I want to use serial port to commnucation between pc and hb34970. In gpib mode, it is ok. But in serial mode, report error. just like this: for setting com2: 16:11:47.359 2009-8-26 [Init_dq_Device]error:-1073807339--HP34970A Initialize.vi->Init_DQ_Device.vi->main_app.vi VISA read.visa name:ASRL2::INSTR for setting com1:16:13:25.921 2009-8-26 [Init_dq_Device]error:-1073807339--HP34970A Initialize.vi->Init_DQ_Device.vi->main_app.vi VISA read.visa name:ASRL1::INSTR I don't know the meaning of -1073807339 and whether i should set:ASRL1::INSTR for com1. Anyone can help me about this problem. Thanks very much. attach my subvi.

MMM,I think you might want to check your cable again. Serial cables come it two types, Straight (patch) or Null. This is because serial devices may be either DCE (Data Communications Equipment) or DTE (Data Terminal Equipment.) You have proved the cable is good by using it with another peice of equipment but, you haven't proved that it is the right TYPE of cable frompg 273 of the manual you need a null modem cable the instrument is DTE Check the 34790A user manual. You also need to set-up the 34790A to expect RS232. From the front panel you have to access the interface menu and select RS-232 and configure the port settings. Have you done this? Make sure the port settings match yourPC com port settings Another very common set-up issue is to connect to the trigger/alarm interface by mistake. The serial port is the lower 9 pin connector on the 34790As rear panel

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How to resolve the serial communication error in HP34970?

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How to resolve the serial communication error in HP34970?

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