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DPC31 HW

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DPC31 HW Description

Version V1.0 Page 29

Structure of the Diagnosis_Reply Buffers:

The user transfers the Diagnostic_Reply buffer shown in Figure 5.2-4. The buffer control area is located in

the first 6 bytes. In the 7

byte, the user only enters the bit ‘Diag.Ext_Diag’ and in the 8

byte the bit

‘Diag.Stat_Diag’. The remaining bits in these two bytes can be assigned as required. The user sets up Byte

9 (StationStatus_3), Byte 11,12 (Ident_Number) and Byte 13..250 (Ext_Diag data) completely. Byte 10 is

used as wildcard for ‘Master_Add’ and can be assigned as required. During buffer exchange, DPS enters the

internal Diagnosis_Flags in Bytes 7 and 8 and also enters the ‘Master_Add’ in Byte 10 (refer to Figure 5.2-5).

7 6 5 4 3 2 1 0 Byte Name

0-5: Buffer Header

- - - - Diag.Ext

_Diag

---

6: StationStatus_1

- - - - - - Diag.Stat_

Diag

7: StationStatus_2

Diag.Ext

Diag_

Overflow

00000 0 0

8: StationStatus_3

------ - -

9: Wildcard

10: Ident_Number_High

11: Ident_Number_Low

12-249: Ext_Diag-Data

Figure 5.2-4:

Structure of the User_Diag_Reply Buffer

76543210Byte Name

0-5: Buffer Header

0 Diag.

Prm_

Fault

0 Diag.Not

Sup-

ported

Diag.Ext

_Diag

Diag.

Cfg_

Fault

Diag.

Station_

Not_Rdy

6: StationStatus_1

0 0 Diag.

Sync_

Mode

Diag.

Freeze_

Mode

Diag.

WD_On

1 Diag.

Stat_

Diag

Diag.

Prm_

Req

7: StationStatus_2

Diag.Ext

Diag_

Overflow

0000000

8: StationStatus_3

9: Master_Address

10: Ident_Number_High

11: Ident_Number_Low

12-249: Ext_Diag-Data

Figure 5.2-5:

Structure of the MAC_Diag_Reply Buffer

5.2.5 Write_Read_Data (Default SAP)

The MAC accepts the Write_Read_Data message only in the ‘Data_Exchange’ mode and only from the

‘Master_Add’ i.e., the locking master; otherwise, a negative acknowledgement ‘RS’ is generated. If the

received net data (output data) does not fit into indication buffer ‘D’, the service is ignored and the response

is 'no resource’.

The length of the indication buffer ‘D’ corresponds exactly to the data output configuration of the respective

slave. If the received output data is less than the length of the indication buffer, there is a configuration error.

In this case, DPS does the following: it sets ‘Diag.Cfg_Fault =1 ‘ (refer to diagnostic data), executes the

‘Leave_Master macro’ transitioning to ‘Wait_Prm’) and transmits the input data from the response buffer.

Otherwise, the received net data is written to the assigned indication buffer and the net data that is to be sent

is fetched from the assigned response buffer.

For the output data, 4 exchange buffers are available and for the input data, 3 exchange buffers.

With the read operation ‘User_Dout_Buffer state’, the user receives the current buffer assignment without

initiating a buffer exchange!

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