Series 2000 Communications Handbook - Soliton

EI-Bisynch ProtocolSeries 2000 Communications Handbook4. CHAPTER 4 EI-BISYNCH PROTOCOL6JKU EJCRVGT KPVTQFWEGU VJG RTKPEKRNGU QH VJG '+$KU[PEJ EQOOWPKECVKQP RTQVQEQN EI-Bisynch is a proprietary protocol based on the ANSI X3.28-2.5 A4 standard for messageframing. Despite its name, it is an ASCII based asynchronous protocol. Data is transferredusing 7 data bits, even parity, 1 stop bit.4.1. EXPLANATION OF TERMS4.1.1. AddressEach instrument has a configurable address consisting of two digits, the fist being a ‘group’number 0 to 9, and the second a ‘unit number 0 to 9. There are, in principle, therefore 100different addresses that may be used, 00 to 99, although in Series 2000 instruments, address00 is reserved for use in configuration mode, leaving addresses 01 to 99 available.The address is set on the , )O6, using the 5 parameter. It may be necessary to use9)) user interface via the )O6 to view and change the value of this parameter;see the instrument manual for more information.4.1.2. MnemonicsEI-Bisynch identifies parameters within an instrument using what are known as ‘mnemonics’.These are usually two letter abbreviations for a given parameter, for example PV for ProcessVariable, OP for Output, SP for Setpoint, and so on. Tables giving the mnemonics forparameters used in the 2000 Series is provided in Chapter 5.4.1.3. ChannelsEI-Bisynch provides for ‘channel’ data. This would be used, for example, when a singlephysical unit contains several independent control loops, each having their own ProcessVariable, Setpoint, and Output Power. In this case, the values for each loop are obtained byspecifying different channel numbers: ‘1’, ‘2’, etc.The 2000 series supports an optional channel number of ‘1’, since it is a single loopcontroller. Other channel numbers will be rejected as invalid, with the exception of channel‘9’ which has a specialised function described elsewhere in this manual.The channel number, if used, is encoded as a single ASCII character preceding themnemonic, for example 1PV.4-2 Series 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00