ABB COMMANDER 300 Operating Instructions Manual

Also see for COMMANDER 300: Programming guide

Contents

8InstrumentIdentification(01 to 99)ParameterMnemonic(Section 8.6) BCC(optional)ReplyACKSign Data (up to 12 characters)…8 COMMUNICATION8.3 Reply Format – Figs 8.4 to 8.6The C300 Controller replies to the commandusing the reply format shown in Figs. 8.4 to8.6.8.3.1 TermClarification for Reply FormatInstrument Identification – two charactersidentifying the C200 Controller, 01 to 99.Data – usually up to six characters (includingdecimal point) showing the new parametervalue.However, up to 12 characters may be used ifidentifying the Alarm Relay Assignment, i.e.when using mnemonics Q1, Q2.Error Code – two-character mnemonic – seeSection 8.5.Reply – one ASCII control character (seeAppendix A1):‘ACK’ – command understood‘NAK’ – command not understood‘ETB’ – end of multiple read replyblock.Block Check Character (BCC) – one character,the arithmetic sum of the complete message(excluding parity bits), transmitted by thecontroller for error detection – see AppendixA3 on page 28.Fig. 8.4 Reply Format (Command Understood)InstrumentIdentification(01 to 99)ParameterMnemonic(Section 8.6) BCC(optional)ReplySign Data (up to 12 characters)ACKETBETBNote. This reply format may be repeated several times – see Example c) overleafThe last reply line is always:First replyReplies2 to nLast reply(n+1) ETBFig. 8.5 Multiple Read Reply FormatInstrumentIdentification(01 to 99) Error Code BCC(optional)ReplyNAKFig. 8.6 Reply Format (Command Not Understood)