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3-14 ZEPHYREXPRESS HARDWARE
RS-232 Pinouts
PIN FUNCTION
2 Rx (Computer to ZephyrExpress)
3 Tx (ZephyrExpress to Computer)
4 DTR (ZephyrExpress ready output)
5 Ground
h
HOT TIP!
This port is configured as DTE, not DCE. This means pins 2 and 3 are wired like a
computer instead of as a modem. You can plug in a standard modem, set for
auto-answer, to remotely control ZephyrExpress for automated remote
broadcasting. If you want to connect directly to a computer, you’ll need a null
modem (a molded plug/jack with crossed wires, available from computer stores)
or will want to cross pins 3 and 4 in the cable.
Parallel Port
The parallel port functions are not available as of ZephyrExpress software version 1.2.1. If
you’re using a subsequent update that supports the parallel port, here’s how it’s wired:
Parallel Port
PI
N
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.
Inputs
All parallel port inputs are wired to accept either a voltage (up to +24 DC) or a closure to
ground. Ground closures can be through switches or either pulled-up or open-collector
logic outputs.