GE 0150-0193G manual Message Structure, Message Type

8 RS232 Alarm/Event Generation/Text Insertion Protocol

The RS232 Alarm/Event Generation /Text Insertion Protocol is designed to deliver Alarm, Event (commands), and Text data to the DVMRe from serial interface devices through the RS232 port.

NOTE

Setting and Clearing Alarms with this Protocol is equivalent to activating and deactivating Alarms on the hardware alarm inputs.

8.1 Message Structure

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.

Delimiter

Class

Command

Data Length

Data

Check Sum

8.2 Message Type

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 alarm, event, or text. The valid range is from 0 to 15.

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

String fields contain text characters. The string length can be from 0 to 500 characters in length. The String field is not required. If text data is available, it will be recorded with the next video frame for the camera identified by the camera field.

0xFF

0x14

0x40

Data Length[0]

Data Length[1]

Camera

Alarm/Event

String[0]

String[1]

:

String[n-1]

Check Sum

0150-0193G 85 DVMRe Triplex