03
Read Holding
Registers
Read content of read /write location ( 4X )
04
Read input
Registers
Read content of read only location ( 3X )
16
Presets Multiple
Registers
Set the content of read / write locations ( 4X )
Exception Cases :
An exception code will be generated
when Current Transducer receives ModBus query with valid
parity & error check but which contains some other error (
e.g. Attempt to set floating point variable to an invalid value )
The response generated will be “Function code” ORed with
HEX (80H ).The exception codes are listed below
Communication Baud Rate is user selectable from the
front panel between 2400, 4800, 9600, 19200 bps.
The each byte in RTU mode has following format
Format of
Data
Bytes
Error
Checking
Bytes
Byte
format
4 bytes (32 bits) per parameter.
Floating point format ( to IEEE 754) Most
significant byte first (Alternative least
significant byte first)
8-bit binary, hexadecimal 0-9, A-F 2
hexadecimal characters contained in each 8-
bit field of the message
2 byte Cyclical Redundancy Check (CRC)
1 start bit,
8 data bits, least significant bit sent first
1 bit for even/odd parity
1 stop bit if parity is used; 1 or 2 bits if no
Function code
39
Summary of Contents for RISH CON - I
Page 1: ...IC 15001063 REV C 17 12 13 Operating Manual I Programmable Current Transducer RISH CON I...
Page 2: ......
Page 59: ...5 6 7 8 1 2 3 4 Input I Aux Output 1 Output 2 Optional 57...
Page 61: ...Notes 59...
Page 62: ...Notes 60...
Page 64: ...Notes 62...
