參數(shù)資料
型號： 101-1226
廠商： Rabbit Semiconductor
文件頁數(shù)： 167/168頁
文件大?。?/td> 0K
描述： RCM3900 DEV KIT UNIVERSAL
標準包裝： 1
系列： RabbitCore 3900
類型： MPU 模塊
適用于相關產(chǎn)品： RCM3900
所含物品： RabbitCore 模塊、開發(fā)板、交流適配器、纜線和 Dynamic C? 光盤
其它名稱： 316-1137
RabbitCore RCM3900 User’s Manual
98
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.
#define ser485open serCopen
#define ser485close serCclose
#define ser485wrFlush serCwrFlush
#define ser485rdFlush serCrdFlush
#define ser485putc serCputc
#define ser485getc serCgetc
#define CINBUFSIZE
15
#define COUTBUFSIZE 15
#ifndef _485BAUD
#define _485BAUD 115200
#endif
The configuration shown above is based on circular buffers. RS-485 configuration may
also be done using functions from the LIB\PACKET.LIB library.
The Prototyping Boards with RCM3900 modules installed can be used in an RS-485 multi-
drop 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.
Figure B-8. Multidrop Network
RS-485
RS485+
GND
RS-485
RS485+
GND
RS-485
RS485+
GND
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