Other Functions; Retrofitting The Rs-485 Interface - Samson Trovis 6400 Mounting And Operating Instructions

Retrofitting the RS-485 interface

Example: Query for the undefined holding register 500
Query from the central control station
Address Function
01 03
Response from the process control station
Address
01
In case of an error, the function byte is combined exclusive OR with 80
indicates the master (central control station) that an error has occurred.

9.5.10. Other functions

Broadcast commands of the central control station are supported.
9.6. Retrofitting the RS-485 interface
Important! When retrofitting the interface board, the soldering jumpers LB1, LB2 and LB3 on
the logic board have to be closed (see section 4.2., p. 19).
Install the interface board as follows:
1. Open case of the process control station, see p. 12, section 3.3. , step 1.
2. Withdraw the controller unit from the case from the front side.
3. Unscrew the four screws (1, 2) and remove the two distance bolts (4) (see Fig. 5 , p.13).
4. Carefully withdraw the input board from the case.
5. Insert the interface board in the associated slot (s. p. 13 , Fig. 5 ), making sure that the
components on the board face the input board and the logic board.
6. Reinstall the input board.
7. Then proceed as described under 8. to 10. in section 3.3., p. 13.
66
Addressholding register Quantity holding registers
high low
01 F4
Function Error message
83
high low
00 01
low
02 C0
Interface RS-485
Checksum
low high
C4 04
Checksum
high
F1
, i.e. bit 7 is set. This
H