CODEWITHSUNDEEP
serial-port
youngSkywalker
youngSkywalker

Reputation: 21

RS-232 framing error

New here, so a bit about myself first:

I am a fire alarm commissioning engineer by trade, but like to mess with electronics as a hobby. my main area of interest is integration between various systems (which is one of the reasons I like doing fire alarms, as they interface with most systems in big buildings) and have recently started getting more involved with serial comms to interface systems, rather than boring relay contacts.

In my house, I have an 8X8 audio/video matrix switcher, this connects the stereo systems in all the rooms to each other so that i can patch any rooms audio to any of the other rooms in the house. This switcher has an RS-232 serial port on the back, which I'm hoping I can interface to either a PI or an arduino, so that I can control it via a web interface.

After a while searching, I found the protocol for it online... but things haven't gone so smoothly after that unfortunately.

Currently I'm just using a usb-232 converter and a null modem cable, along with a program called 232 analyser on my laptop... I can read data fine, and send data to the unit... but it keeps spitting back a 'framing error' message.

I'm not sure what I'm doing wrong, please could someone advise? this is the first time I've really used serial so pointers would be cool. One thing i did think is that the protocol specifies:

but my analyser program only lets me set the baud rate, data bits, parity, stop bit, and data format. not start bit. could that be my issue? and if so how do i get around it? thanks so much in advance!

protocol page 1

protocol page 2

Upvotes: 0

Views: 6127

Answers (1)

Kathy
Kathy

Reputation: 41

The format most commonly used for serial connections use one start bit, 8 data bits, no parity, and one stop bit.

Upvotes: 1

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