SIEMENS RS485 Flush Mounted Room Thermostat User Manual
Diagrams
Connection terminals
RDF660MB/MM
RDF660MB
L, N
Y50
M
Operating voltage AC 230 V
DC 0...10 V fan output
Reference for DC fan
Control output “Valve” AC 230 V (N.O., for normally closed valves),
Y1, Y2
output for compressor or output for electric heater
B1, S1
Multifunctional input for temperature sensor (e.g. QAH11.1) or potential-
(RDF660MB/MM free switch
only)
Factory setting:
B1 = H/C changeover (DI)
S1 = Window contact
X1, X2
Multifunctional input for temperature sensor (e.g. QAH11.1) or potential-
(RDF660MB
only)
free switch
Factory setting:
X1 = Window contact
X2 = External temperature sensor
M
Measuring neutral for sensor and switch
RS485 signal / common ground (differential common)
RS485 Modbus connection
REF
A +
B –
RS485 Modbus connection
13
Siemens
A6V12005486_en--_d
2022-11-14
Smart Infrastructure
| General | Details |
|---|---|
| Name | SIEMENS RS485 Flush Mounted Room Thermostat User Manual |
| Make | SIEMENS |
| Language | English |
| Filetype | PDF (Download) |
| File size | 1.07 MB |

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