Control Register (3E0H - 3Ffh) - HMS AnyBus DataTransfer Design Manual

For more information about the usage of this area see appendix C for each ANYBUS module.
Note! The application does not have to access this area to initialise and use the ANYBUS module.

4.2.4 Control Register (3E0h - 3FFh)

• read / write (AB-DT ⇐⇒application)
Through the control registers all necessary actions are done for accessing the data in the DPRAM.
Furthermore it gives additional information of the environment, e.g. fieldbus type, fieldbus active, ...
The contents of the control register can be found in the following table. The functions are described in the
following sections.
Address
3E0h - 3F2h
3F3h
3F4h
3F5h
3F6h
3F7h
3F8h
3F9h Input length (Low)
3FAh Output length (Hi)
3FBh Output length (Low)
3FCh
3FDh
3FEh Application control
3FFh
1 Watch dog (3F3h)
• read only (AB-DT ⇒ application)
Register incremented each 32 milliseconds (ms) by the ANYBUS module. This is not a precision timer and
can differ +/- 10% between different ANYBUS modules. Can be used as an indication that the ANYBUS
module is operating without any errors
2 Baud rate (3F4h)
Baud rate for serial interface. Not used by the DPRAM interface, please see corresponding chapter.
3 ID number (3F5h)
• read only (AB-DT ⇒ application)
This register gives an ID-number of the board in use. The ID-number can be used to identify the revision of
the used board. It is not an unique number!
4 Software version (3F6h)
Name
Reserved
Watch dog
Baud rate
ID number
Software version
Fieldbus type
Input length (Hi)
Fieldbus event
System status
AB-DT control
HMS F
Description
Not used, reserved for future use.
Module watch dog. Incremented each ms.
Baud rate for serial interface. Please see corresponding chapter.
Module ID number.
Software version identifier.
Supported fieldbus system identifier.
Higher byte for input size register.
Lower byte for input size register.
Higher byte for output size register.
Lower byte for output size register.
Flag register for indication of fieldbus events.
Fieldbus and module status register.
Application indication register. Used by handshaking protocol.
A B indication register. Used by handshaking protocol.
NY US
S AB
IELDBUS YSTEMS
Design Guide
Revision 1.12
1998-08-12
Page 14 (35)