General Information
1.7 Function 06: Preset Single Register
ATC5300
10
Modbus Communication Protocol, Edition 03/2011, A5E02469001-02
1.7
Function 06: Preset Single Register
This function allows to write in the registers. It can be used only with registers with address
higher than 1000 Hex. For instance it is possible to change setup parameters. If the value is
not in the correct range, the ATC will answer with an error message. In the same way, if the
parameter address is not recognised, the ATC will send an error response.
The address and the valid range for each parameter are indicated in Tables 5, 6 and 7. With
function 06, some commands (like passing from MAN to AUT and vice versa) can be possibly
executed sending the addresses and the values reported in Table 4.
Master message:
Slave response:
The slave response is an echo to the query, that is the slave sends back to the master the
address and the new value of the variable.
1.8
Function 07: Read Exception Status
This function allows to read the status of the automatic transfer switch.
Master query:
The following table gives the meaning of the status byte sent by the ATC as answer:
Slave address
08h
Function
06h
MSB register address
16h
LSB register address
03h
MSB data
00h
LSB data
1Eh
MSB CRC
FDh
LSB CRC
13h
Slave address
08h
Function
07h
MSB CRC
47h
LSB CRC
B2h
BIT
MEANING
0
Operative mode OFF / Reset
1
Operative mode MAN
2
Operative mode AUT
3
Operative mode TEST
4
Error on
5
AC power supply present
6
DC power supply present
7
Global alarm on
