Data Sheet for Product

3
Siemens
CB1Q3934en
Building Technologies 2018-04-12
Technical data
General Data
Dimensions (w x h x d) 45 x 110 x 75 mm
Materials and Colors ● Base: Plastic, pigeon-blue RAL 5014
● Housing: Plastic, light-grey RAL 7035
Weight excl. packaging 85 g
Power supply
Power supply Via system interface from controller
DC 5 V (± 5 %), max. 140 mA
Interface
Modbus RS-485 (EIA-485) 2 interfaces on terminal T1 and T2
Bus connection and terminal A+, B-, REF
Bus electronic Galvanic isolated
Bus cable Shielded twisted pair (like AWG 24)
Bus termination* Switchable by software (120 Ω + 1 nF) with
bus polarization
Bus polarization Switchable by software (680 Ω) with
bus termination
Baud rate 600, 1200, 2400, 4800, 9600, 19200, 38400
Network electrical loading 1
NOTICE! It is essential to use a network termination on each end of the RS485 line, which matches the cable
impedance to prevent signal reflections and corrupting the data on RS485 network.
Terminal, wiring and interface
Connection terminal Equipped with plugs: 2 x Phoenix FKCT 2,5 /3-ST
For other types of plug (optional), refer to:
Climatix range document 3900 (CB1Q3900en_xx)
Wiring Solid wire: 0.5…2.5 mm
2
Stranded wire (twisted or with ferrule): 0.5…1.5 mm
2
COMM interface plug Equipped with board-to-board: ZEC1,0/10-LPV-3,5 GY35AUC2CI1
Ambient conditions and protection classification
Degree of protection of housing to
EN 60529
IP20
Climatic ambient conditions
Transport as per EN 60721-3-2 Class 2K3
Temperature: -40...70 °C
Humidity: <95 % r.h.
Atmospheric pressure: Min. 260 hPa, corresponding to
max. 10000 m above sea level
Operation as per EN 60721-3-3 Class 3K7
Temperature: -40...70 °C
Air humidity: <90% r.h.
Atmospheric pressure: Min. 700 hPa, corresponding to
max. 3000 m above sea level