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Errors
meaning
Parity
Parity is incorrect, data corrupted.
Framing
8- bit transmitted incorrectly and the data line does not return to logic 1 at the end of the transmission.
CRC
Cyclic redundancy code. When a message consisting of a number of 8 bit transmissions is sent, a calculation is
carried out to check that data corruption has not occurred.
Time out
Where an 8 bit transmission block is not fully received, the network card will time out ready to receive the next
error
message. Time out error will also be generated for each parity/ framing error.
Freeblock
Free memory blocks available to temporarily store messages waiting to be processed. The maximum number =
199, although it may drop as low as 175 - 180 on a highly populated network. A lower value may indicate a high
error value and will require rectification.
Fault Finding
¨
The communication path in a secure network alternates between end 1 (side 1) and end 2 (side 2) every minute.
¨
The network will be non secure until the last panel is connected and powered-up.
High errors
¨
Check cable lengths and type used.
¨
Check wiring, connections and earthing arrangements.
¨
Replace network card at point of failure.
¨
Check the addresses and baud rates of the input output and network cards of the networked panels.
¨
Check the network cable is correctly earthed to the equipment.
¨
It may be necessary to escalate an investigation to:
•
look at the noise voltage between conductors, screen and earth.
"
Always reset the Network Card first when rechecking for errors, using [Test/Eng] -> [Card] ->[Reset] ->
Network Card number, normally Card 6.
The networked system may now be configured for network commands to be actioned, such as master sectors and global alarms as
per site requirement.
4188-856_i2_12/06_Generic Vigilon (Compact + VA) Comms.
Vigilon (EN & BS) Compact (VA) panels
73
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