Moxa Technologies C360 Uživatelský manuál stáhnout pdf (Strana 37)

For UNIX Users • • Chapter 4

31

int sio_read(int port, char *buf, int len)

return = >0 length of data received

0 no data received

-1 bad port

-2 time out

-5 port is not open

port = port number

buf = receive buffer pointer with required space

len = buffer length

4. Write a string of data to Tx buffer.

int sio_write(int port, char *buf, int len)

return = >0 length of data transmitted to Tx buffer

=0 buffer full

-1 bad port

-2 time out

-5 port is not open

port = port number

buf = transmit string pointer

len = transmit string length

5. Put a block of data to Tx buffer. If the Tx buffer free space is

smaller than block length, it will return zero.

int sio_putb(int port, char *buf, int len)

return = >0 length of data transmitted to Tx buffer

0 free buffer not enough

-1 bad port

-2 time out

-5 port is not open

-6 len > Tx buffer size

port = port number

buf = transmit string pointer

len = transmit string length

6. Non-TTY port parameter setting.

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