The 9 pin serial port, dosen;t always have all the "lines" that are in the 15 pin. (obviously) normally ya need Tx, RX RTS, CTS. You need to find out exactly what lines are needed. Make sure via metering that they are all there. Also it may need to cross-over ie: Tx goes to Rx and Rx goes to Tx. Try using a Null Modem. OR try a USB to 9 pin Din serial adapter.
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