 V battery banks/systems the IMT Si-RS485 series solar irradiance sensor range may be powered directly from the battery
bank and will continue to operate down to minimum voltage of 10.5 V (as measured at the sensor, account for voltage drop in the
cable).
For detailed wiring/installation notes and specifications refer to the
IMT Si-RS485 series solar irradiance sensor 'Quick Reference
Victron RS485 to USB interface cable ‘Datasheet’
.
To ensure signal integrity and robust operation, particularly ensure that;
• Extension cabling complies with the minimum cross-sectional area specifications in the related table - dependent on DC supply
voltage and cable length
• Extension cabling has appropriate shielding and twisted pair cores
• The original cable attached to the Victron RS485 to USB interface is reduced to a maximum length of 20cm in installations
where the total cable length is over 10m or there are installation/site specific interference issues – in this case appropriate/high
quality cabling should be used for the entire cable length, rather than only for the extension length
• Cabling is installed separated/away from the main DC or AC power cabling
• All wiring is properly terminated (including unused wires) and properly isolated from weather/water ingress
• The sensor housing is not opened or tampered with during installation - as sealing integrity will be compromised (and warranty
void)
The IMT Si-RS485TC series solar irradiance sensor includes internal Galvanic Isolation (up to 1000V) between power supply and
RS485 Modbus circuits, accordingly the non-isolated Victron RS485 to USB interface is suitable for most installations.
However, if an isolated RS485 to USB interface is preferred the only compatible device is
Hjelmslund Electronics USB485-
(any others type will not be recognised by the GX device).
Multiple Sensors
It is possible to connect multiple IMT Si-RS485 series solar irradiance sensors to a common Victron GX device, however a
dedicated Victron RS485 to USB interface is required for each individual unit.
Multiple units cannot be combined on a single interface (as this is not supported by the related Venus OS software).
Configuration
There is normally no need for any special/additional configuration – the default ‘as shipped’ configuration is compatible for
communication with a Victron GX device.
However, in cases where the IMT Si-RS485 series solar irradiance sensor has been previously used in another system and/or the
settings changed for any reason, it is necessary to restore the default configuration before further use.
To revise the configuration, download the
IMT 'Si-MODBUS-Configuration software tool'
. Follow the instructions in the
Modbus Configurator Documentation’
. and check/update the following settings:
• MODBUS Address: 1
• Baud Rate: 9600
• Data Format: 8N1 (10 Bit)
For further support related to configuration of the IMT Si-RS485 Series irradiance sensors please contact IMT Solar directly.
User Interface - GX Device
Upon connection to the Victron GX device and power up the IMT Si-RS485 Series irradiance sensor will be automatically
detected within a few minutes and appear in the 'Device List' menu.
Color Control GX Manual
Page 9
Installation