I have a 3800BD that I have hooked up RS232 via straight thru cable per specs
(pin2 of unit is TX). I have the 2500/3800 specification doc which identifies all the codes used. I do have communication with the device as I keep getting a 15h (error code) from the unit whenever a command is sent. The basic command structure is:
STX Command Parameter1, P2, , , thru P5 ETX BlockCheckLow BlockCheckHigh
or for 'Power Off'
02h (STX),21h (Cmd),0h (P1),0h (P2),0h (P3),0h (P4),0h (P5),03h (ETX),32h (BCCL),34h (BCCH)

I have tried:
\x02\x21\x00\x00\x00\x00\x00\x03\x32\x34
\x02\x21\x03\x32\x34
02210000000000033234
0221033224
02 21 00 00 00 00 00 03 32 34
02 21 03 32 24
02,21,00,00,00,00,00,03,32,34
02,21,03,32,24
02, 21, 00, 00, 00, 00, 00, 03, 32, 34 (ccp format)
02, 21, 03, 32, 24
$02$21$00$00$00$00$00$03$32$34
$02$21$03$32$24

I'm pretty sure Ive covered every combination of Hex and ASCII but it always returns a '15'h.

The documentation implies that param placeholders must be used (0h) no matter what, but as I ve said I get the same results with and without them.

CCP lists the 2500BD codes as hex with commas, but I've not been able to make them work.

Can anybody provide suggestions? At least I am talking to it, it just has no idea what I'm asking.

Thanks
Bill

I have controlled many of these players via RS-232. It does require a straight-thru connection and the parameters are 9600,8, Even, and 1. Make sure you are set up to send HEX commands and not ASCII. The power off command is 02 21 00 00 00 00 00 03 32 34. Also make sure you turn off power savings in the set up menu as that turns off the RS-232 port while the unit is in Standby. You also might want to make sure you have the latest firmware installed. You should try using hyper terminal or a similar program to rule out that something is not correct with your control system. Hope that helps.

Also, I forgot to mention that I have turned off the 'Auto Power' and 'Power Save' features in the BD player.

Yes thank you, I'm actually using a terminal program that one of the RC members wrote. Works great ... I have tried, adnauseum, to get this command to work, but I just get a '15h'. I have tried both Even and No Partity, but neither seem to work.
I know my laptop and serial connection/cables work, as I have used them quite successfully on my Denon gear.
Its just this darn BD player. I'm also having trouble with my new Panny Plasma, but thats in another post ...
Thanks for the suggestion
/r
Bill