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8-12 SYSTEM FUNCTIONS
The Parallel Port
ZephyrExpress’ parallel port has five contact-closure outputs and four logic or contact-
closure inputs. Voltages and connection details are in Section 3, Hardware.
Parallel Port
PIN FUNCTION PIN FUNCTION
1 Ground 9 N/C
2 Output 2 10 Output 0
3 Status Out 11 Output 1
4 Output 3 12 N/C
5 N/C 13 Input 2
6 Input 3 14 Input 1
7 Input 0/Panic Dial 15 N/C
8 +5 volts 400 ma max.
One of the five outputs, pin 3, is used to report successful connections. Use the Codec:
Status Out
menu item to set this pin to go active low when the receive decoder is locked,
or when either or both lines are connected.
One of the four inputs, pin 7, can be used to initiate “Panic Dial” and call a particular
number when it’s pulled low. Use the ISDN: Panic dial menu item to specify an autodial
setup, which can also include a master setup that configures the codec or other menus.
If no Panic Dial setup is specified, the input can be used for ancillary data.
i
ISDN TIP!
Panic Dial calls stay connected only while pin 7 is low. When pin 7 is lifted from
ground, the call is dropped.