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Bosch control panels may use a B426, B450 or DX4020 network interface to communicate with a network receiver. Comm Trouble or Comm Fail events display on keypads as Comm Trouble SDI xx or Comm Fail SDI xx. When interpreted, the display indicates the physical address of the network communicator and the path number it used to communicate. Use this data to troubleshoot the Comm Fail/Comm Trouble.

 

1. Network interface when used on the SDI bus:

When connected to the SDI bus, the B426, B420 or DX4020 is addressed as SDI 88 or SDI 92. Refer to the device installation guide for address configuration.

Device                        Message                      Failing to Poll on:  
SDI88              Comm Trouble / Fail SDI 88               Address 88, Path 1
SDI88              Comm Trouble / Fail SDI 89               Address 88, Path 2
SDI88              Comm Trouble / Fail SDI 90               Address 88, Path 3
SDI88              Comm Trouble / Fail SDI 91               Address 88, Path 4

SDI92              Comm Trouble / Fail SDI 92               Address 92, Path 1
SDI92              Comm Trouble / Fail SDI 93               Address 92, Path 2
SDI92              Comm Trouble / Fail SDI 94               Address 92, Path 3
SDI92              Comm Trouble / Fail SDI 95               Address 92, Path 4

2.  Network interface when used on the SDI bus:

When connected to the SDI 2 bus, the B426, B420 or DX4020 is addressed as 1 or 2. Refer to the device installation guide for address configuration. 

Device-Addr              Message                      Failing to Poll on:
SDI2-1             Comm Trouble / Fail SDI 11               Path 1, Address 1
SDI2-1             Comm Trouble / Fail SDI 21               Path 2, Address 1
SDI2-1             Comm Trouble / Fail SDI 31               Path 3, Address 1
SDI2-1             Comm Trouble / Fail SDI 41               Path 4, Address 1

SDI2-2             Comm Trouble / Fail SDI 12               Path 1, Address 2
SDI2-2             Comm Trouble / Fail SDI 22               Path 2, Address 2
SDI2-2             Comm Trouble / Fail SDI 32               Path 3, Address 2
SDI2-2             Comm Trouble / Fail SDI 42               Path 4, Address 2

3.  New G Series (B8512G/B9512G) and B Series panels using Onboard Ethernet or Cellular:
Panels using Onboard IP or Plug-in Cellular will display the path number followed by device address 0.

Device                        Message                       Failing to Poll on:    
Onboard Ethernet       Comm Trouble SDI 10           Path 1, Address 0
Onboard Ethernet       Comm Trouble SDI 20           Path 2, Address 0
Onboard Ethernet       Comm Trouble SDI 30           Path 3, Address 0
Onboard Ethernet       Comm Trouble SDI 40           Path 4, Address 0

Onboard Cellular         Comm Trouble SDI 18           Path 1, Address 8
Onboard Cellular         Comm Trouble SDI 28           Path 2, Address 8
Onboard Cellular         Comm Trouble SDI 38           Path 3, Address 8
Onboard Cellular         Comm Trouble SDI 48           Path 4, Address 8

• Comm Trouble: Displays when the panel is not receiving an acknowledgement from the receiver prior to making retry attempts.
• Comm Fail:   Displays when the panel has not received an acknowledgement from the receiver prior to exhausting all of the programmed retry attempts.
• How to calculate the network supervision interval: 
• Supervision time= Poll Rate + Ack Wait + [(Ack Wait) x (Retry Count)]
  Example:
  Poll =210
  Ack=15
  Retry Count=5
       Supervision time = 210 + 15 + (5 x 15) = 300 seconds
                                    or 225 + 75 = 300seconds