Data Sheet for Product

Siemens CB1Q3903en

Smart Infrastructure 2020-04-08

RS-485 Modbus RTU A+, B-, REF (T6)

RS-485 (EIA 485) Modbus RTU mode

Bus connection A+, B-, REF

Bus electronics Galvanically separated

Bus cable Shielded if length > 3m , twisted pair

Bus termination (switchable via software) 680 Ω / 120 Ω +1 nF / 680 Ω

Communication module interface

• Connection via plug at bottom left of the controller.

• Based on SPI interface for the communication module connection.

Number of COM modules Max. 3 (self-acting module detection)

Power supply DC 5 V ±10% / max. 1A (short-circuit-proof)

Board-to-board (not included) ZEC1.0/10-LPV-3.5 GY35AUC2CI1

Local HMI service interface (T-HI)

Connection RJ45 jack (8 pins)

Cable length < 3m

Tool communication USB

HMI communication RS-485

HMI power supply 24 V max. 100 mA

• Use USB cable POL0C2 for tools

• HMI cable included in POL895.51

Bus termination (fix) 680 Ω / 120 Ω +1 nF / 680 Ω