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NOTE: Connectors
are removable
INH FLT
. . . .
+
-
+
A) INH Example with One Unit
In example A, the INH input connects to a switch that shorts the Inhibit pin (+) to common whenever it
is necessary to disable output of the unit. This activates the remote inhibit (RI) circuit, which turns off
the dc output. The front panel Prot annunciator comes on and the RI bit is set in the Questionable Status
Event register. To re-enable the unit, first open the connection between pins INH + and common and then
clear the protection circuit. This can be done either from the front panel or over the HP-IB/RS-232.
In example B, the FLT output of one unit is connected to the INH input of another unit. A fault
condition in one of the units will disable all of them without intervention either by the controller or
external circuitry. The controller can be made aware of the fault via a service request (SRQ) generated by
the Questionable Status summary bit. Note that the FLT output can also be used to drive an external relay
circuit or signal other devices whenever a user-definable fault occurs.
Digital I/O Connections
As shown in Table 3-3 and Figure 3-7, the FLT/INH connector can also be configured as a digital I/O
port. Information on programming the digital I/O port is found in chapter 5 and under
[SOURce:]DIGital:DATA and [SOURce:]DIGital:FUNCtion commands in chapter 8. The electrical
characteristics of the digital connector are described in appendix A.
PIN
1
2
3
4
4 3 2 1
Switch
(Normally
Open)
INH Input
INH Common
Figure 3-6. FLT/INH Examples
Table 3-3. FLT/INH DIGital I/O Connector
FAULT/INHIBIT
FLT Output
FLT Common
INH Input
INH Common
4 3 2 1
INH
FLT
. . . .
+
-
+
INH
Input
4 3 2 1
INH
Input
B) FLT Example with Multiple Units
DIGITAL I/O
Output 0
Output 1
Input/Output 2
Common
Installation - 3
FLT
Output
FLT
Output
25
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