Yokogawa 212 Heat Calculator - Manual (Page 39)

4.3.4 Function Codes
The Model 212 accepts the following function codes:
Code Name Description
03 Read data register(s) Obtain the content of one or
more 2 byte data registers.
06 Preset data register Preset one 2 byte data register.
07 Read status register Obtain the content of 1 byte
status register.
16 Preset data register(s) Preset one or more 2 byte data
registers.
4.3.5 Exception Response
The Model 212 forms an exception response by adding 80H to the function code
and using an exception code as the 1 byte data field in the returned frame.
Implemented exception codes are as follows:
Code Name Description
01 Illegal function The function code is not a
legal action for the slave.
02 Illegal data address The data address is not a legal
address for the slave.
03 Illegal data value The data value is not a legal
value for the slave.
Communications 37