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CHPA S
ERIES
3.5 External Interlocks Interface
The External Interlocks Interface allows the user to connect the CHPA to external safety
interlocks; this interface features two signals: External Interlock Non-Latching and External
Interlock Latching. External Interlock Non-Latching is RF Inhibit; this command is always
executed. External Interlock Latching is a user-induced fault and, unlike other faults, is not
recycled. These commands are executed by opening the command pin from its return.
The CHPA External Interlocks Interface is located at connector J8 on the rear panel of the
CHPA. It is a 9-pin D-type connector, with pin assignments as shown in Table 3-4.
Table 3-4. Interlocks Interface Pin Assignments (J8)
Pin #
Signal Name
1
External Interlock
(latching beam off)
2
External Interlock
Latching
3
External Interlock
Non-Latching
4
External Interlock
Note: A jumper is factory-installed on this port. When using the External
Interlock Interface, this jumper is not required.
3-6
Figure 3-2. Setting Serial Format
Remarks
Open from Return (pin 2) for External Interlock Fault Latching
Latching Return
Open from Return (pin 4) for External RF Inhibit
Non-Latching Return
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D
.01023245 R
.R
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