20-101-1028 Rabbit Semiconductor, 20-101-1028 Datasheet - Page 108

• Manufacturer Part Number: 20-101-1028
• Description: MODULE RABBITCORE RCM3750
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-1028

• Module/board Type: MPU Core Module
• Product: Microcontroller Modules
• Core Processor: Rabbit 3000
• Flash: 512 KBytes
• Operating Supply Voltage: 4.75 to 5.25 V
• Board Size: 75 mm x 30 mm x 23 mm
• For Use With/related Products: RCM3750
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1110

B.1.6.2 RS-485
The RCM3700 Prototyping Board has one RS-485 serial channel, which is connected to
the Rabbit 3000 Serial Port E through an RS-485 transceiver. The half-duplex communi-
cation uses an output from PF5 on the Rabbit 3000 to control the transmit enable on the
communication 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 E 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 RCM3700 Prototyping Boards with RCM3750 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 serEopen
#define ser485close serEclose
#define ser485wrFlush serEwrFlush
#define ser485rdFlush serErdFlush
#define ser485putc serEputc
#define ser485getc serEgetc
#define EINBUFSIZE
#define EOUTBUFSIZE 15
Figure B-8. RCM3750 Multidrop Network
15
PACKET.LIB
library.
RabbitCore RCM3750