6
RIRST Resets a remote inhibit (INH). The external remote inhibit signal opens all
RLY controls and turns off all outputs. RIRST returns the outputs and RLY
controls to their previously programmed state. If the remote inhibit signal is
still true when the RIRST command is programmed, the outputs remain off
and the RLY controls remain open.
The meaning of the following standard power supply programming command has been changed to permit
programming the supply with Option 750.
OUT < ch > < on/off > Programs both the output and RLY control for the specified output channel
(ch). For on/off = 1, the RLY control is first closed and then the output is
turned on after a 20ms delay. For on/off = 0, the output is turned off and the
RLY control is opened after a 20ms delay. Having the output off when the
RLY control changes state extends the life of the external relay.
Note This change to the OUT command also applies to the operation of the front panel OUTPUT
ON/OFF function key.
Operating Examples
The FLT/INH/RLY circuits can be used in a variety of applications as shown by the following examples.
INH Example
As shown in Figure 4, an external, normally open switch (S1) is connected to the INH input. This switch could
be attached to a hinged protection hood, which covers the power supply output terminals. When the hood is
lifted and the switch closes, the following action is taken by the supply:
1. The power supply outputs turn off and the RLY controls open.
2. The INH bit in the status and accumulated status registers is set true.
3. If the INH bit in the mask register has been unmasked, the INH bit in the fault register as well as the FAU
bit in the serial poll register will also be set true.
In this example, the computer would be made aware that a fault exists during a serial poll via the FAU bit in the
serial poll register. Merely closing the hood does not re-enable the supply. To re-enable the supply, first read
the fault register to reset the FLT line and INH bit. Then either send RIRST to restore the output of the supply
to the programmed values that were in effect before the supply was disabled, or send CLR to initialize the
supply to its power-on state (See Table 5-3 in Operating Manual). Note that the on/off state of the outputs and
RLY controls is determined by the DCPON command.
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