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service pin LED
Reset
Service
Diagnostic
RX
UART1
TX
RX
UART2
TX
RX
UART3
TX
RX
UART4
TX
1 2
S3
2
Siemens Building Technologies
Cerberus Division
2
Product description
2.1
The CPU board
The CPU board (Fig. 1) is the only board that composes the Cerban Splitter CBS-3.
S4
NC
2
3
Flash EPROM
CPU
3
4
5
6
7
8
Fig. 1 The CPU board
On this board there are:
§ the CPU, the RAM and Flash EPROM
§ the Real Time Clock (RTC)
§ two UART chips, that manage the four GW-21 serial lines
§ the Neuron Chip, that lets the GW-21 to communicate with the LonWork network
§ four dip switch blocks (S1 - S4), used to configure the GW-21 as described later
§ one reset push-button, used to reset the board
§ one service push-button, to send the service signal to the Neuron Chip
§ four sets of two LEDs. These LEDs show the status of UART RX/TX lines.
§ three LEDs used for diagnostic purposes.
4
5
6
7
8
RAM
UART
UART
RTC
8
Neuron
7
Chip
6
5
4
3
S1
2
1
8
7
6
S2
5
4
3
2
1
e1148c
06.2000
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