user's guide to Expand development system capabilities by adding RS485 communication accessory board RS485
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Table of Contents Introduction to RS485 4 Key features 4 System Specification 5 1. Connecting with development system 6 2. DIP switch settings 7 3. Connecting RS485 with other RS485 devices 8 4. Jumper settings 9 5. Schematic 10 6.
Introduction to RS485 01 Accessory board is designed for usage with various development systems and other MCU device with 2x5 header. RS485 additional board is designed for RS485 communication which is suitable for usage in electrically noisy environment on long distances (up to 1200m (4000ft)). 02 03 Key features 05 04 01 Pads with female 2x5 header on back side of the board. 02 DIP switch for pin selection. 03 Two pole screw terminals CN2 and CN3. 04 Jumpers for selecting slave/master mode.
System Specification power supply 5V DC power consumption ~2mA outputs enabled board dimensions 50.42 x 23.88mm (1.99 x 0.94“) weight ~9g (0.
1. Connecting with development system Figure 1-1: RS485 connected to development system Figure 1-2: Connecting RS485 RS485 is designed for connection with 2x5 male headers on development system port’s via 2x5 female header on accessory board. Every pin on 2x5 female header is marked so for proper orientation just compare marks between accessory board and development system.
2. DIP switch settings In order to connect RS485 to different development system it is necessary to make settings on DIP switch SW1. Every pin on DIP switch SW1 is connected to different pin of 2x5 female header. In table 1 is given list which switch on DIP switch SW1 should be turned ON for different development system.
3. Connecting RS485 with other RS485 devices Figure 3-1: RS485 connected with other device via wire GND In order to connect RS485 accessory board with other RS485 devices on a network it is necessary to provide twisted wires or shielded cable which is good choice if cable goes thru electrically noisy environment.
4. Jumper settings In order to determine which node in RS485 network will be assigned to RS485 accessory board it is necessary to set jumpers in appropriate position. - To set accessory board to first node in RS485 network place jumpers J1, J2 and J3 (Master and Term. jumpers are placed); - If accessory board is somewhere between first and last node remove all jumpers (Master and Term. are off); and - And to place accessory board to last node just place jumper J1 (Master off and Term. is placed).
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6. Dimensions 23.88mm(0.94'’) 16.36mm(0.64'’) 50.42mm(1.99'’) 7.51mm(0.
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