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 Devices:
 serial.device
  AbortIO
  BeginIO
  CMD_CLEAR
  CMD_FLUSH
  CMD_READ
  CMD_RESET
  CMD_START
  CMD_STOP
  CMD_WRITE
  CloseDevice
  OpenDevice
  SDCMD_BREAK
  SDCMD_QUERY
  SDCMD_SETPARAMS
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Docs » Autodocs » serial.device » SDCMD_QUERY

NAME

       Query -- query serial port/line status

FUNCTION

       This command return the status of the serial port lines and
registers. The number of unread bytes in the serial device's
read buffer is shown in io_Actual.
The break send & received flags are cleared by a query, and
whenever a read IORequest is returned with a error
in io_Error.
IO REQUEST
io_Message mn_ReplyPort initialized
io_Device preset by OpenDevice
io_Unit preset by OpenDevice
io_Command SDCMD_QUERY

RESULT

       io_Status        BIT  ACTIVE  FUNCTION
LSB 0 --- reserved
1 --- reserved
2 high parallel "sel" on the A1000
On the A500 & A2000, "sel" is also
connected to the serial port's
"Ring Indicator". Be cautious when
making cables.
3 low Data Set Ready
4 low Clear To Send
5 low Carrier Detect
6 low Ready To Send
7 low Data Terminal Ready
MSB 8 high hardware overrun
9 high break sent (most recent output)
10 high break received (as latest input)
11 high transmit x-OFFed
12 high receive x-OFFed
13-15 --- reserved
io_Actual set to count of unread input characters
io_Error -- Query will always succeded.

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