Xylem H-3531 FlashLite - Manual (Page 76)

B-4 Modbus Protocol
H-3531
B.4.8 Stage(RO)
This holding register holds the current measured stage in the desired units.
B.4.9 Pressure(RO)
This holding register holds the current measured pressure before any slope or offset is
applied, therefore it holds the raw psi value.
B.5.0 Temperature(RO)
This holding register holds the current measured temperature. This temperature reading is
the temperature of the internal pressure sensor and may not accurately reflect air
temperature.
B.5.1 Battery Voltage(RO)
This holding register holds the current input voltage.
Example Reading Holding Register Command:
Format: “aabbccccddddeeee”
Where: aa = 1 byte Modbus address
bb = 1 byte function code
cccc = 2 byte start address
dddd = 2 byte quantity of registers
eeee = 2 byte crc check
example: 010300010001xxxx
Example Writing Multiple Registers Command:
Format: “aabbccccddddeeffffgggg”
Where: aa = 1 byte Modbus address
bb = 1 byte function code
cccc = 2 byte start address
dddd = 2 byte quantity of registers
ee = byte count
ffff = 2 byte data value
gggg = 2 byte crc value
example: 01100001000120001xxxx