User`s manual

NexSens Technology, Inc.
iSIC User‟s Manual 35
2.3 Modbus RTU
NexSens iSIC data loggers support Modbus RTU sensors connected to a data logger via RS232 or
RS485.
Implementation:
 RS232 and RS485, baud rates 1200 to 57600 supported.
 Addresses from 1 to 247 are supported.
 Registers 0 to 65535 are supported. The software assumes each parameter is in
sequential register order. When registers are not in sequential order, the modbus device
can be added as multiple sensors.
 Commands 0x03 for reading holding registers and 0x04 for reading input registers are
supported.
 User specified timeout available.
 Data types of 2-byte Integer, 4-byte Integer (big-endian), 4-byte IEEE Float (big-
endian), 4-byte Integer (little-endian), and 4-byte IEEE Float (little-endian) are available.