Remote Operation
Manual 31470, Rev. E, April 2001
3-111
3.19.12
Sensor Selection
Six simple commands (consisting of one of six function codes) specify how the sensors are used:
Syntax
:
[AP BP AR BR AD BD]
Examples
:
OUTPUT 713;AP
! Measure sensor A
OUTPUT 713;BP
! Measure sensor B
OUTPUT 713;AR
! Measure A divided by B
OUTPUT 713;BR
! Measure B divided by A
OUTPUT 713;AD
! Measure A less B
OUTPUT 713;BD
! Measure B less A
These commands, like the prefixes AE and BE, are sensor-specific, and cause the 8650A to assume that
subsequent commands are intended for the same sensor unless they specify otherwise. Also, these
commands (like the MN0, CR0, and PH0 command) have the effect of disabling Min/Max monitoring,
Crest Factor, and Peak Hold.
3.19.13
Status
Status Byte Message
The power meter responds to a Serial Poll Enable (SPE) bus command by sending an 8-bit byte when
addressed to talk. If the instrument is holding the SRQ bus control line true (issuing the Require Service
message), bit position 6 in the Status Byte and the bit representing the condition causing the Require
Service message to be issued will both be true. The bits in the Status Byte are latched, but can be cleared
by sending the Clear Status (CS) program code.
The condition indicated in Bits 1-5 must be enabled by the Service Request Mask to cause a Service
Request Condition. The mask is set with the @1 program code followed by an 8-bit byte, or the *SRE
program code followed by three ASCII characters. The value of the byte is determined by summing the
weight of each bit to be checked (the three ASCII characters are the value of the byte in decimal). The
RQS (bit 6) is true when any of the conditions of bits 1-5 are enabled and occur. Bits remain set until
the Status Byte is cleared.
Table 3-16: Status Byte and Service Request Mark
Bit
Weight
Service Request Condition
7
128
Over/Under Limit
6
64
RQS bit Require Service
5
32
Event Status
4
16
MAV
3
8
Measurement or Cal Zero Error
2
4
Entry Error
1
2
Cal/Zero Complete
0
1
Data Ready
Summary of Contents for 8650A Series
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