Rice Lake PR5220 Ethernet Transmitter - Manual (Page 138)

Fieldbus Interface PR 5220 Instrument Manual
EN-138 Sartorius
Reading and Writing Register via Fieldbus
Reading Data: Read_Value, Read_Value_Select, Read_Value_Selected
When the master has to read from the instrument, the register number is transmitted in
Read_Value_Select
in the input area. The result is specified with Read_Value_Selected in the output area .
Action of the master Response of PR 5220
Writing register no. in Read_Value_Select
Writing the selected register in Read_Value
Copying Read_Value_Select into Read_Value_Selected
Waiting, until
Read_Value_Selected = Read_Value_Select
Reading Read_Value
Writing Data: Write_Value, Write_Value_Select, Write_Active
When the master has to write into the instrument, the required action is transmitted into the input area with
Write_Value_Select together with the data. Execution is indicated by bit Write_Active in the output area.
Action of the master Response of PR 5220
Writing value in Write_Value
Writing the register number in
Write_Value_Select
Writing Write_Value in the selected register
Setting bit Write_Active
Waiting, until Write_Active was set
Writing 0 in Write_Value_Select
Resetting bit Write_Active
Setting Bit: Action_Select, Write_Active
Single bits can be set or reset directly with
Write_Value_Select .
For setting, the bit number (80.. 127) is written in Write_Value_Select .
For resetting, the bit number + 128 (208..255) is written in Write_Value_Select .
Action of the master Response of PR 5220
Writing the register number in
Write_Value_Select
Writing Write_Value in the selected register
Setting bit Write_Active
Waiting, until Write_Active was set
Writing 0 in Write_Value_Select
Resetting bit Write_Active
Reading Bit
Single bits can be read only by reading a register. The procedure is described in Chapter 0.