[App_rpt-users] App_rpt-users Digest, Vol 51, Issue 9
bill.hurlock at cpcomms.com
Fri May 10 16:54:55 EDT 2013
Here is a clip about PIN 4 in the Accessory plug of a GM300.
4 Programmable Output Only This is a radio output port. It is an open collector output which saturates to A+ supply when active. It is normally used to drive an external relay or sense lead. It duplicates the function of J3-3 of the five pin logic board. When active it can source a maximum current of 250 mA.
The pin has a 10 K ohm resistor pull-down to ground on the logic board. and uses a PNP transistor to switch it up to 12V. This pin does not work as an active low pin (i.e. pulling something to ground), only as an active high (that is dragging something up to +12v). If you want an active high output to drive a reed relay which has the other side of the coil to ground, this is your pin (but don't forget to check that the backwards diode is present on the coil pins).
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