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| Serial Cable Connections for the H3600 Here are the connections you need to make to connect a USB cradle to a serial cable to form a null-modem connection. In a null-modem connection, the transmitted data from one device is connected to the receive data pin of the other device, and vice versa. Inside the USB cradle, there are two connectors, CON1 and CON2. CON1 is the external connector that mates with the port on the bottom of the iPAQ handheld. CON2 is connected to the USB cable. Because the USB data are on different pins from the RS232 data, both a serial cable and a USB cable can be connected at the same time. Pin 1 of CON2 is indicated by a small triangle that points to it. Connections DB9 Female H3600 Cradle Pin Name CON1 Pins CON2 Pin Name 1 Data Carrier Detect (DCD) 3 6 DTR 2 Receive Data (RXD) 7 4 TXD 3 Transmitted Data (TXD) 8 5 RXD 4 Data Terminal Ready (DTR) 9 7 DCD 5, case GND 4, 10, case 9 GND 6 Data Set Ready (DSR) 3 1 7 Request to Send (RTS) 5 2 CTS 8 Clear to Send (CTS) 1, 6 3 RTS 9 Ring Indicator (RI) NC NC NC References A description of RS232: http://www.rad.com/networks/1995/rs232/rs232.htm Jim Pick's description of his serial cable adapter: http://www.handhelds.org/pipermail/handhelds/2000-July/000643.html Acknowledgments Thanks to Jim Pick and Scott Herndon for sending me the CON2 pinout and correcting my CON1 pinout. Modified August 2, 2000 by [email protected] |
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