question about 74hc(t)03 and jp1-pins

[alterego]

Hi community!

i got a brand new URC-8060 (this remote is nice, damn... better than my old (newer) kameleon 2 - 4 in 1) and atm im building a serial interface following the Document from Tommy N. Tyler: "HOW TO BUILD A SERIAL PORT INTERFACE FOR JP1"

now i got 2 questions:

1. in my electronics-shop i only got a 74HCT03 well i dont know but i think its not that important if this IC supports only TTL input? since the voltage of an serial interface should be about 5Volt, shouldnt it?

2. since i didnt found a document about the jp1 pins and also the document from which i solder a serial interface atm seems do tell exactly which pin of my 8060 is which pin of my jp1-cable. could someone please clarify this?

thank you in advance,
alterego

[ElizabethD]

i think its not that important if this IC supports only TTL input? since the voltage of an serial interface should be about 5Volt, shouldnt it?

Should be. Is it? I doubt it. Laptops I'm familiar with run 3-3.5v at least on the parallel port, I suspect serial is low as well.
Have you seen this?
http://www.hifi-remote.com/forums/viewtopic.php?t=8719
Anyway, this is beyond my skills so wait for a more authoritative answer please

[binky123]

Serial voltages can range from +5v/-5v to +15v/-15v. TTL can range from 0-5v.

[The Robman]

2. since i didnt found a document about the jp1 pins and also the document from which i solder a serial interface atm seems do tell exactly which pin of my 8060 is which pin of my jp1-cable. could someone please clarify this?

The only question is whether the 6-pin is "upside down" or not, which is irrelevant as far as constructing the cable is concerned.

The typical pin arrangement for US JP1 remotes is:

2 4 6
1 3 5

and the typical arrangement for European JP1 remotes is:

5 3 1
6 4 2