User's Manual

Protocol Operation
Crescendo UHF Half-Duplex User Manual Page 42 of 78
Hayes dial-up
Connection
established
Connected if a path exists between the
local and remote device. Not Connected
if there is no communications path.
No connection
established
Not Connected
Datagram
N/A
Table 17: RF link status for different protocol modes
Whenever the protocol mode on a serial port is temporarily disabled (such as when the menu is enabled on
the port, or when the Cruise Control application has been started), the RF Link Status will be displayed as
N/A.
6.10 Protocol to Radio Address Mapping
Protocol address mapping can be used in situations where the radio address is not the same as the protocol
address, or where there is more than one protocol address for each radio address. A protocol mapping entry
has each of the following fields:
 First Addr: The first protocol address to apply to the protocol mapping.
 Last Addr: The last protocol address to apply to the protocol mapping.
 Radio Addr: The radio address to apply to the protocol mapping.
 Type: A protocol mapping entry can be one of four types:
o Unused: The protocol mapping entry is not used.
o Single: For a single entry, the packet is sent to the associated radio address if the protocol
address matches the first address. The last address is ignored. This is a “one-to-one” mapping.
o Mapped: For a mapped entry, the mapping is applied if the protocol address is within the range
specified by the first and last addresses. To determine the radio address, the offset from the first
address is added to the associated radio address entry. This is a series of “one-to-one” mappings.
o Grouped: For a grouped entry, the packet is sent to the associated radio address if the protocol
address is within the range of the first and last address. This is a “many-to-one” mapping.
An example protocol mapping table is shown in Figure 12.
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