Gpib 488.1Protocol; Selecting The 488.1 Protocol - Keithley 2302 Instruction Manual

G-2 488.1 Protocol

GPIB 488.1protocol

The Models 2302/2302-PJ/2306/2306-PJ/2306-VS Power Supply supports two GPIB
protocols: SCPI and 488.1. The 488.1 protocol significantly increases 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.
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 below.

Selecting the 488.1 protocol

Perform the following steps to select the 488.1 protocol:
NOTE
When switching between the SCPI 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> Selects SCPI protocol
:SYSTem:MEP[:STATe] <0 or OFF>Selects 488.1 protocol
The following rules must be adhered to when sending this command with either parameter
setting:
1.
2.
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488.1 protocol is a bus only feature—no front panel support.
The command must be the only command on the line or it must be the last command in
the command string.
No command or query can be after this command on a line going to the power supply.