D9412GV2/D7412GV2 | Troubleshooting Guide | 3.0 Troubleshooting
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Bosch Security Systems, Inc. | 11/05 | F01U011024B 79
Figure 35: DX4020 − DIP Switch Settings for
Address 88
Figure 37: DX4020 – Bus and Serial Status LEDs
and Jumper P2
R
Y
G
B
1
2
3
4
5
2
=
3
=
4
R
Y
G
B
1
OPEN
123456
78
1 - DIP Switches
2 - Open position
3 - Closed position
4 - SDE Address 88 switch settings
1 - BUS-XMIT LED
2 - BUS-RCV LED
3 - SER-RX LED
4 - SER-TX LED
5 - Jumper P2
Figure 36: D9133TTL-E − Jumper Setting for
Address 88
* Refer to Table 44 for descriptions of the LEDs
123 4
88
1
Table 44: DX4020 Bus and Serial Status LED
Functions
LED Name Color Function
1 BUS-XMIT Red Flashes when the
DX4020 sends data to
the control panel
2 BUS-RCV Red Flashes when the control
panel talks to any SDI
device (normally, this LED
flashes continuously when
the Reset pin on the
control panel is up.)
1 - Address Jumper, set for Address 88
3 SER-RX Green Flashes when data is
received by the Ethernet
port on the DX4020
4 SER-TX Green Flashes when data is sent
to the Ethernet port on the
DX4020