G4 Multi Channel Weighing Instrument. PM/DT/HE Technical Manual

G4 Multi Channel Weighing InstrumentException responsesWhen the master sends a query to a slave it expects a normal response(as described earlier). One of the following three events occurs after a queryfrom the master.1. Normal response.The slave has received the query without communication error and can handlethe query normally. The slave returns a normal response.2. Communication error.If the slave does not receive the query due to a communication error, or detectssome communication error (parity error or checksum error), no response is returned.The master should process a time-out for the query.3. Command error.If the slave receives the query without any communication error, but cannot handlethe query, e.g. if the command was not valid, the requested register number not validor instrument in a mode where the command was not allowed, then the slave willreturn an exception response informing the master of the nature of the error.The following exception codes are possible.Code NameDescription01 Illegal function Not a valid function code. Valid function codes are01, 02, 03, 05, 06, 08, 15, 16.02 Illegal data address Not a valid data address. See ‘Register description’for a list of allowed registers.03 Illegal data value Value in data query field not valid. To get a betterexplanation of the error, the ‘command error’ registercould be read.07 NegativeacknowledgementThe instrument has received the query but cannotperform it.To get a better explanation of the error,the ‘command error’ register could be read.6-27