Contrec 515 BR03, Operation Manual

Page: 88 / 110

Communications
78 515 BR03 - 15 August 2021
Function Codes
The instrument accepts the following function codes:
Exception Response
The instrument 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
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.
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.
05 Acknowledge The slave has accepted the request and is
processing it, but a long duration of time
will be required to do so.
06 Slave device busy The slave is engaged in processing a long
duration program command. The master
should re-transmit the message later when
the slave is free.