DA-710 Series Linux
Programmer Guide
4-4
IMPORTANT!
If the target baudrate is not a special baudrate (e.g. 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400,
4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600), the termios cflag will be set to the
same flag.
If you use
stty
to get the serial information, you will get speed equal to 0 for the special baudrate.
Digital I/O
Digital Output channels can be set to high or low. The channels are controlled by the function call
set_dout_state( )
. Use the digital input channels to detect the state change of the digital input signal. The DI
channels can also be used to detect whether or not the state of a digital signal changes during a fixed period of
time. This can be done by the function call,
set_din_event( )
.
Return error code definitions:
#define DIO_ERROR_PORT -1
// no such port
#define DIO_ERROR_MODE -2
// no such mode or state
#define DIO_ERROR_CONTROL -3
// open or ioctl fail
#define DIO_ERROR_DURATION -4
// The value of duration is not 0 or not in the range,
40 <= duration <= 3600000 milliseconds (1 hour)
#define DIO_ERROR_DURATION_20MS -5
// The value of duration must be a multiple of 20
ms
#define DIO_OK 0
DIN and DOUT definitions:
#define DIO_HIGH 1
#define DIO_LOW 0
Moxa functions for DI/DO
Function
int set_dout_state(int doport, int state)
Description
Set the DOUT port to high or low state.
Input
<doport> The DOUT port you want to set. Port starts from 0 to 3
<state> Set high or low state; DIO_HIGH (1) for high, DIO_LOW (0) for low.
Output
none
Return
refer to the error code
Function
int get_din_state(int diport, int *state)
Description
Get the DIN port state
Input
<diport> The DIN port to get the state of. Port numbering is from 0 to 3
<state> Save the current state
Output
<state> DIO_HIGH (1) for high, DIO_LOW (0) for low
Return
Refer to the error code
Function
int get_dout_state(int doport, int *state)
Description
Get the DOUT port state
Input
<doport> The DOUT port to get the state of.
<state> Save the current state.
Output
<state> DIO_HIGH (1) for high, DIO_LOW (0) for low
Return
Refer to the error code
