Serial communications, Microsoft activesync, External serial devices – Hand Held Products 7900 User Manual
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Serial Communications
The GPS module sends data to serial COM port 1 of the terminal. The default data rate is 4800 bps, which is non-configurable.
Microsoft ActiveSync
Because data from the GPS module is sent to the 7900 via the I/O connector, serial ActiveSync and other external serial RS-232
device input connections are not possible when the GPS module is powered on. However, USB ActiveSync is available at all
times.
If you need to use serial RS-232 ActiveSync or other external serial RS-232 devices, you will have to remove power from the
GPS module. Because the GPS module is powered by the I/O connector, you need to disable the power out setting of that
connector; see
If the GPS module is powered on and an external RS-232 device is connected, transmitter contention occurs
External Serial Devices
Because data from the GPS module is sent to the 7900 via the I/O connector, contention will occur if you connect a serial input
device to the 7900 while the GPS module is powered on. Therefore, if you want to connect to a serial input device to the 7900,
disable the power out to the GPS module in the