send HEX over serial

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Hello all, complete noob here. apologies in advance for asking something that might be simple, or complex..

so I have an LED sign that has an IR remote to send commands., i.e, up/down/righ/left.

the sign has a serial port, and as the manufacturer said, it accepts hex commands for up/left so and so.

my question is this, what, or how would i use to accomplished that? I have my computer connected to the sign via serial cable but i cant seem to pass a hex command, or dont know how.

the hex for say, off is NO. 5, HEX 5, DEC 5

so as dumb as it sounds im sendt "555" to the sign via serial but it doesnt do anything :(

any help as to the program and commands would be so appriciated..

Posted 1-Sep-15 12:29pm

edwinh2209

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Sergey Alexandrovich Kryukov 1-Sep-15 19:17pm

Well, try to send 0x555, it will be even dumber. :-)
Seriously, there can be million dumb problems. The documentation could be misread: communication parameters, command formats, anything. Moreover, the documentation can be inaccurate. The cable could be defective, and so on. So, it might be not even your fault. And — pay attention that you did not specify platform, language system type, nothing — it could so happen that you didn't even send any command... :-)
—SA

PIEBALDconsult 1-Sep-15 19:36pm

Not enough information. I've done quite a bit of communication with serial devices, but I wouldn't know where to start to help you really.
As ppolymorphe hinted, start with a terminal emulator just to see what happens when you type characters. This may give you a good idea of what's going on.
If you're in the Phoenix area, I'd be glad to help you in person.

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Patrice T · Answer 1 · 2015-09-01T12:57:00

Solution 1

You need:
- Signal documentation
- a terminal emulator (probably)

In documentation, you need to find:
- Communication speed
- Data format: number of bits, stop, parity
- Commends codes

When you have a communication up and running, you can think about programming.

Posted 1-Sep-15 12:57pm

Patrice T