- on Microcontrollers
- Published in issue 11/2003 on page 0
Precision Measurement Central (4)
RS485, or networking the MSC1210 micro
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CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.
R1 = 220k?
R2 = 22k?
R3,R4 = 560?
R5 = 120?
R6,R7 = 1k?
R8,R9 = 47?
C1,C3,C5,C6,C11 = 10µF 16V radial
C2,C7,C8,C9,C12 = 100nF
C4 = 220nF (10% tolerance)
C10 = 10µF 35V radial
D1 = 1N4001 (DO41 case)
D2,D3 = 9V1 zener diode
D4,D5 = 4V7 zener diode
D6 = LED, low current, green, 3mm
D7 = LED, low current, red, 3mm
IC1 = MAX232 (DIL case)
IC2 = LTC485 or MAX487E (ESD/EMI-optimised) (DIL case)
IC3 = 7805 (TO220 case)
IC4 = 74HCT123 (DIL case) (Philips preferred)
K1 = 9-way sub-D socket, PCB mount, angled pins
K2 = 4-way PCB terminal block, 5mm lead pitch
S1 = 4-way DIL switch