User manual

Table Of Contents
Flash card
Figure 3-7: Rev C Flash Card
IMPORTANT
For reliability, McLane strongly recommends using only type SDP3B SanDisk FlashDisk
PCMCIA ATA flash cards.
The middle circuit board in the controller stack is a TattleTale 8 (TT8v2) micro-
controller manufactured by Onset Computer Corporation (www.onsetcomp.com). The TT8v2 is
a single board computer with large and varied I/O capacity that supervises the operation of the
MMP hardware.
The bottom circuit board is the motherboard of the MMP, which supports interface ports
for peripheral components, a power distribution network, and an independent system watchdog
circuit. The watchdog chip is shown in the MMP Controller Electronics schematic in Figure 3-6.
The super capacitor that provides the watchdog with a temporary (several days) independent
power source is located on the underside of the motherboard. The watchdog is described in more
detail in Chapter 7, “MMP User Interface” and Appendix B, “System Architecture”.
Edge Connectors
Peripheral components like the motor and sensors connect to the controller through the
black edge connectors indicated and labeled in Figure 3-6. The connectors are also labeled on the
motherboard. Each edge connector has a unique number of pins and is keyed to prevent
accidental misconnection by the operator. The harness connectors lock in position when they are
fully inserted.
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