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GM7HUD > TECH 23.03.05 17:04l 20 Lines 714 Bytes #999 (0) @ WW
BID : F92271GM7HUD
Read: GUEST
Subj: Re: volt readings
Path: DB0FHN<DB0MRW<DB0WUE<DK0WUE<7M3TJZ<ON0AR<GB7ESX
Sent: 050323/1440z 26887@GB7ESX.#31.GBR.EU $:F92271GM7HUD [Witham, Esx]NNA V3.1
N2JXN wrote:-
>
> Hello looking for som info. Building a rs232 to ttl interface and need to
> measure a - voltage. What
> would be the prefured meathod fo doing this
I've always found a voltmeter good for measuring voltages!
If you want to do RS232<>TTL then look at the chips available from Maxim
(www.maxim-ic.com). The MAX232 (which is getting long in the tooth) is a
simple to use chip which runs from a 5v supply. Maxim do many other similar
products including ultra low power versions, versions with high ESD
protection and versions with more or less level shifters.
You can also use the 1488 and 1489 level shifters but unlike the MAX232 and
friends, they need dual rail supplies.
73 de Andy GM7HUD
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