Xantrex Technology XHR, XFR, XFR3 manual Address the unit devname or device name as

Installation and Configuration

Remote/Local Operation

While in remote mode, you can change to local mode operation by pressing the front panel LOCAL button, by sending the GPIB GTL (Go to Local) command, or by negating the GPIB REN (Remote Enable) line. You can disable the LOCAL button by enabling the GPIB Local Lockout (LLO) condition. For an example of how to use LLO, see “Setting Local Lockout”.

To return to remote mode, ensure that the REN line is asserted and then send any valid GPIB or device-dependent command. Since the remote mode output settings may be different from the local mode settings, the output is programmed to protect the load by turning off when you toggle from local to remote mode during a session. Check your remote settings and then send OUT ON to restore the output.

Local Mode In local mode operation, you set the voltage and current output levels and the OVP Operation trip level with controls located on the front panel. Refer to the operating manual for

a description of the functions available at the front panel.

While in local mode operation, you can change power supply control to remote mode by ensuring that the GPIB REN line is asserted and then sending any software command to get into remote mode and the OUT ON command to restore the output. You can return to local mode by pressing the front panel LOCAL button, unless Local Lockout is in effect. If LLO is in effect, use the GPIB GTL command to send the power supply into local mode, or negate the REN line to turn off LLO and return the power supply to local mode.

Example:
ibfind "devname"	Address the unit (devname or device name as
	configured originally with ibconf).
ibloc	Set unit to local mode.
ibwrt"id?"	Any message to the unit now puts it back to
	remote mode.
ibloc	Toggle back to local mode.

Setting Local Use the GPIB Local Lockout command to disable the front panel LOCAL switch. Lockout With LLO in effect, you cannot return to local control by pressing the front panel LOCAL switch. You can still return to local mode by sending the GTL command.

To turn off LLO and return the power supply to local mode, negate the REN line. The LLO condition can only be removed by negating the asserted REN line.

Example:
ibfind GPIB0	Address the computer controller
ibsic	Put the controller in charge by sending an Interface
	Clear.
ibsre1	Assert the Remote Enable line.

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