RSINST
is
the entry point for the subroutine which checks whether any charac-
ters have been received.
Return Parameters
Register A
OOH
No
data
received
Register A
=
FFH
Data
received
Entry Point: WBOOT
+ 42H
RSOUTST
is
the entry point for the subroutine which checks whether trans-
mission
is
enabled.
Return Parameters
Register A
OOH
Transmission disabled
Register A
=
FFH
Transmission enabled
Entry Point: WBOOT
+ 45H
RSIN
is
the entry point for the subroutine which receives one character. When
the receive buffer
is
empty, it waits until
data
is
received.
Return Parameter
Register A = Character received
Z Flag = OlH Normal completion
Z Flag =
OOH
CTRL-STOP was used to terminate transmission.
'4-1·'li.
Entry Point: WBOOT + 48H
RSOUT
is
the entry point for the subroutine which outputs a charactc:r via the
RS232C interface.
Entry parameter
Register C = ASCII code
of
character to be sent.
Z Flag OlH Normal completion
Z Flag =
OOH
I
CTRL
I - I
STOP
I was used to terminate transmission.
Buffer address and size are as specified by the user with the RSOPEN routine.
5-22
NOTE:
RSOPEN
must
be called to open the RS232C
port
before
RSIN
or
RSOUT
is
called.
';"1['8'
Entry Point: WBOOT + 51H
RSIOX
is
the entry point for the subroutine which determines the
I/O
configu-
ration via the RS-232C interface
and
opens
or
closes the interface. The func-
tions
of
this subroutine are explained below.
RSIOX (OPEN)
Function: Opens the RS232C interface
Entry parameters
Register B = lOH
Register
HL=
Parameter block address
The contents
of
the parameter block are shown below.
IHL)-
Buffer
Address
12B)
Receive
Buffer
t
Buffer
Size
12B)
Bit
Rate
19
- 9FH, 1
B)
~
9FH
=
19200
9EH
=
9600
Bit/CHAR
(1B)
9DH =
4800
OCH=
2400
1'---
Parity
11B)
,./1--
9AH =
1200
STOP
Bit
(1B)
8
=
800
I
Special Para. (1B)
6 =
300
4
=
150
~=
2
2 =
110
7 Bit/Chara.
= 3 8 Bit/Chara.
81
H =
75/1200
(Tx/Rx)
89H =
1200/75
ITx/Rx)
~=O
No
Parity
Normally
set
to
9FFH.
= 1 Odd Parity
L......
6543
2
1 0
= 3
Even Parity
t
LDTRON
~=1
RTS ON
1
bit
--
= 3 2
bit
5-23
'I.,
_____________
_
I
j
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