Edit:   Full list of commands on post 8
 

Could someone wiser than me take a look at the protocol for this DVR?

[Link: ikegami.com]

it starts on page 81 of the PDF


I am getting stuck on the instructions for BCC

"BCC            Exclusive OR from byte next to SOH through ETX"


Could someone give me a sample code?

I've  never dealt with RS232 codes like these. 

Thanks in advance.

This should be the command for CH01:
01 53 30 50 81 80 30 02 43 48 30 31 03 FB

"43 48 30 31" are CH01 converted from ASCII to HEX

"FB" is the BCC. It is calculated using the OR function:
1. Open Windows Calculator
2. Go to View>Scientific or View>Programmer
3. Put the Calculator in HEX mode
4. Use the "Or" function just like "+" or "-"
Do not count the "01" at the begining of the string.
To calculate the BCC for CH01 enter the following:
53 Or 30 Or 50 Or 81 Or 80 Or 30 Or 02 Or 43 Or 48 Or 30 Or 31 Or 03 Or   resulting in FB

thanks Mark, i see what I was doing wrong now.  I wasnt converting the CH01 command to hex and adding it up correctly. 

thanks a ton, i will verify the codes tomorrow. 

No Dice  :(

I get a response of 06, but it doesnt change inputs.   I also see the green remote light come on when I send the command.  

I tried contacting Ikegami and they arent much help.  They said that they think the code I entered is correct and suggested that I re-initialize the unit, which didn't help.


One other thing to note.  I had to connect pins 7 and 8 on each DB9 connector and cross them over for the unit to respond at all.  connecting pins 2,3, and 5 alone doesnt give me any response back.

If you are receiving 06, that means the unit is acknowledging the commands. Just to be sure change the BCC to something else and see what response you get.

I would try connecting Pin 7 of the DVR directly to Pin 8 of the DVR and not run it back to your control system.

i tried changing the BCC to a random hex code and it still comes back as 06

i connected pins 7 and 8 just now and it still works as before.  do i need to do anything with pins 4 and 6?  

i got a reply from Ikegami with the proper codes.   It turns out that I should have been calculating BCC using Xor, not Or.    Now I know what the "Exclusive" part stands for in this part of the instruction:

"Exclusive OR from byte next to SOH through ETX"  

Exclusive (X) + Or   =  Xor   

I can't believe that I didnt figure that one out on my own.  But yay for quality tech support.

  

here is the proper code for CH01

CH01 01,53,31,50,81,80,30,02,43,48,30,31,03,08


I will generate the rest of the codes and post them later, just in case someone might need them someday.

thanks for the education Mark


John

Front Switch Commands
Operation	Full Hex Code
Camera 1 Single screen display	01,53,31,50,81,80,30,02,43,48,30,31,03,08
Camera 2 Single screen display	01,53,31,50,81,80,30,02,43,48,30,32,03,0B
Camera 3 Single screen display	01,53,31,50,81,80,30,02,43,48,30,33,03,0A
Camera 4 Single screen display	01,53,31,50,81,80,30,02,43,48,30,34,03,0D
Auto/Quad	01,53,31,50,81,80,30,02,41,54,03,17
Pre-Alarm	01,53,31,50,81,80,30,02,50,41,03,13
Timer	01,53,31,50,81,80,30,02,54,49,03,1F
Menu	01,53,31,50,81,80,30,02,53,45,03,14
Search	01,53,31,50,81,80,30,02,53,43,03,12
Enter	01,53,31,50,81,80,30,02,44,43,03,05
Return/Cancel	01,53,31,50,81,80,30,02,52,4e,03,1E
Up	01,53,31,50,81,80,30,02,55,40,03,17
Down	01,53,31,50,81,80,30,02,44,57,03,11
Left	01,53,31,50,81,80,30,02,4c,46,03,08
Right	01,53,31,50,81,80,30,02,52,54,03,04
Record	01,53,31,50,81,80,30,02,52,44,03,14
Pause	01,53,31,50,81,80,30,02,50,53,03,01
Rewind	01,53,31,50,81,80,30,02,46,52,03,16
Reverse	01,53,31,50,81,80,30,02,52,56,03,06
Stop	01,53,31,50,81,80,30,02,53,54,03,05
Play	01,53,31,50,81,80,30,02,50,4c,03,1E
Fast Forward	01,53,31,50,81,80,30,02,46,46,03,02
Shift	01,53,31,50,81,80,30,02,53,49,03,18
Function Commands
Operation	Full Hex Code
Function Stop	01,53,31,50,81,80,30,02,53,54,50,4c,03,19
Funtion Record Stop	01,53,31,50,81,80,30,02,53,54,52,54,03,03
Function Camera 1	01,53,31,50,81,80,30,02,44,53,30,31,30,31,03,15
Function Camera 2	01,53,31,50,81,80,30,02,44,53,30,31,30,32,03,16
Function Camera 3	01,53,31,50,81,80,30,02,44,53,30,31,30,33,03,17
Function Camera 4	01,53,31,50,81,80,30,02,44,53,30,31,30,34,03,10
Funtion Auto Quad	01,53,31,50,81,80,30,02,44,53,30,34,41,03,50
Funtion Display On	01,53,31,50,81,80,30,02,44,53,4f,4e,03,14
Function Display Off	01,53,31,50,81,80,30,02,44,53,4f,46,03,1C
Hardware:
Use DB9 crossover cable
Controller Pin 2 to SDR Pin 3
Controller Pin 3 to SDR Pin 2
Controler Pin 5 to SDR Pin 5
Port Setup on Controller:
Baud Rate: 9600
Parity: None
Data Bits: 8
Stop Bits: 1
Flow: None

Never knew that's what the "X" stood for. I learn something new every day.

Is it possible to calculate using OR and Xor without a calculator?  is there a long form that I can write down to figure it out?   I would love to understand what these calculation methods are doing, instead of just pumping numbers into a calculator.