the pdf says

Com Example (for mute set)

0x02 0x04 0xa0 0x53 0x01 0x01 0x07

what do i type in nevo ?

would i need a null modem cable instead of the nevo rs 232 cable . .



im using the nevo 232 cable to a db9 gender changer (female to female) to the back of the Sony ES


cant figure it out . .

I think you'd type in 02 04 A0 53 01 01 07, as the 0x at the start of each bit just indicated that it's HEX. Whether you need a null modem adapter/cable depends in the pin-out of the Sony receiver, however, if you have to use a gender changer, it tends to be the case (in my limited experience anyway) that you also need a null modem adapter. I make my own and just combine the gender change and null modem into one casing. Can you provide a link to the Sony protocol pdf? There's generally more to it than the info your offered: pin configuration, the various protocol params like baud rate, inof about start/stop bits & delimiters, etc.

Where did you find info on Sony's serial protocol? I used to use a Sony receiver and never could find anything. :(

i went to sony's site,
did a live chat with someone,
they told me they cant give me the codes cause im not authorized
but i should call a certain number to try . .

the phone number went to a cell phones voicemail,
saying to try emailing him . .

i emailed him what i needed,
and he emailed me back pdf's excel sheets etc,

eveything he emailed me is here:
idisk.mac.com/technologists-Public/sonyESrs232.zip


if you could help me get working with this it would be greatly appreciated . .
i dont really understand rs232 so well yet,
ive gotten my lg 42" pro monitor at home workign with rs232 but the connector went right in to the lg without adapters, and the coding was fairly easy . .

i dont really understand what a null modem would do for me ..

found this online . .

"Null Modem serial cables allows two DTE or DCE devices to communicate with no conflict in data transmission. The transmit and receive signals are crossed to ensure proper data transmission."

so basically just cleans the data transmission ?
would it make something not work if i didnt need it ?

[Link: en.wikipedia.org]

Brief tutorial on a null modems:

In the Nevo serial module, the male connector has a pin layout such that Pin2 transmits data (Tx), and Pin3 receives data (Rx). Pin5 is always ground. Now, in most devices that have a female RS232 chassis connector, the pin layout is is the opposite, such that Pin2 receives data (Rx) and Pin3 transmits data (Tx). If you think about it, this is what you need- Pin2 on the Nevo connector TRANSMITS data, so it needs to meet up with a pin on your device that RECEIVES data. That's why you can pretty much plug-and-go when the component has one of these female connectors.

If, however, the component has a male connector just like the Nevo module, you have two potential issues. First of course, you need a male-to-male adapter, also called a gender changer. But since those male connectors tend to have the same pin layout as the Nevo module, expecting to TRANSMIT on Pin2 and RECEIVE on Pin3, you need to swap these in your adapter or cable.

This is what is called a null modem. It can be just a little adapter, or it can be a cable, but the point is that it internally reverses those pins so they "meet up" right between the two things you're connecting, allowing them to talk to each other.


So that's the skinny on null modems. I'll take a look at the Sony documentation a little later and see what I can discern about it. (How lame that they don't make the info readily available....you have to be "authorized?" Geez, Sony, how....1980s.)

lol . . .

you are the man!
i now have a much better understanding of the null modem requirement - and when and why i might need it . .

sony sucks . .
so does the lack of RS232 info out there . .

thanks again . .


(one day we might all have usb? controllers ? how cool would that be . . )