5 serial poll status byte, Serial poll status byte, Remote interface reference – American Magnetics 135 & 136 Liquid Helium Level Instruments (CE-Marked) User Manual
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Rev. 3
Remote Interface Reference
Serial Poll Status Byte
4.2.5
Serial Poll Status Byte
The IEEE-488 serial poll status byte (spoll byte) can be used to obtain
information about the state of the instrument. Bit 7 of the status byte is
reserved for SRQ. The remaining bits are used to provide custom
information as shown in the table below.
Note
The fill mode indication is only accurate if the fill toggle switch on
the front panel is in the AUTO position. There is no remote
indication or control available for the OPEN or CLOSED manual
override selections.
Bit
ON
OFF
1 (LSB)
HI relay on
HI relay off
2
A relay on
A relay off
3
B relay on
B relay off
4
LO relay on
LO relay off
5
Fill mode on
(controller output energized)
Fill mode off
(controller output de-
energized)
6
Data ready for this unit
No data available
7
Service Request (SRQ)
No SRQ
8
Not used
Not used
0RGHO
0RGHO
0RGHO