IS230TVBAH4A High performance control module

The card stores the total current length of the diagnostics in masDiagLen and

the maximum possible diagnostics length in masDiagMaxLen. If the

maximum diagnostic length is less than 32, the card stores the extended

diagnostic data in the masDiagData array with the final two bytes stored in

masDiagExtOfs. If the maximum length is greater than 32, the first 24 bytes

of extended data are stored in masDiagData and masDiagExtOfs contains the

offset into the masCntrlExt area (3000h-3FFFh in the masCntrl page) where

the remainder of the diagnostic data is found.

Always check the current length in masDiagLen before reading the

diagnostics since the length of the diagnostic data sent by the slave may

change.The host can assign a designation string of up to 12 characters to each slave.

The host stores it in the masDesig array in the master control block for the

slave. This data is not sent out on the network to the slave. The host

application can use it to associate a specific slave with a configuration block,

then access the slave by name rather than by block number. For example,

even if block numbers or station numbers changed, your application could

still scan through the block list to find the block associated with the name in

the slave designation data area.

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