EKO INSTRUMENTS CO., LTD. - Pyranometer MS-80/80S/80U - Instruction Manual Ver. 1
Pg. 23
3. Digital output (Modbus / SDI-12)
The MS-80S can work in two digital output modes, respectively Modbus 485 RTU and SDI-12. Modbus 485 output
is set to default, the SDI-12 output can be selected through the Hibi software.
PC connection (Modbus)
For any converter with screw terminals or open wires, connect the 4 wires of the sensor cable with the corresponding
wire color to the RS-485 to USB converter (figure 5-10). Some converter cables provide a 5V supply voltage from
the USB port, in such case no additional power supply is required. In any other case use an additional power supply.
Connect the power terminals to a DC power supply [8 to 30 V]. We recommend to use a fuse [0.5A] to the DC power
supply line [+] for over current protection.
* For stable communication, please connect the
the power supply and the GND of RS485/USB converter.
Depending on the converter type and design properties, some commercial RS-485 to USB
converters may not work properly. A termination resistor is required to prevent reflections from
the end of the transmission line. Pull-up and pull-down resistors are necessary to keep the voltage
level constant when the transmission line is in a high impedance state.
EKO can provide an optional and approved USB converter for connection with a PC. The converter
cable is needed for setup , sensor diagnostics and data logging through the Hibi software.
Depending on your region, the optional converter can be different.
Fig. 5-10. How to connect MS-80S (Modbus RS485)
Brown
White
*
Blue
Black
Shield
Power supply
DC5V, or 8 to 30V
TR+ / A
TR- / B
RS485/USB
Converter
+
Fuse [0.5A]
PC
GND
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