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A CR6 or CR1000X data logger programmed as a Modbus Master can retrieve the values stored
in the CS240DMCS240 and CS240DM Input Registers
the CRBasic program requires a
instruction.
The
instruction has the following syntax:
SerialOpen
SerialOpen
(ComPort, Baud, Format, TXDelay, BufferSize, Mode )
The Format is typically set to logic 1 low; even parity, one stop bit, 8 data bits. The Mode
parameter should configure the ComPort as RS-485 half-duplex, transparent.
The
ModbusMaster()
ModbusMaster
(Result,ComPort,Baud,Addr,Function, Variable, Start, Length, Tries,
TimeOut, [ModbusOption] )
The Addr parameter must match the CS240DM Modbus address. Each Modbus address must be
unique on a Modbus network. The default value for the Modbus address is the last two digits of
the sensor serial number, with exceptions for serial numbers ending in 00 and 01. These
exceptions default to Modbus addresses of 110 and 111, respectively. To collect all of the
CS240DM values, the Start parameter needs to be 1 and the Length parameter needs to be 5.
ModbusOption is an optional parameter described in the CRBasic Editor Help.
7.3 Placement on a photovoltaic (PV)
module
The PV module may or may not have distinctive photocells. If the PV module does not have
distinctive photocells, centre the sensor on the back of the PV module. If the module has several
distinctive photocells, centre the sensor on the back of the photocell that is the middle of the PV
module.
7.4 Mounting/cable strain relief
CAUTION:
Before mounting, the installers need to wash their hands and then clean the back of the PV
module or other device with ethyl alcohol.
CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature
SerialOpen()
instruction has the following syntax:
(Modbus register map
instruction followed by the
(p. 18)). To do this,
ModbusMaster()
Sensors 13
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