Murata Electronics North America DNT24 Manual Do Utilizador
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DNT24 Integration Guide – 03/04/15
the next beacon. This signals the child radio that the slot is temporarily registered to it, allowing the child
to efficiently stream any remaining data to the base hop-by-hop until it is all sent.
to efficiently stream any remaining data to the base hop-by-hop until it is all sent.
If a child radio does not see its address in the next beacon following its transmission, it again randomly
selects an open slot and retransmits its data. During times when there are no open slots, a child radio
keeps its data queued and continues to look for an open slot in each beacon until at least one slot
becomes available. The access method the DNT24 uses is referred to as Ad Hoc TDMA.
selects an open slot and retransmits its data. During times when there are no open slots, a child radio
keeps its data queued and continues to look for an open slot in each beacon until at least one slot
becomes available. The access method the DNT24 uses is referred to as Ad Hoc TDMA.
2.5 DNT24 Addressing
Each DNT24 has a unique MAC address. The MAC address can be read or bar-code scanned from the
label on top of each radio. A DNT24 radio in any mode (base/router/remote) can be addressed using its
MAC address. A DNT24 base can be addressed using either its MAC address or address 0x000000. A
DNT24 can send a message to all other DNT24’s in its system by using the broadcast address 0xFFFFFF.
label on top of each radio. A DNT24 radio in any mode (base/router/remote) can be addressed using its
MAC address. A DNT24 base can be addressed using either its MAC address or address 0x000000. A
DNT24 can send a message to all other DNT24’s in its system by using the broadcast address 0xFFFFFF.
The base and all routers (parents) hold base-mode network IDs, which are transmitted in every beacon.
All routers and remotes hold parent network IDs and optionally alternate parent network IDs to compare
against the base-mode network IDs in the beacons they receive. A child router or remote is allowed to
join a parent if its parent network ID or alternate parent network ID matches the parent’s base-mode net-
work ID, or with any parent when its parent network ID is set to 0xFF (wildcard).
All routers and remotes hold parent network IDs and optionally alternate parent network IDs to compare
against the base-mode network IDs in the beacons they receive. A child router or remote is allowed to
join a parent if its parent network ID or alternate parent network ID matches the parent’s base-mode net-
work ID, or with any parent when its parent network ID is set to 0xFF (wildcard).
In a point-to-point or point-to-multipoint system, the default base-mode network ID of 0xFF (wildcard) can
be used. In a store-and-forward system, however, the base-mode network IDs of all routers must be set
to different values between 0x00 to 0x3F. If the base-mode network ID of 0x00 is assigned to a router, the
base must be assigned an unused base-mode network ID between 0x01 and 0x3F. Leaving all parent
network IDs in a store-and-forward system set to the default value of 0xFF allows networks to automati-
cally form, and self-repair if a parent router fails. Enabling the alternate parent network ID also provides
self-repairing message routing.
be used. In a store-and-forward system, however, the base-mode network IDs of all routers must be set
to different values between 0x00 to 0x3F. If the base-mode network ID of 0x00 is assigned to a router, the
base must be assigned an unused base-mode network ID between 0x01 and 0x3F. Leaving all parent
network IDs in a store-and-forward system set to the default value of 0xFF allows networks to automati-
cally form, and self-repair if a parent router fails. Enabling the alternate parent network ID also provides
self-repairing message routing.
All DNT24 radios hold a system ID that can be used to distinguish systems that physically overlap. In a
DNT24 system, the system ID must be different from those used by overlapping systems to provide mes-
sage filtering. Also, using different base-mode network IDs for all networks in overlapping systems helps
reduce hopping pattern collisions.
DNT24 system, the system ID must be different from those used by overlapping systems to provide mes-
sage filtering. Also, using different base-mode network IDs for all networks in overlapping systems helps
reduce hopping pattern collisions.
The store-and-forward path between the base and any other radio in a system can be determined by
reading the radio’s ParentMacAddress parameter. If this address is not the base, then reading the Parent-
MacAddress parameter of its parent, grandparent, etc., in succession reveals the complete path to the
base. Path determination is useful in optimizing and troubleshooting systems during commissioning and
maintenance.
reading the radio’s ParentMacAddress parameter. If this address is not the base, then reading the Parent-
MacAddress parameter of its parent, grandparent, etc., in succession reveals the complete path to the
base. Path determination is useful in optimizing and troubleshooting systems during commissioning and
maintenance.
2.6 Network Linking and Slot Registration
When first turned on, a DNT24 router or remote rapidly scans all frequency channels in its operating band
to acquire synchronization and link to a parent based on a system ID match plus a base-mode network ID
to parent network ID/alternate parent network ID match (or by using a wildcard (0xFF) parent network ID).
to acquire synchronization and link to a parent based on a system ID match plus a base-mode network ID
to parent network ID/alternate parent network ID match (or by using a wildcard (0xFF) parent network ID).
In addition to the slot status and the MAC addresses of child radios holding slot registrations, each base-
mode beacon includes one of a number of cycled control parameters. The cycled parameters are collect-
ed by child radios, allowing them to register with a parent, and to later follow any control parameter
mode beacon includes one of a number of cycled control parameters. The cycled parameters are collect-
ed by child radios, allowing them to register with a parent, and to later follow any control parameter