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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.

INPUTS

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.