Murata Electronics North America CCT24 Manual De Usuario
Page 8 of 90
CCT24
configured to send join announcements to a host application for an unlimited number of radios. The
application can then verify the continued presence of each radio in the network through periodic polling.
application can then verify the continued presence of each radio in the network through periodic polling.
The CCT24 also supports a RemoteLeave command that allows a host application to release a radio from
the network. This is useful to remove any rogue radios that may have joined then network when authenti-
cation is not being used. It is also useful to remove remotes from the network once they have been ser-
viced by the application. The RemoteLeave command includes the amount of time the radio must leave
the network, which can be set from 2 seconds to more than 36 hours. In addition, a radio can be told to
leave and not rejoin until it has been power-cycled or reset. The base can use RemoteLeave to keep
track of remotes that have not yet been serviced, allowing networks of more than 126 remotes to be
indirectly tracked by the base.
the network. This is useful to remove any rogue radios that may have joined then network when authenti-
cation is not being used. It is also useful to remove remotes from the network once they have been ser-
viced by the application. The RemoteLeave command includes the amount of time the radio must leave
the network, which can be set from 2 seconds to more than 36 hours. In addition, a radio can be told to
leave and not rejoin until it has been power-cycled or reset. The base can use RemoteLeave to keep
track of remotes that have not yet been serviced, allowing networks of more than 126 remotes to be
indirectly tracked by the base.
2.2 Authentication
In many applications it is desirable to control which radios can join a network. This provides security from
rogue radios joining the network and simplifies network segregation for co-located networks. Registration
is controlled by the AuthMode parameter in the base. The AuthMode parameter can be set to one of four
values, 0..3. The default value is 0, which allows any remote or router to register with a base.
rogue radios joining the network and simplifies network segregation for co-located networks. Registration
is controlled by the AuthMode parameter in the base. The AuthMode parameter can be set to one of four
values, 0..3. The default value is 0, which allows any remote or router to register with a base.
When the AuthMode parameter is set to 1, a radio’s address must be listed in Parameter Bank 7 before it
will be allowed to register with the base. This is referred to as base authentication. Bank 7 must be pre-
loaded with the addresses of the authorized remotes before using base authentication. If a radio whose
MAC address is not in Bank 7 attempts to join the network the base will deny the registration request. A
maximum of 16 remotes can be entered into Bank 7. To support larger networks, mode 2 must be used.
will be allowed to register with the base. This is referred to as base authentication. Bank 7 must be pre-
loaded with the addresses of the authorized remotes before using base authentication. If a radio whose
MAC address is not in Bank 7 attempts to join the network the base will deny the registration request. A
maximum of 16 remotes can be entered into Bank 7. To support larger networks, mode 2 must be used.
When the AuthMode parameter is set to 2, the address of a radio attempting to register with the base is
sent to the host for authentication in a JoinRequest message. The host application determines if the radio
should be allowed to register and returns a JoinReply message to the base containing a PermitStatus
parameter that allows or blocks the radio from registering. The host application has 30 seconds in which
to respond, after which time the base denies registration to the radio. Up to 16 join requests can be
pending at any one time. If more than 16 radios are asking to join, the first 16 will be serviced and addi-
tional radios will be serviced after the earlier requests are handled. The RegDenialDelay parameter
controls how often a radio will request registration after it has been denied. If it is anticipated that more
than 16 radios will request registration before the application can service the first 16, this parameter
should be set to the time it will take the application to service four requests, as this will speed the authen-
tication process by freeing the base from issuing multiple denials to the same remotes.
sent to the host for authentication in a JoinRequest message. The host application determines if the radio
should be allowed to register and returns a JoinReply message to the base containing a PermitStatus
parameter that allows or blocks the radio from registering. The host application has 30 seconds in which
to respond, after which time the base denies registration to the radio. Up to 16 join requests can be
pending at any one time. If more than 16 radios are asking to join, the first 16 will be serviced and addi-
tional radios will be serviced after the earlier requests are handled. The RegDenialDelay parameter
controls how often a radio will request registration after it has been denied. If it is anticipated that more
than 16 radios will request registration before the application can service the first 16, this parameter
should be set to the time it will take the application to service four requests, as this will speed the authen-
tication process by freeing the base from issuing multiple denials to the same remotes.
When the AuthMode parameter is set to 3, authentication is locked to the addresses of the radios current-
ly registered with the base. Mode 3 is typically used in conjunction with Mode 0 during a commissioning
process. AuthMode is set to 0, radios are turned on and allowed to register with the base, and AuthMode
is then switched to 3 to lock the network membership.
ly registered with the base. Mode 3 is typically used in conjunction with Mode 0 during a commissioning
process. AuthMode is set to 0, radios are turned on and allowed to register with the base, and AuthMode
is then switched to 3 to lock the network membership.
2.3 Serial Port Modes
CCT24 radios can work in two data modes on the primary serial (UART) port: transparent and packet
protocol. Transparent mode formatting is simply the raw user data. Protocol mode formatting includes a
start-of-packet framing character, length byte, addressing, command bytes, etc. Transparent mode opera-
tion is especially useful in point-to-point systems that act as simple cable replacements. In point-to-
multipoint, peer-to-peer and tree-routing systems where the base needs to send data specifically to each
protocol. Transparent mode formatting is simply the raw user data. Protocol mode formatting includes a
start-of-packet framing character, length byte, addressing, command bytes, etc. Transparent mode opera-
tion is especially useful in point-to-point systems that act as simple cable replacements. In point-to-
multipoint, peer-to-peer and tree-routing systems where the base needs to send data specifically to each