20-101-1067 Rabbit Semiconductor, 20-101-1067 Datasheet - Page 98

• Manufacturer Part Number: 20-101-1067
• Description: MODULE RABBITCORE RCM3305
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-1067

• Module/board Type: MPU Core Module
• Product: Microcontroller Modules
• Flash: 512 KBytes
• Timers: 10 bit
• Operating Supply Voltage: 3.15 to 3.45 V
• Board Size: 47 mm x 69 mm x 22 mm
• For Use With/related Products: RCM3305
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1113

B.4.6.2 RS-485
The Prototyping Board has one RS-485 serial channel, which is connected to the Rabbit
3000 Serial Port C through an RS-485 transceiver. The half-duplex communication uses
an output from PD7 on the Rabbit 3000 to control the transmit enable on the communica-
tion line. Using this scheme a strict master/slave relationship must exist between devices
to insure that no two devices attempt to drive the bus simultaneously.
Serial Port C is configured in software for RS-485 as follows.
The configuration shown above is based on circular buffers. RS-485 configuration may
also be done using functions from the
The Prototyping Boards with RCM3305/RCM3315 modules installed can be used in an
RS-485 multidrop network spanning up to 1200 m (4000 ft), and there can be as many as
32 attached devices. Connect the 485+ to 485+ and 485– to 485– using single twisted-pair
wires as shown in Figure B-8. Note that a common ground is recommended.
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#define ser485open serCopen
#define ser485close serCclose
#define ser485wrFlush serCwrFlush
#define ser485rdFlush serCrdFlush
#define ser485putc serCputc
#define ser485getc serCgetc
#define CINBUFSIZE
#define COUTBUFSIZE 15
#ifndef _485BAUD
#define _485BAUD 115200
#endif
15
Figure B-8. Multidrop Network
PACKET.LIB
library.
RabbitCore RCM3305/RCM3315