101-0681 Rabbit Semiconductor, 101-0681 Datasheet - Page 106

• Manufacturer Part Number: 101-0681
• Description: KIT DEVELOPMENT RCM3700 INT'L
• Manufacturer: Rabbit Semiconductor
• Series: RabbitCore 3000r
• Type: MPU Moduler

Specifications of 101-0681

• Contents: RabbitCore Module, Dev. Board, AC Adapter, Cable and Dynamic C® CD-Rom
• Processor To Be Evaluated: Rabbit 3000
• Interface Type: Ethernet
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 4.75 V to 5.25 V
• For Use With/related Products: RCM3700
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 101-681; 101-681

B.1.6.1 RS-232
RS-232 serial communication on the RCM3700 Prototyping Board is supported by an
RS-232 transceiver installed at U4. This transceiver provides the voltage output, slew rate,
and input voltage immunity required to meet the RS-232 serial communication protocol.
Basically, the chip translates the Rabbit 3000’s signals to RS-232 signal levels. Note that
the polarity is reversed in an RS-232 circuit so that a +5 V output becomes approximately
-10 V and 0 V is output as +10 V. The RS-232 transceiver also provides the proper line
loading for reliable communication.
RS-232 can be used effectively at the RCM3700 module’s maximum baud rate for distances
of up to 15 m.
RS-232 flow control on an RS-232 port is initiated in software using the
trolOn
of the flow control lines are specified using a set of five macros.
Standard 3-wire RS-232 communication using Serial Ports C and D is illustrated in the
following sample code.
RabbitCore RCM3700 User’s Manual
SERX_RTS_PORT—Data register for the parallel port that the RTS line is on (e.g., PCDR).
SERA_RTS_SHADOW—Shadow register for the RTS line's parallel port (e.g., PCDRShadow).
SERA_RTS_BIT—The bit number for the RTS line.
SERA_CTS_PORT—Data register for the parallel port that the CTS line is on (e.g., PCDRShadow).
SERA_CTS_BIT—The bit number for the CTS line.
#define CINBUFSIZE
#define COUTBUFSIZE 15
#define DINBUFSIZE
#define DOUTBUFSIZE 15
#define MYBAUD 115200
#endif
main(){
}
function call from
serCopen(_MYBAUD);
serDopen(_MYBAUD);
serCwrFlush();
serCrdFlush();
serDwrFlush();
serDrdFlush();
serCclose(_MYBAUD);
serDclose(_MYBAUD);
RS232.LIB
15
15
// set baud rate
// set size of circular buffers in bytes
// open Serial Ports C and D
// flush their input and transmit buffers
// close Serial Ports C and D
, where
X
is the serial port (C or D). The locations
serXflowcon-
104