ILX Lightwave FPM-8200, User Manual

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G P I B C O M M A N D R E F E R E N C E
GPIB Command Reference
01_10 FPM-8200
63
C H A P T E R
4

Action Requests the value in the status byte register.
Response
Notes Response is the sum of the enabled bits.
See Chapter Three for more information about register structure.
Example *STB?˙Response 200 means the status byte condition and master status summary bits, and error
message bits, are enabled. (8 + 64 + 128 = 200)
Action Defines the message terminator.
Values 0 =<CR><NL><^END>FPM−8200 default
1 = <CR><NL>
2 = <CR><^END>
3 = <CR>
4 = <NL><^END>IEEE−488 Standard
5 = <NL>
6 = <^END>
Notes All other settings than TERM 4 are technically out of compliance with IEEE 488 specifications.
However they are provided for flexible compatibility with various GPIB drivers.
The FPM−8200 default is compatible with IEEE−488 compliant instruments because <
CR
> is
ignored as white space.
TERM 3 will often cause "bus hang" problems, because IEEE−488 compliant instruments ignore the
<CR> as white space, causing them to wait indefinitely for message termination.
Meanings of the acronyms are historical:
CR = Carriage Return (e.g.: a mechanical typewriter)
NL = New Line (e.g.: line−feed on a "line printer")
^END = EOI code (End Or Identify)
Example Term 4˙Define the message terminator as the IEEE−488 standard: <NL><^END>
*STB?
Status Byte?
C
OMMON
D
EVICE
D
EPENDENT
F
RONT
P
ANEL
TERM <nrf value>
Terminator
C
OMMON
D
EVICE
D
EPENDENT
F
RONT
P
ANEL
Numeric
Value:
Operation complete
Query error
Device dependent error
Execution error
Command error
Power ON
= Unused bits
1
4
8
16
32
128