VI_ATTR_ASRL_WIRE_MODE
Resource Classes
Serial INSTR
Attribute Information
| Access Privilege | Data Type | Range | Default |
|---|---|---|---|
|
Read/Write |
ViInt16 |
VI_ASRL_WIRE_485_4 (0) |
N/A |
Description
VI_ATTR_ASRL_WIRE_MODE represents the current wire/transceiver mode.
For RS-485 hardware, this attribute is valid only with the RS-485 serial driver developed by National Instruments.
For RS-232 hardware, the values RS232/DCE and RS232/AUTO are valid only with RS-232 serial drivers developed by National Instruments and documented to support this feature with the corresponding National Instruments hardware. When this feature is not supported, RS232/DTE is the only valid value.
RS-232 settings:
- VI_ASRL_WIRE_232_DTE uses DTE mode.
- VI_ASRL_WIRE_232_DCE uses DCE mode.
- VI_ASRL_WIRE_232_AUTO automatically detects which mode to use.
RS-485 settings:
- VI_ASRL_WIRE_485_4 uses 4-wire mode.
- VI_ASRL_WIRE_485_2_DTR_ECHO uses 2-wire DTR mode controlled with echo.
- VI_ASRL_WIRE_485_2_DTR_CTRL uses 2-wire DTR mode controlled without echo.
- VI_ASRL_WIRE_485_2_AUTO uses 2-wire auto mode controlled with TXRDY.
 |
Note This attribute is valid only on the platforms on which National Instruments supports its RS-232 or RS-485 products. |
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