Omron C500-ASC04, Operation Manual, Page: 63 / 154

52
The following three tables define the communication parameters for the OPEN
Statement.
Peripheral Device Name Output from
ASCII Unit
Input to ASCII
Unit
Terminal TERM: YES YES
Keyboard KYBD: NO YES
Display SCRN: YES NO
Printer LPRT: YES NO
RS-232C device COMU: YES YES
Note TERM cannot be used with port 2.
Communication
Specifications
Character Length Parity Stop Bit
0 7 bits Even 2 bits
1 7 bits Odd 2 bits
2 7 bits Even 1 bit
3 7 bits Odd 1 bit
4 8 bits None 2 bits
5 8 bits None 1 bit
6 8 bits Even 1 bit
7 8 bits Odd 1 bit
Signal Line CTS DSR RTS XON / XOFF
0 Valid Valid Valid Invalid
1 Valid Valid Invalid
2 Valid Invalid Valid
3 Valid Invalid Invalid
4 Invalid Valid Valid
5 Invalid Valid Invalid
6 Invalid Invalid Valid
7 Invalid Invalid Invalid
8 Valid Valid Valid Valid
9 Valid Valid Invalid
A Valid Invalid Valid
B Valid Invalid Invalid
C Invalid Valid Valid
D Invalid Valid Invalid
E Invalid Invalid Valid
F Invalid Invalid Invalid
Note To make the CTS signal invalid at port 2, pull the CTS line high or connect it to the
RTS line.
When the RTS is specified to be ON (valid), the RTS signal goes high when the
port is opened and remains high until the port is closed. When the RTS signal is
specified to be OFF (invalid), the RTS signal remains low unless an I/O state-
ment such as PRINT or INPUT is executed.
If XON is designated, the XOFF code will be transmitted and the ASCII Unit will
request the interruption of transmission when the buffer is 3/4 full at the time of
data reception. The XON code will be transmitted and the ASCII Unit will request
the restart of transmission if the buffer becomes 1/4 full. Data transmission will
be interrupted if the XOFF code is received and data transmission will restart
when the XON code is received. If XOFF is designated, control is not possible.
This means, if the buffer is full, no more data can be received.
Commands, Statements, and Functions Section 4-2