Multitech MultiModem rCell - RS232 9-Pin Functions of the Female End Connector

Chapter 1 – Product Overview
MultiModem rCell User Guide 25
RS232 9-Pin Functions of the Female End Connector
The following table explains the pin functions.
External Power
Serial Cable
Female Connector
Signal IN/OUT
Pin 1 CD O
Pin 2 RX O
Pin 3 TX I
Pin 4 DTR I
Pin 5 GND --
Pin 6 DSR* O
Pin 7 RTS I
Pin 8 CTS O
Pin 9 RI O
Note: The DSR signal on pin 6 is always asserted by the router.