Rs485; Tamper And Main Power Fail; Led Indicators - Bosch Access Easy Controller 2.1 Hardware Installation Manual

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Access Easy Controller 2.1
7.1.6

RS485

Reference: Terminal Strip T13
Terminal strip T13 is used as a communication channel between the interface board (e.g. 4-
Reader board and 8-IO board) and the CPU. RS485 is a multi-drop communication channel. It
enables the CPU to disseminate and receive data to and from all the interface boards. It
consists of four 24-AWG-CAT5 cables, namely EARTH, B, A and SHIELD. All the interface
boards within the system are connected using the RS485 terminal. The diagram below shows
the connection on the terminal strip T13.
Figure 7.5: RS485
7.1.7

Tamper and Main Power Fail

Reference: Terminal Strip T12
Terminal strip T12 comprises of Tamper alarm and Main Power Fail alarm inputs. The Tamper
terminals are connected to a micro-switch that is used to monitor the enclosure's cover
against unauthorized tampering. Any opening of the enclosure cover will trigger the Common
Alarm output and sounds off the CPU buzzer. A Controller Tamper alarm message is sent to
the Transactions page of the AEC2.1 user software.
The Main Power Fail alarm will be triggered when the input AC power is cut off and the
backup battery takes over. The terminals will be shorted together.
PWR
FAIL
+ -
Figure 7.6: Tamper and Main Power Fail
7.1.8

LED Indicators

Reference: LED 1 to LED 8
LEDs 1 to 8 light whenever the associated relay is activated.
Reference: LED9
This LED indicates that the processor on the 8-IO board is running.
Reference: LED 10 and LED 11
These LEDs should blink in normal operation. This indicates normal communication between
the 8-IO board and the CPU board.
This LED is not used by the 8-IO board.
This LED is not used by the 8-IO board.
Robert Bosch (SEA) Pte Ltd
RS485
B
A
T13
TAMPER
+ -
T12
Hardware Installation Manual
8-Input-Output Board | en
2018.11 | 1.0.6 | F.01U.122.796
37

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