Table of Contents
Advertisement
8.3 Reply Format – Figs 8.4 to 8.6
The ZMT Analyzer replies to the command using the reply
format shown in Figs. 8.4 to 8.6.
8.3.1 Term Clarification for Reply Format
Instrument Identification – two characters identifying the
ZMT Analyzer, 1 to 99.
Data – usually up to six characters (including decimal point)
showing the new parameter value.
Error Code – two-character mnemonic – see Section 8.6.
Reply – one ASCII control character (see Appendix A1):
'ACK'
–
command understood
'NAK'
–
command not understood
'ETB'
–
end of multiple read reply block.
Instrument
Identification
(1 to 99)
Instrument
Identification
(1 to 99)
First reply
Note. This reply format may be repeated several times – see Example c) overleaf
Replies
2 to n
The last reply line is always:
Last reply
(n+1)
Parameter
Mnemonic
(Section 8.6)
Sign
Fig. 8.4 Reply Format (Command Understood)
Parameter
Mnemonic
(Section 8.6)
Sign
Fig. 8.5 Multiple Read Reply Format
Instrument
Identification
(1 to 99)
Error Code
Fig. 8.6 Reply Format (Command Not Understood)
8 COMMUNICATION...
Block Check Character (BCC) – one character, the
arithmetic sum of the complete message (excluding parity
bits), transmitted by the analyzer for error detection
– see Appendix A3.
Data (up to 6 characters)
Reply
ACK
Data (up to 6 characters)
ETB
ETB
ETB
BCC
(optional)
Reply
NAK
BCC
(optional)
Reply
BCC
(optional)
ACK
7
Advertisement
Table of Contents
