Facility Control

Hi there guys, I need some help with this one.

I'm not really allowed to say what kind of scaler this is, as it was hell to even get their documentation.
But I need a way to change presets on this scaler... First step would be this one I guess...

4.5.1 Loading Preset to PVW
(1) Command

Loading Preset XX to PVW:
55 aa 00 00 fe 00 00 00 00 00 01 00 00 01 51 13 01 00 XX SUM_L SUM_H

The command data is hexadecimal. The XX indicates the preset No. (range: 0x00-0x0f,
indicating presets 1–16. For details on the specific preset No. codes, see Appendix 6.) SUM_L and
SUM_H constitute the checksum of this command frame, which is the sum of the underlined data
and 0x5555. The calculation formula is as below.

SUM = 0x00 + 0x00 + 0xfe + 0x00 + 0x00 + 0x00 + 0x00 + 0x00 + 0x01 + 0x00 + 0x00 + 0x00
+ 0x51 + 0x13 + 0x01 + 0x00 + XX + 0x5555, SUM = SUM_H<<8 + SUM_L (SUM_L stands for the
lower 8 bits of SUM, while SUM_H stands for the higher 8 bits of SUM.)

(2) Response packet

If the scaler response packet is in the following data format, the preset is loaded successfully.
aa 55 00 00 00 fe 00 00 00 00 01 00 00 01 51 13 00 00 b9 56

Now, the first part of the package is done easilly with a message builder or similar...
However, the SUM_L and SUM_H part is a bit trickier appereantly. I've tried to understand how it would work, but I just cant get a response from the scaler... Anyone care to give it a go/try?

Hello Alexander,
I'm not from Ross support, but that protocol looks very similar to this one that i built some control panel to, once:

https://www.avmatrix.net/products/16ch-sdi-multiviewer/?portfolioCats=11

From your message, it wasn"t clear, did your scaler change preset while you sending your message?

Basically, you need to calculate the sum, then convert it to binary, swap 8 higher bits with lower ones, and reconvert it to hex, i think.

I havent been able to get a single reaction out of the scaler as of now, so any help/input is appreciated!

Hi, here is some point, basic on my expirience on that kind of troubles:
0. Do you get ping from the device?
1. Are you sure that you send the command to right ip/port?
2. Maybe its UDP?
3. Remote control is enabled on device (remote=on)?
4. Firewall on the client side is disabled?

If you absolutly sure that those 5 points are good, then i recommend use on this point hercules application instead dashboard, to exclude mistakes from wrong delimiter configuration.
If there no success, then try to contact with the product support.

What is the model of this scaler?

Alex.

0 - Yup! 110% sure about this one.

1 - I should be. I can go over and check for typos, but quite sure it's correct.

2 - Hmmm.. Perhaps.. Can try that too...

3 - From what I can see it is.

4 - It's in house on the same switch, and frankly it has very little protection. It could be an oversight of course, but I highly doubt it.

Thanks for the chime in, I'll look over all the points. :)