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user'
s guide to
RS485
Expand development system capabilities by
adding RS485 communication accessory board
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I want to express my thanks to you for being interested in our products and for having
condence in Mikroelektronika.
The primary aim of our company is to design and produce high quality electronic products
and to constantly improve the performance thereof in order to better suit your needs.
The Microchip, Atmel, NXP and CYPRESS name, logo and products names are trademarks of Microchip, Atmel, NXP and CYPRESS Inc. in the U.S.A. and other countries.
TO OUR VALUED CUSTOMERS
Nebojsa Matic
General Manager
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Introduction to RS485 4
Key features 4
System Specication 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. Dimensions 11
Table of Contents
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Introduction to RS485
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)).
01
02
03
04
05
Pads with female 2x5 header on back
side of the board.
DIP switch for pin selection.
Two pole screw terminals CN2 and CN3.
Jumpers for selecting slave/master mode.
ADM485 chip
Key features
01
02
03
04
05
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System Specication
power supply
5V DC
board dimensions
50.42 x 23.88mm (1.99 x 0.94“)
weight
~9g (0.02 lbs)
power consumption
~2mA outputs enabled
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Figure 1-2:
Connecting
RS485
1. Connecting with
development system
Figure 1-1:
RS485 connected to
development system
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.
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In order to connect RS485 to dierent development
system it is necessary to make settings on DIP switch
SW1. Every pin on DIP switch SW1 is connected to
dierent pin of 2x5 female header. In table 1 is given list
which switch on DIP switch SW1 should be turned ON for
dierent development system.
Development system: Turn ON switch number: Pin on female 2x5 header: Pin function:
EasyAVR, BIGAVR, Easy8051, BIG 8051 3 P0 RX
EasyAVR, BIGAVR, Easy8051, BIG 8051 6 P1 TX
BIGdsPIC, dsPIC PRO, EasydsPIC 2 P4 RX
BIGdsPIC, dsPIC PRO, EasydsPIC
5 P5 TX
EasyPIC, BIGPIC 4 P6 TX
EasyPIC, BIGPIC 1 P7 RX
R/T lines are defined in user program. 7 P2 R/T
8 P3 R/T
2. DIP switch settings
Figure 2-1: DIP switch
with 2x5 female header
Table 1
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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.
Figure 3-1: RS485 connected
with other device via wire
3. Connecting RS485 with
other RS485 devices
VCCGND
- +
Figure 3-2: RS485 screw
terminal pinout
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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 rst node in RS485 network place
jumpers J1, J2 and J3 (Master and Term. jumpers are placed);
- If accessory board is somewhere between rst and last node
remove all jumpers (Master and Term. are o); and
- And to place accessory board to last node just place jumper J1
(Master o and Term. is placed).
Figure 4-1: First node Figure 4-2: Node between rst and last Figure 4-3: Last node
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5. Schematic
VCC-MCU
VCC-MCU
R2
4K7
R6
120
R3
4K7
R1
1K
U3
RX
R/T
TX
CN3
CN2
ADM485
RO
RE
DE
DI
VCC
B
A
GND
+
-
R4
56
R5
56
C1
100nF
VCC-MCU
P7
P4
P0
P6
P5
P1
R/T-P2
R/T-P3
P0
R/T-P2
P4
P6
P1
R/T-P3
P5
P7
VCC-MCU
SW1
J3
J2
J1
CN1
Figure 5-1: Connection schematic
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Figure 6-1: Dimensions
50.42mm(1.99'’)
16.36mm(0.64'’)
7.51mm(0.30'’)
23.88mm(0.94'’)
6. Dimensions
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Notes:
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Notes:
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Notes:
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transmitted in any form or by any means, without the prior written permission of MikroElektronika. The manual PDF edition can be printed for private or local
use, but not for distribution. Any modication of this manual is prohibited.
MikroElektronika provides this manual ‘as is’ without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties or
conditions of merchantability or tness for a particular purpose.
MikroElektronika shall assume no responsibility or liability for any errors, omissions and inaccuracies that may appear in this manual. In no event shall Mik-
roElektronika, its directors, ocers, employees or distributors be liable for any indirect, specic, incidental or consequential damages (including damages for
loss of business prots and business information, business interruption or any other pecuniary loss) arising out of the use of this manual or product, even if
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any time without prior notice, if necessary.
HIGH RISK ACTIVITIES
The products of MikroElektronika are not fault – tolerant nor designed, manufactured or intended for use or resale as on – line control equipment in hazardous
environments requiring fail – safe performance, such as in the operation of nuclear facilities, aircraft navigation or communication systems, air trac control, di-
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TRADEMARKS
The Mikroelektronika name and logo, the Mikroelektronika logo, mikroC, mikroC PRO, mikroBasic, mikroBasic PRO, mikroPascal, mikroPascal PRO, AVRash,
PICash, dsPICprog, 18FJprog, PSOCprog, AVRprog, 8051prog, ARMash, EasyPIC5, EasyPIC6, BigPIC5, BigPIC6, dsPIC PRO4, Easy8051B, EasyARM, EasyAVR5,
EasyAVR6, BigAVR2, EasydsPIC4A, EasyPSoC4, EasyAVR Stamp LV18FJ, LV24-33A, LV32MX, PIC32MX4 MultiMedia Board, PICPLC16, PICPLC8 PICPLC4,
SmartGSM/GPRS, UNI-DS are trademarks of Mikroelektronika. All other trademarks mentioned herein are property of their respective companies.
All other product and corporate names appearing in this manual may or may not be registered trademarks or copyrights of their respective companies, and are
only used for identication or explanation and to the owners’ benet, with no intent to infringe.
© Mikroelektronika™, 2011, All Rights Reserved.
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If you have any questions, comments or business proposals,
do not hesitate to contact us at oce@mikroe.com
RS485
v2.02
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