Series 2000 Communications Handbook - Soliton

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EI-Bisynch ProtocolSeries 2000 Communications Handbook4.1.5. Control charactersSeveral ASCII control characters are used in the framing of EI-Bisynch messages. These are:HexValueNameUsage02 STX Start of data in a message03 ETX End of message04 EOT End of transmission sequence05 ENQ Enquiry for a value06 ACK Positive Acknowledge15 NAK Negative Acknowledge4.2. DATA FORMATSData in Bisynch messages is sent as a sequence of ASCII printable characters. Two principaldata formats are used in Series 2000 instruments, Free format, and hex format. See alsoChapter 6 .4.2.1. Free Data FormatParameter values returned from the instrument in ‘free format’ are of variable length. Theinstrument returns the value as it would be displayed on its front panel, with no leading ortrailing spaces, e.g:-99.9123.4123 (integer value)Note that trailing decimal point characters are suppressed. Any ‘sign’ must precede thenumber itself.Values written to the instrument may contain leading and trailing spaces, leading or trailingzeros, or sign indications.4-4 Series 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00
Series 2000 Communications HandbookEI-Bisynch ProtocolThis format is used for almost all parameters available over EI-Bisync in the 2000 series, withthe exception of a few status words and prime set parameters which use ‘hex format’.NB: Because the returned value is of variable length, it is necessary to use the terminatingETX character to delimit the data value. It is not usually possible to make assumptionsregarding the number of characters used to represent a value unless you are operating in avery restricted numeric range, 10.0 to 99.9 for example, where all possible values will take4 characters to transmit.4.2.2. Hex Data FormatThis format is used for a few status words and prime set parameters. The value is preceded bya ‘>‘ (hex 3E) character, and normally consists of 4 hexadecimal characters, although it isacceptable to suppress leading zeroes when parameters are written. These characters representthe value of a 16 bit unsigned integer in hexadecimal (base 16) notation. Upper or lower caserepresentations of ‘A’ to ‘F’ are acceptable, although the instrument will always return uppercase. For example>2040 equivalent to 8256 decimal>ABCD equivalent to 43981 decimalThis format is also used in conjunction with the channel 9 specifier to set up instrument scrolllists. More information on this operation is given later in this manual.Series 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00 4-5
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Series 2000 Communications Handbook - Soliton

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