Selecting The 488.1 Protocol - Keithley 2303 User Manual

D-2 Models 2303 and 2303B GPIB 488.1 Protocol
Introduction
The Models 2303 and 2303B Power Supply support 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 for data sent to the power supply
(command messages) and for data returned by the power supply (response messages). The
speed of readings sent over the GPIB is also increased. Factory default is SCPI protocol.
NOTE

Selecting the 488.1 protocol

Perform the following steps to select the 488.1 protocol:
1.
2.
3.
4.
5.
NOTE
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 until changed again.
The GPIB protocol can be changed over the bus. 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
Send the following commands over the GPIB to change the GPIB protocol between SCPI
and 488.1:
:SYSTem:MEP[:STATe] <1 or ON>
:SYSTem:MEP[:STATe] <0 or OFF> Selects 488.1 protocol
With the 488.1 protocol selected, you will still use SCPI commands to program the
power supply. Operation differences between the two protocols are discussed in this
Appendix.
Press MENU to display the MAIN MENU.
Use the or keys to select GPIB MENU, and then press ENTER to display it.
Use the or keys to display PROTOCOL, and press ENTER to display the present
PROTOCOL setting.
Use the or keys to display 488.1, and press ENTER to select for 488.1 protocol.
Use the MENU key to back out of the menu structure.
To select SCPI protocol use the or
ENTER.
keys in Step 4 to display SCPI before pressing
Selects SCPI protocol