Siemens SIDOOR AT40 System Manual page 144

Controllers
6.6 Connecting terminals and interfaces
Task
The USS module enables the SIDOOR ATD410W door controller to be connected to a USS
fieldbus.
A maximum of 32 nodes (1 master, 31 slaves) can be connected to the USS bus.
Interface
Data is transmitted according to the standard EIA 485 (/2/). The transmission is in principle
half duplex, this means that sending and receiving take place alternately and have to be
controlled by the software.
LED signals
The following five status LEDS are available on the USS module:
LED Description
H1 Relay K1 picked up
LED H1 switches on when the controller has detected the CLOSED
position and the pulse generator ceases to output pulses. The LED
H1 is controlled by the basic module (signal X200.11).
H2 Relay K2 picked up
LED H2 switches on when the current distance of the door to the
OPEN position falls below 2 cm and the relay has switched on. The
LED H2 is controlled by the basic module (signal X200.9).
H3 Valid incoming telegram
LED H3 is controlled by the basic module (signal X200.12), and
indicates the communication status. The LED flashes to indicate
incoming, valid telegrams. Each signal change stands for such a
telegram.
H10 P5V = OK
H11 P5V_ISO (X705.6) = OK
144
Position
AT40, ATD400V, ATD400K, ATD4xxW, ATD400S, ATE250S, ATD400T
System Manual, 06/2016, A2B00096162-AN