Wavetek 75 - Page 54

Table 3-2. Programming Reference Guide (Continued)
Serial Poll Byto
weightsAA
"Carrier Lost Programming Error
(RSV) Request for Service
Execute Complete
"Framing Error Return Complete
Function
"Overrun Low Battery
"RS-232-C only
ASCII
Character
SRQ Mode
Description
Number
Character
Talk Mode
0-9, E, +,
- , and
decimal.
Each bit enables the associated condition to cause a service request. Each con-
dition may be enabled individually or in combination with others. The RSV bit is
always enabled.
Examples:
'XQO' disables the SRQ line.
'XQI' asserts the SRQ line and RSV bit when there is a program error
such as "offset" beyond the Model 75 limits.
'XQ9' initiates a service request if either a program error has occurred
or the battery voltage is detected low.
The numeric characters '0' through '9', 'E', ' + ', I-', and decimal point are
used to program new parameter values. Data entry is free format,
i.e., fixed
point, floating point and exponential notation, or scientific notation.
To read a message from the Model 75, send the talk address (with ATN on) over
the bus. The instrument will then send the message currently selected by
theTalk
Mode(XT) setting. The last character of the Model 75's message will be the cur-
rently programmed terminator character with the EOI line asserted.
The characters 'XT' followed by a
code(0 through 7)selects the kind of message
the 75 will send when it is addressed as a talker on the GPIB.
CODE MESSAGE
XTO Programming error list. A typical error string is E 1 F 2AD. Some error string
characteristics are:
All error strings begin with 'E'.
Most recent error is at the end of the string.
Errors are separated by space.
Class 1 error: The number "1
" followed by the programming character
that caused the error (example 1 F).
Class 2 errors: The number
"2" followed by the two conflicting
parameters.
Class
3 errors: Start, stop, sync conflict.
Error strings can be up to 80 characters in length.
After transfer, the instrument clears the error string.
Scans by ArtekMedia O 2006