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E-4
A
PPENDIX
E: T
ECHNICAL
I
NFORMATION
The EIA-232 Interface
Your modem’s serial port is factory set to signal according to the EIA-232
standard. See Figure A-1, Signals at your Business Modem's Serial Port.
Wiring a DB-25 to
DB-9 Cable
DB-9 connectors for PCs should be wired at the computer end of the
cable as shown below.
Minimum
Requirements
Some computer/terminal equipment supports only a few of your
modem’s EIA-232 signals. The minimum required for your modem to
operate asynchronously follows:
DB-25 DB-9 Supports this signal
Pin Pin Function
2 3 Transmitted Data
3 2 Received Data
7 5 Signal Ground
20 4 Data Terminal Ready