Data Sheet for Product

13
Siemens
CB1Q3973_en--_e
Smart Infrastructure
2022-03-21
Process bus
CE+, CE- (T6)
Bus cable length between 2 nodes
Max. 350 m
Total length of bus cable
Max. 700 m
DPSU
40 mA rated current
Third party bus
(RS-485 Modbus RTU)
A+, B-, REF (T5)
RS-485 (EIA-485)
Modbus RTU or BACnet MS/TP° mode
Bus connection
A+, B-, REF
Bus electronics
NOT galvanically isolated
Bus cable
Shielded if length>3 m, twisted pair
Bus polarization
Configurable by software
Bus termination
None*
°
BACnet MS/TP (with BSP 10.50 or higher)
*
On RS485 network, it is essential to use termination resistors that match the cable’s
characteristic impedance to prevent signal echoes from corrupting the data on the line.
Tools/HMI
Local service interface
(T-HI)
Cable connection
RJ45 jack, 8 pins, length of cable<3 m