Table of Contents
Advertisement
Serial Utilities and Programming
parity
Valid parity options are:-
N =None
S =Space M =Mark
[PE]
The PE option must be specified if Basic is to check
parity for each data byte received, the default is no
parity checking. If it detects a parity error then a
"Device I/O Error" is reported.
Framing and overrun errors ALWAYS cause a "Device
I/O Error".
data
The number of data bits per byte sent. Valid options
are:- 5, 6, 7 or 8. Note if 8 data bits are specified then
the None parity option must be used.
stop
Number of stop bits. Valid options are 1, 1.5, or 2.
Handshake lines.
Serial ports have up to 6 handshake lines, there are 2
OUTPUT handshake line and 6 INPUT handshake lines.
Output Handshake Lines - DTR and RTS.
DTR:
BASIC always sets DTR out true during the
OPEN"COM.. statement.
RTS:
The level of the RTS line will be set true unless it is
suppressed by the RS option in the OPEN"COM
statement.
Input Handshake Lines CTS, DSR, DCD and RI.
CTS:
Basic expects CTS to be true during OPEN"COM else
the open fails. Disable CTS checking with the CS0
option.
DSR:
Basic expects DSR to be true during OPEN"COM else
the open fails. Disable DSR checking with the DS0
option.
Chapter 5 Page 60
AT & OPTO DUAL RS422/485
E =Even
O =Odd
Advertisement
Table of Contents
