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A Hub for RS-422 and RS-485 Devices

Wire Your Bus Like a Star

A Hub for RS-422 and RS-485 Devices
A Hub for RS-422 and RS-485 Devices
Labs Project
Based on a Labs project | December 2021 | Find it here
RS-485 or RS-422 buses are still widely used in industry for access control, video surveillance and many other applications. However, the standard requires daisy-chain wiring, which can be restrictive. Here’s how to adapt to star topology wiring.
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Materials

Component list

Component List

Resistors (0805, 0.1 W)

R1, R2, R7…R9, R31, R37…R40 = 4.7 kΩ, 1%

R3, R41…R45 = 1 kΩ, 1%

R4, R10 = 22 kΩ, 1%

R5, R6, R13, R20, R25, R30, R32 = 120 Ω, 1%

R11, R12, R14…R19, R21…R24, R26…R29, R33…R36 = 47 Ω, 1%

R46…R55 = 560 Ω, 1%

 

Capacitors

C1 = 47 µF 35V

C2 = 220 µF 10V

C3…C5, C8, C12…C14, C24, C30 = 100 nF, 0805

C6, C7 = 1 nF, 0805

C20 = 10 nF, 0805

 

Inductors

L1 = 100 µH

 

Semiconductors

D1, D2, D4…D6, D28 = PML4148

D3 = 1N4004

D7 = MBRS130LT3

D8…D27 = PESD5V2S2UT

IC1, IC2 = 74HC14D

IC3, IC6…IC9 = MAX489CSD

LED1, LED3…LED8 = 5 mm green LED

LED2 = 5 mm orange LED

U1 = LM2674-5

 

Miscellaneous

JP1…JP5 = 2-pin male header, 2.54 mm pitch

X1, X7 = 2-pin connector, 5.08 mm pitch, MSTBVA 2,5/2-G-5,08

X2…X6 = 5-pin connector, 3.81 mm pitch

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