CP340/CP341/CP440/CP441 Communication and Programming
Entry-ID: 88867653, V1.0, 02/2014
6. Double-click the envelop icon under Protocol to configure ASCII communication
parameters. The set communication parameters shall be the same as those of the
communication partner. Communication Baud rate: 9600bps，Data bit: 8 bits,
Stop bit: 1 bit, Parity: none, Character delay time: 4ms, Other parameters shall be
in default settings.
Fig. 7: Distributing communication parameters for ASCII protocol
As shown in the Fig. above, if "Activate BREAK monitoring" is selected, the SF red
indicator of CP340 will be on when RS232C cable is not connected or the serial
port of the communication partner is not activated.
7. If CP340 in RS422/485 interface is selected, the interface properties shall also
be set, as shown below:
Fig. 8: Configuration interface parameters
When the interface is in RS485 type (half-duplex mode), the initial state of the
receive side will be R(A)0V/R(B)5V, and it will not support wire-break detection
function. When the interface is in RS422 type (full-duplex mode) and the initial
state of the receive side is set as R(A)0V/R(B)5V, it will support wire-break
detection function. These 2 states correspond to the following interface pins of the
communication partner receive side:
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