Argox PA-20 Programming Guide - Manual (Page 93)

PT-20 Programming Guide 91
transmitted one by one until the specified number of character is sent. Use
the argument “port” as the connect port which is chosen to open. You can
c hoose 1(RS232). The argument “count” is the number of words of sending
data.
If you select RS-232 and set hardware flow control(CTS/RTS), this function
will wait while data be transmitted.
Returns： -1 : error
Other value: the number of words that success writing into.
open_com
Purpose： Initialize and enable specified RS232 port
Syntax： int open_com(int com_port, int setting);
Example call： open_com(1,0x0b);/*openCOM1，baud rate 38400,8 data bits,no parity,no
handshake*/
Includes： #include “SDK.h ”
Description： The open_com function initializes the specified RS-232 port. It clears the
receive buffer, stops any data transmission under going, reset the status of
the port, and set the RS-232 specification according to parameters set. Use
the argument “port” as the connect port which is chosen to open. You can
choose 1(RS232).
Each bit of the argument “setting”：
D0
~
D2
baud rate 0 :115200 1-2 : 57600
3 : 38400 4 : 19200
5 : 9600 6-7 : 4800
D3 data bits 0 : 7bits 1 : 8bits
D4 Parity enable 0 : disable 1 : enable
D5 even / odd 0 : odd 1 : even
D6 flow control 0 : disabe 1 : enable
D7 flow control method 0 : CTS/RTS 1 : Reserved
Returns： 0 : Open fail
1 : Open success
Remark： When flow control set up disable and flow control method set up CTS/RTS.
When you use IR port, the baud rate only can be setted 115200, flow control
disable.
read_com
Purpose： Read 1 byte from the RS232 receive buffer
Syntax： int read_com(int port, char *c);
Example call： char c;
int i;