Epson PX-8 User Manual page 119

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