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the destination address is then checked to determine whether the message
should be forwarded or dropped. The forwarding flags are all cleared whenever
the router is reset, so the learning process restarts after a reset.
The forwarding flag for a given subnet should never be cleared on both sides of a
router. However, the flag can be cleared on both sides if a device is moved from
one side of a router to the other side. For example, if subnet 1 is located on side
A of a router, the router will learn subnet 1’s location as soon as it receives a
message generated by any device in subnet 1. If any subnet 1 device is moved to
side B without reinstalling it, the router will learn that subnet 1 is also on side B,
and will stop forwarding subnet 1 messages to side A. The router detects this
error and logs it, as described in Chapter 7, Network Management Messages.
Router receives
message packet
Is message addressed
to either of the router’s
domains?
Is message domain
length zero,
source
subnet zero
, addressed
as broadcast?
Drop packet
Is message source
subnet zero
?
Is message domain
length zero
,
addressed
as broadcast?
Clear subnet fwd flag
Set message source subnet
=
router subnet
Substitute one or both
domains from the router
,
source subnet = our
subnet, dest subnet zero
Forward one or two
packets
No
Yes Yes
Yes
No
Yes
No No
Page 2
*
Applies to
learning
router only
Figure 4. Configured and Learning Router Forwarding Rules, Part 1
L
ONWORKS Router User’s Guide 11
- LONWORKS 1
- Router 1
- User’s Guide 1
- Welcome 3
- Audience 3
- Related Documentation 3
- Getting Support 4
- FCC Notice 5
- VDE Notice 5
- Canadian DoC Notice 5
- Table of Contents 7
- ONWORKS Routers 11
- LONWORKS Router Products 13
- RTR-10 Overview 14
- ONWORKS 15
- LonWorks Router Based on the 17
- Router 5000 17
- FT Router 5000 17
- ONWORKS router 18
- Router Types 19
- Repeater 19
- Configured Router 19
- Learning Router 20
- Channel A 23
- Router 1 Router 2 23
- Channel B 23
- Power Line Routers 23
- PL Phase A 24
- PL Phase B 24
- Message Receiving Side 25
- Message Sending Side 25
- Direction of Message Flow 25
- Router Performance 28
- LONWORKS Router Electrical 31
- Interfaces 31
- Overview 32
- Electrical Interface 32
- RTR-10 Electrical Interface 32
- ACLK2, BCLK1, and BCLK2 34
- ACP[4..0] and BCP[4..0] 34
- ASVC~ and BSVC~ 34
- AXID[4..0] and BXID[4..0] 34
- Note: RTR-10 Modules 36
- SERVICE~ 37
- Router 5000 Pinout 37
- FT Router 5000 Pinout 39
- Clock Pins (XIN and XOUT) 42
- CP[4..0] – Router 5000 Only 44
- IO[11..0] 46
- SCL, and SDA_CS1~) 47
- Power and Ground 47
- RX Activity Indicator 54
- TX Activity Indicator 54
- Power Requirements 55
- RTR-10 Power Requirements 55
- Low Voltage Protection 56
- LONWORKS Router Mechanical 59
- Developing a LONWORKS Router 65
- Using Custom Transceivers 68
- Differential Driver Circuit 71
- Comparator Circuit 72
- Using an EIA-485 Transceiver 74
- Using an FTT-10A Transceiver 75
- GROUND GUARD 77
- Input Output 89
- NodeBuilder Device Template 91
- Buffer Configurations 92
- Example Neuron C Source 93
- ONWORKS Router Design Issues 95
- PCB Layout Guidelines 96
- Power Supply 97
- Circuitry 97
- EMI Design Issues 99
- Compatibility) 99
- EMC Design Tips 99
- ESD Design Issues 100
- Installing a LONWORKS Router 103
- Introduction 104
- Defining a Network Topology 104
- Connecting Power 105
- Messages 106
- Testing Router Installation 107
- Network Management Messages 109
- Standard Messages 110
- Router-Specific Messages 111
- Set Router Mode 112
- Group Forward 113
- Subnet Forward 114
- Group No Forward 114
- Subnet No Forward 114
- Router Status 115
- Far Side Escape Code 116
- Set Routing Algorithm 116
- Set Buffer Size 116
- LONWORKS Routers 119
- Communications Parameters 120
- Determining RTR-10 Firmware 127
- Version 127
- Router Firmware Version 128
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