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 parity
Byte format
Communication Baud Rate is user selectable from the front panel
between 2400, 4800, 9600, 19200 bps.
Function code :
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
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
01 Illegal function The function code is not supported by
Transducer.
Power
02 Illegal Data
Address
Attempt to access an invalid address or an
attempt to read or write part of a floating point value
03 Illegal Data
Value
Attempt to set a floating point variable to
an invalid value
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Summary of Contents for 30P
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