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RS485 CAN Shield User Manual

Rev: V1.4, Date: May 19

2015

share awesome hardware

RS485 CAN Shield

User Manual

Overview

The RS485 CAN Shield will easily enable RS485/CAN communication functions for your

NUCLEO/XNUCLEO Arduino boards.

Features:

 Arduino standard interfaces, compatible with Arduino boards like Arduino UNO, Leonardo,

NUCLEO, XNUCLEO

 when using with Arduino UNO, Leonardo, the CAN function is unavailable due to hardware

limitation

 RS485 function, onboard transceiver MAX3485, 3.3V power supply

 CAN function, onboard transceiver SN65HVD230, 3.3V power supply

Summary of content (9 pages)

PAGE 1
share awesome hardware RS485 CAN Shield User Manual RS485 CAN Shield User Manual Overview The RS485 CAN Shield will easily enable RS485/CAN communication functions for your NUCLEO/XNUCLEO Arduino boards. Features:  Arduino standard interfaces, compatible with Arduino boards like Arduino UNO, Leonardo, NUCLEO, XNUCLEO  when using with Arduino UNO, Leonardo, the CAN function is unavailable due to hardware limitation  RS485 function, onboard transceiver MAX3485, 3.
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RS485 CAN Shield User Manual share awesome hardware Contents Overview ..................................................................................................................................................... 1 1. Hardware Description ........................................................................................................................ 3 1.1. 2. Chip Pins Feature ................................................................................................................
PAGE 3
share awesome hardware RS485 CAN Shield User Manual 1. Hardware Description 1.1. Chip Pins Feature 1.1.1. MAX3485 The MAX3485 is 3.3V low-power transceivers for RS-485 communication. Each part contains one driver and one receiver. RS-485 work under single power supply and communicate with half-duplex mode. R RO 1 8 VCC RE 2 7 B DE 3 6 A Pin Name Function 1 RO Receiver Output.
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share awesome hardware RS485 CAN Shield User Manual 1.1.2. SN65HVD230 The SN65HVD230 controller area network (CAN) transceivers are designed by Texas Instruments. It applies to CAN bus serial communication of higher speed, anti-jamming capability and high reliability. On the SN65HVD230, pin 8(Rs) provides three different modes of operation: high-speed, slope control, and low-power modes. The sending pin Tx of CAN controller is connected to Driver input (D) of SN65HVD230.
PAGE 5
share awesome hardware RS485 CAN Shield User Manual Note: PA_2 and PA_3 of Xnucleo are Serial to USB ports as default. If you want use D0 and D1 as RS485 serial port, the jumper JP4 should be set: connect pin 1 and pin 3, connect pin 2 and pin 4.
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share awesome hardware RS485 CAN Shield User Manual  D8(PA_9), D2(PA_10) are the sending and receiving port of RS485.  D7(PA_8) is for RS485 sending or receiving enable. High level is for sending, low level is for receiving.  Message is sent to serial port of PC through D0 and D1.  The CANH and CNAL of one CAN port should be connected to another’s CANH and CANL port, and the A and B port of one RS485 should be connected to another’s A and B. 2.3.1.
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RS485 CAN Shield User Manual share awesome hardware TxMessage.Data[5] = 'e'; TxMessage.Data[6] = 's'; TxMessage.Data[7] = 't'; pc.printf( "**** This is a RS485_CAN_Shield Send test program ****\r\n"); while(1) { RS485.printf("ncounter=%d ",j);//RS485 sending wait(1); TransmitMailbox = CAN_Transmit(CAN1, &TxMessage);//CAN sending i = 0; while((CAN_TransmitStatus(CAN1, TransmitMailbox) != CANTXOK) && (i != 0xFFF)){ i++; } if(i == 0xFFF){ pc.printf("\r\can send fail\r\n");// Send Timeout, fail } else{ pc.
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share awesome hardware RS485 CAN Shield User Manual #include "mbed.h" #include "CAN.h" Serial pc(D1,D0); //serial print message Serial RS485(D8, D2); //RS485_TX RS485_RX DigitalOut RS485_E(D7); //RS485_E CanRxMsg RxMessage; //RxMessage char s[1024]; void callback()//RS485 RX interrupt handler {// Note: you need to actually read from the serial to clear the RX interrupt RS485.scanf("%s",s);//Save received messages pc.printf("\r\nRS485 Receive:%s \r\n",s);//Print Received messages } int main() { CAN
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RS485 CAN Shield User Manual share awesome hardware The CAN TxMsg: CAN Test CAN send TxMessage successfully RS485 send: counter=1 The CAN TxMsg: CAN Test CAN send TxMessage successfully RS485 send: counter=2 The CAN TxMsg: CAN Test The serial port of receiving side will print: **** This is a can receive test program **** RS485 Receive:ncounter=0 The CAN RxMsg: CAN Test RS485 Receive:ncounter=1 The CAN RxMsg: CAN Test RS485 Receive:ncounter=2 The CAN RxMsg: CAN Test RS485 Receive:ncounter=3 The CAN RxMsg: