Record TPDUHeader
Unit
Declaration
type TPDUHeader = record
Description
: Represents the PDU header.
Overview
Fields
P:Byte; |
PDUHeadertype:Byte; |
a:Byte; |
b:Byte; |
number:Word; |
param_len:Word; |
data_len:Word; |
Error:Word; |
Description
Fields
P:Byte; |
|
Allways 0x32 |
PDUHeadertype:Byte; |
|
Header type, one of 1,2,3 or 7. type 2 and 3 headers are two bytes longer. |
a:Byte; |
|
Currently unknown. Maybe it can be used for long numbers? |
b:Byte; |
|
Currently unknown. Maybe it can be used for long numbers? |
number:Word; |
|
A number. This can be used to make sure a received answer corresponds to the request with the same number. |
param_len:Word; |
|
Length of parameters which follow this header. |
data_len:Word; |
|
Length of data which follow the parameters. |
Error:Word; |
|
Only present in type 2 and 3 headers. This contains error information. |
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