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SECTION 4
GHB
Interface
4.3.9
Service Request (SRQ)
Reset SRQ:
Issue
SRQ:
l
After reading status by performing
a serial poll
l
After receiving the inquiry message for reading status
("?ST" )
l
When an SRQ is issued, SRQ is sent in the following
cases:
When the device clear command is received. (DCL or
SDC command)
l
When one measurement
is completed
in the manual
trigger mode
l
When the zero correction of OPEN or SHORT is com-
pleted
4.3.10
Status Byte
The status byte sent in response to serial polling and in-
quiry messages is defined by Table 4-6 as follows.
Table 4-6.
Status Byte
Rit
I Chntent
1 Condition to be set (1)
1 Condition to be reset
(1)
---
- --__ ----
__- ______
--_ _- - - --_ .-,
7
Always zero
MSB
6
RQS
When issuing the SRQ command
When receiving the device clear command"
After reading the status byte.**
5
ERR
Zero correction error
When receiving the device clear command
(Correction value is too large.)
After reading the status byte
When the zero correction is normally per-
formed.
4
BUSY
Under measurement
Under non-measurement
(Zero correction included)
3
Zero
End of zero correction of OPEN or SHORT
When receiving the device clear command
(Abnormal end included)
After reading the status byte
When starting zero correction
2
Always zero
1
Always zero
0
Always zero
LSB
*Device clear: DCL or SDC command
**Status byte read: Reading of the status byte by the inquiry message "?ST" or serial poll performed when issuing the SRQ command.
(Reset is not performed by the serial poll when the SRQ command is not issued.)
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4-11
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