Radio Shack TRS-80 Model III - Page 85

OPERATION
$RSINIT
—
90/X005A'
Initialize the RS-232-C Interface
When
you
start
the
Computer,
the
RS-232-C interface
is
initialized
to the
following characteristics:
Send/Receive
Baud Rate: 300
Word length:
8
Parity: None
Stop-Bits:
One
Wait for completion
of
character
I/O
To change any of these
,
you
must
call
SRSINIT
.
Entry Conditions
(16888):
(16890)=
(16889)=
Bits
5,6
Send/Receive Baud
Rate
Code:
Most
significant
four
bits
=
send rate
Least
significant
four
bits
=
receive rate
See the table ofbaud rate
codes in Chapter 8.
Wait/Don't Wait Switch
Zero
=
"Don't Wait"
Non-Zero
=
"Wait"
RS-232-C Characteristics Switch:
Meaning
Bits
Parity:
3
I
=
Even
=
Odd
Word
Length:
2
00
=
5
Bits
01
=
6 Bits
10
=
7 Bits
II
=
8
Bits
Stop
Bits:
=
1
Bit
1
=
2 Bits
Parity On/Off
=
Parity
1
=
No Parity
Meaning
Transmit On/Off.
=
Disable
1
=
Enable
Data Terminal Ready
=
No
1
=
Yes
Request To Send
=
No
l=Yes
75