D21m System
6.3.9

CobraNet® Card (,,)

A949.0445		
This card allows sending and receiving of up to 32 audio channels to/froma CobraNet®. DIP switches on the card allow setting the number of input or
output channels seen by the console. Default setting is 32 output and no input
channels. All settings of the CobraNet® module are made through SNMP.
Per default, the module is configured to be the conductor (synchronizationmaster) and providing multicast bundles 1-4 to the CobraNet® network. Thissetting is ideal for e.g. providing audio channels to a PA, installed sound, ormonitoring system using CobraNet®.
		For further information on CobraNet®, please refer to www.cobranet.info.				

Current consumption (5 V)
Operating temperature

SecondaryCobraNet
Port

Audio In

CM-1
ModuleGlue
Logic

Audio Out + Sync

DIP
SwitchAudio In
Audio Out + Sync

Backplane

Primary
CobraNetPort

800 mA
0-40 °C

Control
Logic		

ON
S1

60

1
2
3
4
56
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D21m System
DIP Switch

S1

DIP switch for D21m channel count setting:
1
OFFOFFOFFOFFOFFOFF:ON-6.3.9.1

2OFFOFFOFFOFFONON:ON-3OFF
OFF
ON
ONOFF
OFF
:ON-

45
OFF ONOFF ONOFF ON:ON- OFF- OFF
- OFF
- OFF
- OFF
- OFF
:
ON

6
OFFOFFOFF
OFFON
ON:
ON

7OFF
OFF
ONONOFFOFF:ON

8 Number of Channels- 0 inputs (factory default)- 8 inputs- 16 inputs- 24 inputs- 32 inputs- NOT ALLOWED
OFF 0 outputs
ON 8 outputs
OFF 16 outputs
ON 24 outputs
OFF 32 outputs (factory default)
ON: NOT ALLOWEDON

CobraNet Card Card Setup		This section describes how to use a (laptop) PC running the CobraNet Discovery® utility in order to configure the CobraNet card settings. This applies
to all versions of the card.		

The configuration of the card will be dictated by the network or other devices
that are being connected to the card, so it is not possible to give exact details
for individual parameters, but this guide shows how to access and edit thoseparameters.		 It is recommended that setting up a CobraNet network is carried out by anexperienced person, but if more information is required, useful documents
can be downloaded from the CobraNet website www.cobranet.info.
Installing CobraNet Discovery		

CobraNet Discovery is a free utility provided by the manufacturers of
CobraNet hardware, Cirrus Logic (http://www.cobranet.info/downloads/disco).		

Any earlier version of CobraNet Discovery present on your computer, suchas V3.0.2 or V3.4.2, should be uninstalled before. Install the latest version, as
some earlier versions require special configuration changes in order to accessthe bundle configuration of the CobraNet card.		

The latest version of the program (V4.0.2 or above) allows not only monitoring the CobraNet device parameters, but also the configuration of settings
such as bundle numbers, latency and bit depth. The application can be downloaded from the website www.cobranet.info. Follow the Downloads link onthat page. The installation is straightforward.

PC Ethernet Port Setup		

First the PC’s network port must be configured in such a way that it has afixed IP address in order to communicate with the CobraNet card (WindowsXPTM shown):
Click Start - Connect to - Show all connections - Local Area connection.
Right-click on the ‘Local Area Connection’ icon and select ‘Properties’:

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61D21m System		23		4

Select ‘Internet Protocol (TCP/IP)’ and click on ‘Properties’.
Select ‘Use the following IP address’ and enter IP address (192.168.100.220)
and subnet mask (255.255.255.0), as shown above.
Click ‘OK’ to close the Internet Protocol (TCP/IP) Properties dialog box.
In the Local Area Connection box, select the ‘Advanced’ tab at the top, andthen click on the Windows Firewall ‘Settings’ button:						NoteCobraNet Discovery Setup

Make sure the firewall is set to ‘Off’.
Click OK in the following dialogs to exit the Local Area Connection properties.
You will have to reverse the above settings 1-4 if you subsequently need toconnect the PC to a business LAN, so it is recommended to use a separate
network port, if available.

1Power up the console and connect the PC’s Ethernet port to the Primary porton the CobraNet card. This should be done with a ‘crossover’ Ethernet cable.
Depending on the PC, a ‘straight’ cable may be used if the PC supports bothcable types (most recent PCs do).		 Alternatively, a network switch can be connected between the PC and theCobraNet card. In this case ‘straight’ cables would be used.		 Using a switch also enables several other CobraNet devices to be connectedto the PC at the same time as the console, and their configuration inspected
and changed if necessary to match the console.		 In case your system should contain BSS London components, make sure thatnone of their CobraNet parameters are changed using CNDiscovery.

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D21m System		2Both LEDs on the CobraNet card should start flashing when connected to thePC.
Start the CobraNet Discovery program and go to ‘Tools/Options’.								In the ‘Network Adapter’ section of the dialog, select the network controllerthat your PC uses for the Ethernet port to which the CobraNet card is connected.
In the ‘IP Address Range’ enter values as above (Start: 192.168.100.101; End:192.168.100.199), and check the ‘Enable Auto Assignment box’.
Click OK and return to the main Discovery window.

NoteThis step must only be performed when you connect to the CobraNet card forthe first time.

3

You should now see the CobraNet module in the Discovery window, with agreen ‘tick’ icon on the left and an IP address similar to that shown:				 The IP address is only used for connecting to the configuration computer.
The actual address does not matter, as long as it is in the same subnet as thePC’s Ethernet port. If you have followed the previous instructions correctly,
it will be.
4 To configure the CobraNet card, click on the CobraNet device to select it,then choose Tools/Configure, or just double-click the device.		 The Configuration box appears, showing the current bundle number setup.

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63D21m System				You will need to change the bundle configuration of either the CobraNet cardor the external equipment in such a way that the transmit (Tx) number of one
matches the receive (Rx) number of the other, in order to pass audio.

5The bundle numbers can now be changed as required by either directly editing the bundle number field, or selecting one of the four transmit or receive
bundles and clicking the ‘Configure’ button, which opens a more detailed‘Configuration’ dialog box:		

IMPORTANT!

The CobraNet card is factory-set to have four transmit bundles (32 channels),
but no receive bundles active.		

The number of transmit and receive channels is also set on the CobraNet card
PCB via DIP switches. These switches determine how many channels areavailable in the console’s Input/Output patch touchscreen pages. Therefore,
if the number of transmit and/or receive channels is changed from the default,
the DIP switches on the CobraNet card must also be changed to match.		 The SubFormat parameter allows the bit depth to be changed to match thenetwork. Please note that if changing this to 24 bits, it is not possible to use
all eight channels in the bundle.

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D21m System
6Changing latency, sample rate and card name:				Please do not change any fields different from the ones indicated below! Inparticular, the ‘Persistence’ box must never be unchecked, otherwise all setup
data will be erased.		 The ‘Advanced Configuration’ dialog box is used to set the latency andsampling rate of the CobraNet card (this is the parameter called ‘modeRateControl’). These must match the other devices in the network, otherwise thesystem will not work.		 Please note that with latency setting of 1.33 ms, only seven channels perbundle are allowed.
IMPORTANT!

The ‘Conductor Priority’ parameter must be left at a value of 255. This is thehighest priority and indicates that the console will always be the clock masterfor the entire network.		 If necessary, the ‘Name’, ‘Location’ and ‘Contact’ fields can be changed toidentify the console in more detail.		
Do not change any other fields!		
In particular, the ‘Persistence’ box must never be unchecked, otherwise all
setup data will be erased.
7		Setting the SNMP variables:
This is also done with the CobraNet discovery utility. Enable SNMP by selecting the check box under ‘Tools - Preferences’. A right-click on ‘Device - Configure’ will open a dialog in which you can perform the SNMP configuration.		

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65D21m System		Subtree
sync
sync
flash
conductor
transmitters.txTable.txEntry
transmitters.txTable.txEntry
transmitters.txTable.txEntry
transmitters.txTable.txEntry

The following default variables have to be modified:

Name
syncConductorClocksyncPerformerClockflashPersistEnable
condPriority
txChannel.1
txChannel.2
txChannel.3
txChannel.4

Value2020
1
255
1234Comment
External Master Clock with External Sample Synchronization
Esternal Master Clock with External Sample Synchronization
Makes parameters to be stored after power down
set to highest priority
Ch 1-8 are tx multicast bundle 1
Ch 9-16 are tx multicast bundle 2
Ch 17-24 are tx multicast bundle 3
Ch 25-32 are tx multicast bundle 4

When Finished

Please remember to reset the computer’s IP address, subnet mask and toreactivate the Windows Firewall.		

For more information on CobraNet parameters, please refer to www.cobranet.
info

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