3-14 ZEPHYREXPRESS HARDWARE
RS-232 Pinouts
PIN FUNCTION
2Rx (Computer to ZephyrExpress)
3Tx (ZephyrExpress to Computer)
4DTR (ZephyrExpress ready output)
5Ground
hHOT 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
NFUNCTION PIN FUNCTION
1Ground 9N/C
2Output 2 10 Output 0
3Status Out 11 Output 1
4Output 3 12 N/C
5N/C 13 Input 2
6Input 3 14 Input 1
7Input 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.