ADEMCO 5130XM Instrukcja Obsługi Pobierz pdf (Strona 69)

s~srmf COMMVNICATIONS

6 9

CHECKSUM

LIMITATIONS

Checksum is a means of verffylng a comnmmicator report without sending two

meSSage rounds. The way this works is as follows:

When the oommunicator has to send a report it qkkfy totals allof the digits in

the report (Account Number + Report Code). lt then adds to that total another

diilt. so that the grand total is evenly divisible by 15. This ‘other digit is the

Checksum digit. For example:

12343isthereporttobesent:

1+2+3+4+3r13total

13 plus 7 (checksum digit) = ‘15’ Grand Total:

‘15’ is evenly diiislble by 15!

When the receiver gets the message, it sinq)ly adds up the individual

message diiits received and divides by 15. lf evenly divisible. the report is

valid!

Note: 3+1 Low Speed (standard or expanded), 4+2 Low Speed (standard or

expanded), and High Speed reporting can be enabled to report wlth

checksum instead of Pround verification by entering a -1’ in field

49.4+2

Express, and Contact ID automatically send checksum, and do not have to

have this feature enabled.

If reporting in 3+1 Low Speed format with checksum, be sure that the 695

Digital Receiver is also set for 3+1 with checksum, otherwise there might be

confusion as to the meaning of the reports.

lf reporting in 4+1 Low Speed do

not enable checksum because ll will appear as a 4+2 report on the central

station’s receiver, and might cause confusion as to the meaning of the report!

ADEMCO’s VISTA XM SERIES TECENICAL REFERENCE MANUAL

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ADEMCO 5130XM Instrukcja Obsługi Strona 69