Since OpenDispense2 hasn't run for a long time, there is a chance that an error will pop up that it cannot deal with (most likely on the coke machine). Here's what to do when that happens:
On Martello:
/etc/init.d/vendserver stop
On Heathred:
/etc/init.d/dispsrv stop
Fire up minicom with the default config (9600bps, 8N1 on /dev/ttyS0) and try to talk to the coke machine. You should be greeted with the prompt ":" when you press enter. Enter "d7" (doesn't actually dispense anything). Enter "s" for good measure (it'll throw at you current slot names, which may be garbage, but don't worry, they'll be reset when dispense runs). Quit minicom with no reset (^B-Q) - do not eXit (with ^B-X). Then:
/etc/init.d/dispsrv start
Finally, on Martello:
/etc/init.d/vendserver start
