Sierra Wireless DART 200 CDPD Modem - Manual (Page 126)

DART 200 CDPD Modem User’s Guide C Charts and Diagrams
Sierra Wireless, Inc. C-2
The pin functions for pins labeled in Figure C-2 are listed in Table C-1
Table C-1. Pin functions
Pin Number Name Function Direction
1 DCD Carrier Detect To DTE
2 RXD Receive Data To DTE
3 TXD Transmit Data From DTE
4 DTR Data Terminal
Ready From DTE
5 GND Signal Ground Both
6 DSR Data Set Ready To DTE
7 RTS Request to Send From DTE
8 CTS Clear to Send To DTE
Table C-2 lists the RS-232 signal interference specifications.
Table C-2. RS-232 signal interface
Direction Logical
Condition Voltage Level Load Status
Input (From DTE) One -3 to -25 VDC 5K Ohm OFF, Mark
Zero +3 to +25 VDC 5K Ohm ON, Space
Output (To DTE) One -5 to -8 VDC 3K Ohm OFF, Mark
Zero +5 to +8 VDC 3K Ohm ON, Space