Omron SYSMAC C200H-ASC02 Operation Manual page 120

Specifications
Transmission from the ASCII Unit to a Peripheral Device
The RTS signal is activated by the OPEN command. (The DTR signal goes HIGH or LOW depending on the
peripheral device which has been opened by the command.)
When the RTS signal goes HIGH, the status of both the CTS and DSR signals is checked, and then data is
transmitted.
ON
DTR (output) OFF
ON
RTS (output)
OFF
DSR (input)
CTS (input)
Data
Transmission from a Peripheral Device to the ASCII Unit
The DTR signal goes HIGH and the RTS signal goes LOW when the OPEN command is executed. (If the
DTR signal has already gone HIGH and the RTS signal has gone LOW, the state of these signals is main-
tained.)
The RTS signal goes HIGH when the INPUT command is executed and incoming data is received. (This oper-
ation is independent of the DSR and CTS signals.)
If the RTS signal is already HIGH when the OPEN command is executed, it will remain HIGH. The RTS signal
goes LOW when the CLOSE command is executed.
For LPRT, SCRN
Data transmission
OPEN PRINT
Note 1. If the DSR or CTS signal is disabled, these signals will be ignored. How-
ever, if the CTS signal to port 2 needs to be disabled, either pull it HIGH
or connect it to the RTS signal. If the RTS signal is selected as the valid
signal by the OPEN command, the RTS signal will remain HIGH. The
RTS signal goes low when the CLOSE command is executed.
2. If the name of the peripheral device in the OPEN command is TERM or
COMU, when the OPEN command is executed, the DTR signal will go
HIGH and the RTS signal will go LOW. The RTS signal will go HIGH when
the PRINT command is executed. If both the CTS and DSR signals are
HIGH, data will then be transferred.
3. If the name of the peripheral device in the OPEN command is LPRT or
SCRN, when the OPEN command is executed, both the DTR and RTS
signals will go LOW. The RTS signal will go HIGH when the PRINT com-
mand is executed. If both the CTS and DSR signals are HIGH, data will
then be transferred.
For TERM, COMU
Data transmission
Appendix B
For
Port 1
For
Port 2
CLOSE
END
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