Introduction - Keithley SourceMeter 2400 User Manual
Sourcemeter 2400 series source measure unit
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Also See for SourceMeter 2400:
- Service manual (137 pages) ,
- Quick start manual (46 pages) ,
- Quick results manual (53 pages)
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G-2
GPIB 488.1 Protocol
Introduction
The SourceMeter supports two GPIB protocols: SCPI and 488.1. The 488.1 protocol 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
SourceMeter (command messages) and up to 20 times for data returned by the Source-
Meter (response messages). The speed of readings sent over the GPIB is also increased;
see
"GPIB reading speed comparisons," page
NOTE
With the 488.1 protocol selected, you will still use SCPI commands to program
the SourceMeter. Operation differences between the two protocols are discussed
in this appendix.
Selecting the 488.1 protocol
Perform the following steps to select the 488.1 protocol:
1.
Press MENU to display the MAIN MENU.
2.
Place the cursor on COMMUNICATION and press ENTER to display the
COMMUNICATIONS SETUP menu.
3.
Place the cursor on GPIB and press ENTER to display the present GPIB address.
4.
Press ENTER to display the GPIB PROTOCOL menu.
5.
Place the cursor on 488.1 and press ENTER.
6.
Use the EXIT key to back out of the menu structure.
When switching between the SCPI protocol and 488.1 protocol, the instrument does not
reset. The GPIB protocol setting is saved in EEPROM, and the unit will power up with
that selected protocol.
The GPIB protocol cannot be changed over the bus. However, there is a query command to
determine the presently selected protocol. When the 488.1 protocol is selected, the mes-
sage exchange protocol (MEP) disables. Therefore, if you use the following query to
request the state of MEP, you will know which protocol is enabled:
:SYSTem:MEP[:STATe]?
If a "1" is returned, MEP is enabled, and the SCPI protocol is selected. A "0" indicates
that MEP is disabled, and the 488.1 protocol is enabled. To summarize:
1 = SCPI protocol
0 = 488.1 protocol
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®
2400 Series SourceMeter
User's Manual
G-6, for details.
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