12.7 Watchdog Timer
J9 may be used to connect an external watchdog timer circuit to the CPU. For watchdog timer programming information, see page 18 and the ZFx86 Training Manual included in the Documents folder of the
1
2
3
Ground
Watchdog In
Watchdog Out
J9 Pinout
12.8 Installation
The panel board includes a hardware kit containing spacers of various sizes along with screws and nuts. There are three sizes of spacers: 7mm (0.276”), 14mm (0.551”), and 0.600”. All hardware for assembling the stack and mounting it to the enclosure front panel is
The Pandora enclosure includes an additional hardware kit of
The panel board connects to the following headers on the
J3 Main I/O
J4 Ethernet
J5 USB
J6 Watchdog timer
J11 Input power
J14 Data acquisition
To install the panel board onto the
Insert the four 7mm male/female hex spacers into the holes on top of the panel board and fix them in place with the four 14mm female/female hex spacers below. Then plug the panel board onto the connectors of the CPU board, being careful to align all the connectors properly. Note that there are mating connectors on all 4 edges of the board for the
When the boards are properly mated, the
The board stack may be mounted inside the Pandora enclosure in one of two ways. The stack may “hang” from the front panel, or it may be mounted to both the front and rear panel. The assembly drawings included with the Pandora enclosure show both options. The stack mounts to the front panel with four #4 flat head screws that install onto the four spacers on the top of the panel board as well as 14 #4 screwlocks that connect to the 7 Dsub connectors on the panel board.
Finally select one of the two options for fixing the bottom of the stack. Either install four #4 pan head screws on the bottom of the CPU board into the four spacers between it and the panel board, or attach the four 0.6” male/female round PC/104 spacers on the bottom of the board and then install four #4 flat head screws through the case’s rear panel into the PC/104 spacers.
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