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Switch 1 is not
used.
Switch 2 is for setting the format of a whole front panel Set-Up read out of the 1 050
(manually initiated read-out only). When set to logic 0, a semicolon ( ; ) will be used as a
Message Unit separator for the front panel set-up data read out of the 1050. When set
to logic 1, the front panel set-up data will be read out with LF (Line Feed) as a Message
Unit separator (as shown by an '*' in Fig. 5.2) i.e. each Message Unit will start on a new
line.
Switch 3 is for setting which Message terminator the 1050 reads out. When set to logic
1, the control character ETX with EOI is read out as the terminator. When set to logic 0,
LF (Line Feed) with EOI is the terminator read out. The 1050 recognises EOI with any
character, or LF as a terminator regardless of Switch 3 position.
On delivery, Address Switches A 5 to A 1 on the rear panel of the Type 1050 are set to
01001 (i.e. device address of decimal 9), switch 2 is set to "IEEE Format" and switch 3 is
set to "LF
A
EOI".
Note that after changing any of the switches, it is necessary to make a front panel Reset
0, or power off and then on again.
5.4. THE INTERFACE MESSAGE
For remote control of the 1050 over the IEEE interface bus, various interface Messages
can be specified, a list of which is given in Table 5.2 (a) and (b). Fig. 5.3 shows the 1050
front panel with the minimum Message header code relevant to the front panel functions.
A general diagram of the Message syntax is given in Fig. 5.2. The 'Header' describes the
task to be carried out. This consists of one word, or two or more words separated by an
underline ( _) (a hyphen (-) or a full stop (.) are also accepted by the 1 050 as word
separators). The words may be written in full or shortened to a minimum code, as long
as the first letter(s) of each word corresponds to the 'Min Code' in Table 5.2 (a) and (b).
Header
•
see text
Data
1---_.__-t
Fig. 5.2. General interface Message syntax diagram
Example:
COMPRESSOR_ SAFETY _LIMIT? or
COMP _SAF _LIM? or
C_S_L?
will give the same result.
86095511
37
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