Basic Principles of Serial Data Transmission
2.6 Data transmission with the printer driver
PtP coupling and configuration of CP 340
60 Manual, 04/2011, A5E00369892-03
BUSY signal
The CP 340 evaluates the printer's "BUSY" control signal. The printer indicates to the CP
340 that it is ready to receive:
● CP 340-20mA-TTY: current on RxD line
● CP 340–RS 232C and CP 340-RS 422/485: CTS signal = "ON".
Note
When RTS/CTS flow control is parameterized, you must set the polarity of the BUSY
signal on the printer as follows:
BUSY signal: CTS = "OFF"
Please note that some printers use the DTR signal to display the BUSY signal. In such
cases you must wire the cable to the CP 340 appropriately.
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