GE Digital Video Multiplexer Recorder User Manual

0150-0229D 

67 

Kalatel DVMRe StoreSafe 

Delimiter 

Class 

Command 

Data Length 

Data 

The Delimiter byte signals the start of a new message, and has a value of 0xFF. 

The Class and Command fields identify the type of message. 

The Data Length is a 16-bit value indicating the number of bytes in the Data portion of 
the message.  Data Length is sent using Intel byte ordering (Little Endian). 

The Check Sum byte is the result of XORing all the bytes in the message. 

Check Sum 

0xFF 

0x14 

0x40 

Data Length[0] 

Data Length[1] 

Camera 

Event 

String[0] 

String[1] 

: 

String[n-1] 

One message is currently supported to store text along with recorded video. 

CMD_NEW_ADD_TEXT 

Class byte is 0x14. 

Command byte is 0x40. 

Data Length is the number of data bytes in the message (from 2 to 502). 

Camera byte indicates the camera associated with the text.  The valid range is from 
0 to 15. 

Alarm/Event byte usage is described in the following section. 

String field contains text characters.  The string can be from 0 to 500 characters in 
length. 

Check Sum 

MSB 7 

 

LSB 0 

The two least significant bits are currently used for the 
event.  Bits 2 and 3 are used for Alarm  

0 

0 

0 

0  A  A  E 

If both the start and end bits are clear, the associated text will be stored with the next recorded field for 
that camera.  That cameras record rate will not be changed. 

If only the start bit is set, the associated text will be stored with the next recorded field for that camera.  
This will cause the selected camera, as well as any pre-event fields to be recorded at the Alarm or 
Event Record Rate. 

If only the end bit is set, the associated text will be stored with the next recorded field for that camera.  
This will start the post-event timer** after which, the selected camera will resume recording at the 
normal record rate*.