RSIOX tPUT)
Function: Sends one byte
of
data.
Entry parameters
Register B = 60H
Register C = Send data
Register
HL=
Address
of
the block which
is
used
to
store return information
Return parameters
Z flag = 1 Normal completion
Register
HL=
Refer
to
the
OPEN
function.
Z flag = 0 Abnormal end
Register A = 03H Interface not open
A =
OOH
CTRL-STOP was pressed
The contents
of
register
HL
is
not changed.
RSIOX (CTLIN)
Function: Reads the status
of
the control line.
Entry parameter
Register B = 70H
Return parameters
Z flag = 1 Normal completion
Register A shows the conditions
of
the control line flags as follows:
DCD status
DRS status
Z flag =
OOH
Abnormal end
Register A = 03H Interface not open
5-26
RSIOX (SETCTL)
Function: Sets the control lines.
Entry parameters
Register B =
SOH
Register C = Data
to
be set
BIT 0 = DTR (H for
"1"
and L for
"0")
BIT 1 = RTS (H
for"
1"
and L for
"0")
Return parameters
Z flag = 1 Normal completion
Z flag = 0 Abnormal end
Register A = 3 Interface not open
RSIOX (ERSTS)
\
Function: Checks the error status and clears the error flags.
Entry parameter
Register B = 90H
Return parameters
Z flag = 1 Normal completion
Register A contains the conditions
of
the control line flags
Receive buffer overflow
DCD status
Parity error
Receive overrun
Framing error
DSR status
Z flag =
OOH
Abnormal end
Register A = 03H Interface not open
RSIOX (SENS)
Function: Checks the status
of
the RS232C interface.
5-27
To Next Page
Loading...
