Cirrus-logic CobraNet User Manual Page 12
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12 ©Copyright 2006 Cirrus Logic, Inc. DS651PM25
CobraNet Programmer’s Reference
Control Communications
2. Control Communications
2.1 Serial Bridge
Asynchronous serial data may be bridged across the network using the serial bridge
hardware and software. The CobraNet interface has a two wire logic-level asynchronous
interface. Characters received on the interface are buffered and placed in the payload of a
special serial bridge Ethernet packet. The packet is then transmitted onto the network
with unicast or multicast addressing as configured. It is received at the destination
CobraNet interface where the data in the packet is re-serialized and presented on the
serial interface. Many standard asynchronous serial formats are supported. With proper
physical interface circuitry, this port can be made to support RS-232, RS-422 or RS-485
standards. Multi-drop two-wire interfaces are also supported.
The bridging feature can be useful in a CobraNet product as either an internal or external
control interface. Used externally, the appropriate transceiver, such as an RS-232 driver
chip, is connected to the logic-level pins and in turn connected to a standard connector,
such as a DB-9 or DB-25, on the back panel. This allows control of external serial
interfaced devices remotely over Ethernet.
Figure 2. Serial Bridging, External Application
Internal application of the serial bridge allows serial communications over the network
between host processors which are incorporated into CobraNet devices. Using this
communication scheme reduces engineering effort in integrating CobraNet into audio
products that already accomplish control communications via serial link.
CobraNet
Interface
Ethernet
Network
CobraNet
Interface
RS-485
Multi-drop
N
etwor
k
RS-232
Connection
Ethernet
Network
CobraNet
Interface
Micro-
controller
CobraNet
Interface
Micro-
controller
Figure 3. Serial Bridging, Internal Application
- CobraNet 1
- Features 2
- General Description 3
- Table of Contents 5
- Table of Contents 6
- 1. Overview 7
- Overview 8
- 1.2 Protocol 9
- 1.3 Timing and Performance 10
- 1.4 Bundle Addressing types 11
- 2. Control Communications 12
- 2.2 Packet Bridge 13
- 3. Network Stack 16
- 3.5 RARP (partial support) 17
- 3.6 ICMP (partial support) 17
- 3.10 TFTP 18
- 3.11 SNMP 18
- 4. Audio Paths 19
- 4.2 Bundle Transmitters 20
- 4.3 Bundle Receivers 20
- 4.4 Loopback 20
- 4.6 Meters 21
- Latency 22
- Channels per Bundle 22
- 5. Management Interface 25
- 5.2 Persistence 26
- 5.3 Watch Dog 26
- 5.4 SNMP Extension Agent 27
- 6.1 Legend 28
- 6.2 Data Types 29
- 6.2.4 PhysAddress 30
- 6.2.5 TimeTicks 30
- 6.2.6 Counter 31
- 6.2.7 Counter2 31
- 6.2.8 Integer 31
- 6.2.9 Integer16 32
- 6.2.10 Integer48 32
- 6.3 MIB-II Variables 33
- 6.3.2 Interface 37
- 6.3.3 Address Translation 45
- 6.3.4 IP 46
- 6.3.5 UDP 53
- 6.3.6 SNMP 55
- 6.4 CobraNet Variables 65
- 6.4.2 Hardware Identification 68
- 6.4.3 Flash 69
- 6.4.4 Errors 74
- 6.4.5 Conductor 77
- 6.4.6 Conductor Information 79
- 6.4.7 Packet Bridge 81
- 6.4.8 Serial Bridge 86
- 6.4.9 Interrupt Control 89
- 6.4.10 Audio 92
- 6.4.11 Receivers 101
- 6.4.12 Transmitters 105
- 6.4.13 Synchronization 110
- 6.4.14 SNMP Monitor 113
- 6.4.15 MI Monitor 114
- 6.4.16 IP Monitor 116
- 6.4.17 IF Monitor 117
- 6.5 DSP Extensions 119
- SNMP Object ID 120
- 7.1.1 Audio I/O Map 122
- 7.1.2 Bundle Assignments 122
- 7.2 Conductor Priority 123
- 7.3 Name 123
- 8. Error Reporting 124
- 8.2.2 POST Failure 125
- 9. Error Code Reference 126
- 9.2 Error Code Interpretation 127
- 9.3 Error Codes Listing 128
- 10. Glossary of Terms 141
- Glossary of Terms 142
- Unicast Bundle 146
- Unregulated Traffic 146
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