Technical Manual

East Wind Technologies, Inc.

2 Communication Interface

2.1 RS232C interface

2.1.1 Physical Interface

RS232C is the UART interface which belongs to RS232C-level. The communication between

RS232C and PC is via TXD, RXD and GND pins. The host TXD pin connects to the device RXD pin,

meanwhile the host RXD pin connects to the device TXD pin.

The communication protocol is byte oriented. Both sending and receiving bytes are in

hexadecimal format. The communication parameters are as follows:

Baud rate: 19200bps (default), 115200bps, 9600bps, 38400bps and 57600bps.

Start bits: 1bit

Data bits: 8 bits

Stop bits: 1 bit

Parity check: None

Flow control: None

2.1.2 Communication Process

Host send command to the slave, and the slave to execute once received the host's command, then

to send the result to the host. This is a command cycle.