77 … 96
76 … 96
Printed in Germany • Edition 04.18 • Nr. 271 958
Modbus data
Modbus RTU or ASCII mode
The modbus protocol can be switched
over to ASCII mode using the function
code 0x41.
The setting is permanently saved in the
slave.
Standard value (delivery) is modbus
RTU, 19200 Band and Even Parity.
Modbus output data master to MPA
The output data are commands to the
MPA. Use the following function codes
to write these specications.
05 (0x05) write Single Coil
06 (0x06) write Single Register
The output data have 16 bits, see table
Bit Register address 0
0 Heat request
1 Ventilation
2 Remote unlocking
3 Output terminal 11
(if P19 = 11)
4 Not used
5 Not used
6 Not used
7 Not used
8 Not used
9 Not used
10 Not used
11 Not used
12 Not used
13 Not used
14 Not used
15 Not used
Command contents of assigned bits:
Bit 0 (heat request) set to 1 by master =
heat request.
Bit 1 If bit 1 (ventilation) is set to 1 by the
master, the air valve is activated in the
states 0 (error), 7 (ame: waiting for heat
request) or state 26 (HT: waiting for heat
request) (P241).
Bit 2 (remote unlocking) set to 1 by
master (at least 0.5 s max. 5 s) = MPA is
unlocked.
Bit 3 If bit 3 is set to 1 by master, the
output X11 is switched on (P19=11).
Bit 4-15 not used
Modbus input data MPA to master
Input data is information about the state
of the MPA.
An EBx contains 16 bits.
Use the following function codes to read
this information.
03 (0x03) Read Holding Registers
01 (0x01) Read Coils.
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