5686G-PRO User Guide
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Copyright © 2018 USR, a Division of UNICOM Global
Serial Ports
Most computers provide a DB-25 or DB-9 port that conforms to the EIA-232 standard.
The EIA-232 Interface
Your modem’s serial port is factory set to signal according to the EIA -232 standard.
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.