Article # 59, added by Geoworks, historical record
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OmniGo Serial flow control
Here is some important information about the OmniGo 100 serial port's hardware flow control lines. The only pins connected are Tx (transmit) Rx (receive) RTS (request to send) CTS (clear to send) The following pins are not connected and can not be used for flow control DTR (data terminal ready) DSR (data set ready) RI (ring) CD (carrier detect) DTR is wired to digitizer, messing with it will blank screen. DSR is wired to the battery indicator. On the OmniGo, the built-in serial port is COM 1 and the PCMCIA serial port is COM 4. Q. Can I use hardware flow control on the OmniGo? A. Yes and no. Yes you can use RTS/CTS, but you cannot use DTR. On the OmniGo, DTR is always high, but when the transceiver isn't powered on, the external DTR pin isn't driven. Since the pin is floating, it will most likely appear as neither HIGH nor LOW. Q. How do I know if data has been received at a serial port? Is there an explicit message sent? or do I have to poll using SerialQuery()? A. You can set up a message for serial event notification. See the SDK_C\Serial2 sample application.