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![]() Click Here to Visit our Sponsor This article describes connection between personal computers and calculators or electronic diaries (SF and CSF families) CASIO using integrated circuits MAX232 and MAX233. Serial
ports Serial ports Description of integrated circuits MAX232 and MAX233 Integated circuit MAX232 by Maxim Integrated Circuits is a bidirectional converter RS-232 <=> TTL powered by +5V. Contains two RS-232 => TTL (CMOS) and two TTL (CMOS)=> RS-232 converters. Both invert the signals to achieve required output. Device has internal voltage multiplier and inverter. Multiplier uses capacitor C1 to multiply voltage +5V to +10V on capacitor C3 (output V+) and inverter C2 to invert voltage +10V to -10V on capacitor C4 (output V-). Recommended value is 1 uF. Circuit MAX233 is a 20-pin version of the 16-pin MAX232, which has these 4 capacitors built in. Both circuits support transmission speeds up to 120 kb/s, various packages are available (pay attention to different pinouts of the DIP and SO packages of MAX233) Maxim also makes integrated cicuits MAX232A and MAX233A, which are different from presented types only in higher transmission speed - 200 kB/s- and lower values of capacitors - 0.1 uF.
![]() ![]() Cable construction, design, gadgets specification
![]() MAX233 device is longer than the MAX232 of about one fifth of an inch,
but we don't have to use four capacitors.
![]() I recommend using the MAX232 design, it is cheaper. Partlist : 1x diode 1N4148 Connection of two calculators or two diaries Instead of the expensive cable SB-62, which is used for connection of two calculators or two diaries, you can create its equivalent much cheaper. It is only a cable with two stereo jacks 2.5 mm, with transmit and receive signals crossed (R to T, T is on the tip of jack):
![]() ![]() Calculators Communication program Here you can download communication program CASIO Program-link
FA-122 ver. 1.00 for Windows (only for types FX-7400G, CFX-9850G and
CFX-9930GT, types FX-9700GE and CFX-9800G can receive only). Other types
are supported by FA-121, which is not freeware. FA-122 has internal simple
program editor for comfortable work. It also has one disadvantage -
there's no compiler, so you still have to download programs to the
calculator when programming. File size is 523kB, author Casio Computer
Co., Ltd.. CASIO Program-link : Local mirror at HW.cz Links Graphics Calculator Programs, Casio CFX-9850G Programs, Sanoy's Casio Programs, SilverSTone Casio fx Support, MadManu's CASIO Home Page, Rolf Klausens Casio Site, CasioGazette-The Happy Parrot Casio New Sletter Casio Link Site
![]() Diaries (organizers) Communication programs Here you can download communication programs CASIF/WIN ver. 1.9e
for Windows (shareware) and Diary Link 97 for Windows 32bits (demo). Both
have very good graphic processing and provide comfortable adjustment of
enviroment. First of them has size of 1.5 MB and offers fully functional
enviroment, reminds to register on startup. Author is IMSL Software.
Second one uses BDE (Borland Database Engine) for operating with databases
and its author is Integrated Engineering Systems cc. Installation of this
program takes up about 5 MB of disk space. Since it is a demo version, it
has one big disadvantage. You can not transmit a group of items, only one
by one More information is at www.jamesralph.com/jr_diglink.html
CASIF/WIN ver. 1.9e for Windows Local mirror at HW.czDiary Link 97 Local mirror at HW.cz Casio
Digital Diary Communications Information Center
Written by: Michal
Prazan |
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