Series 2000 Communications Handbook - Soliton

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EI-Bisynch ProtocolSeries 2000 Communications HandbookIf there is no reply at all to a write request, one of the following errors is possible:• Incorrect wiring or faulty hardware (Cable, PC, RS422/485 adaptor, Instrument CommsModule)• Instrument Address set wrong (PC, Instrument)• Wrong Line setup, should be 7 data bits, even parity, 1 stop (PC)• Baud rate set wrongly (PC, Instrument)• Parity error detected by instrument (Suspect line noise)• Incorrect message format (PC)To determine the cause of any communications problems, work systematically through thepossible causes.Example of a Parameter WriteFor example, when writing a value of 22.0 to the setpoint to an instrument at address 1, thefollowing sequence of characters will be sent and received:Master: [EOT]0011[STX]SL22.0[ETX]{BCC}Instrument: [ACK]Note that the BCC is a single character, that in this case has a value of 32 hex.In hexadecimal, the transaction is as follows:Master: 04 30 30 31 31 02 53 4C 32 32 2E 30 03 02Instrument: 064.5. BROADCASTSA particular GID (group identifier) and UID (unit identifier) address is reserved for use inbroadcast messages; the tilde character ‘~’, hex 7E, can be used as a wild card in the GIDand/or UID to selectively broadcast to all or to specific groups of instruments. In this case, noreply to the write request will be sent by any instrument. The only foolproof method ofdetermining whether the write has succeeded is therefore to read back the parameter fromeach instrument and verify that it is set correctly. Broadcast is only recommended forsystems where failure to communicate a value due to physical failure of wiring or otherequipment will not cause damage to equipment.4-10 Series 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00
Series 2000 Communications HandbookEI-Bisynch Protocol4.6. ERROR CODES HELD IN EEThe special ‘EE’ mnemonic may be used to give the status of the last communicationstransaction. It is a hex format parameter, and the values it may contain are as follows:0: No Error1: Invalid Mnemonic2: Parameter is read only7: Incorrect message8: Limit error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eries 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00 4-11
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ASCII CodesSeries 2000 Communicatio
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Series 2000 Communications Handbook - Soliton

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