Model 6485 Picoammeter Instruction Manual IEEE-488 and SCPI Conformance Information G-3
GPIB 488.1 Protocol
The Model 6485 supports two GPIB protocols: SCPI (488.2) and 488.1. The 488.1 proto-
col is included to significantly increase speed over the GPIB.
When using the 488.1 protocol, throughput is enhanced up to 10 times for data sent to the
6485 (command messages) and up to 20 times for data returned by the Picoammeter
(response messages). The speed of readings sent over the GPIB is also increased.
NOTE With the 488.1 protocol selected, you will still use SCPI commands to program
the 6485. Operation differences between the two protocols are discussed in this
appendix.
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
(23)
Macro information.
Response to *IDN (identification).
Storage area for *PUD and *PUD?
Resource description for *RDT and *RDT?
Effects of *RST, *RCL and *SAV.
*TST information.
Status register structure.
Sequential or overlapped commands.
Operation complete messages.
Not applicable.
See Common Commands in
Section 12.
Not applicable.
Not applicable.
See Common Commands in
Section 12.
See Common Commands in
Section 12.
See Status Structure in Section 11.
All are sequential except :INIT
which is overlapped.
*OPC, *OPC? and *WAI; see
Common Commands in
Section 12.
Table G-2
Coupled commands
Sending Changes To
CALC2:NULL:ACQ
TRAC:POIN <n>
TRAC:CLE
CALC2:NULL:OFFS <n>
TRAC:FEED:CONT <name>
TRAC:FEED:CONT <name> TRAC:CLE
Acquired value
NEV
NEV
Table G-1 (continued)
IEEE-488 documentation requirements
Requirements Description or reference
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