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4.5 Serial Communication Calls
Library files included with Dynamic C provide a full range of serial communications support.
The RS232.LIB library provides a set of circular-buffer-based serial functions. The
PACKET.LIB library provides packet-based serial functions where packets can be delimited
by the 9th bit, by transmission gaps, or with user-defined special characters. Both libraries
provide blocking functions, which do not return until they are finished transmitting or receiv-
ing, and nonblocking functions, which must be called repeatedly until they are finished. For
more information, see the Dynamic C Function Reference Manual and Technical Note 213,
Rabbit 2000 Serial Port Software .
Use the following function calls with the Smart Star.
int serMode(int mode);
User interface to set up serial communication lines for the Smart Star control system. Call this function
after serXOpen() .
PARAMETERS
mode is the defined serial port configuration of the CPU Card.
Mode
Serial Port
Parallel Port
C (PC2 and PC3)
D (PC0 and PC1)
D (PD0 and PD1)
0
1
2
RS-232, 3-wire
RS-232, 3-wire
RS-232, 5-wire
RS-485
RS-232, 3-wire
RTS/CTS
3
RS-232, 5-wire
RS-485
RTS/CTS
RETURN VALUE
0 if correct mode, 1 if not.
ser485Tx();
Enables RS-485 transmission (disables receive) on serial port D.
RETURN VALUE
None.
SEE ALSO
ser485Rx
User ’s Manual
49
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