User`s guide

A receiving radio modem will only accept a data packet whose hop count is zero. It is
therefore essential that the correct hop count be specified in the modem configuration
for the number of expected repeater hops.
With rptmode being set to ALL, the repeater will retransmit all packets regardless of
the site address, provided the hop count for that packet is greater than or equal to 1.
Diagnosing Network Problems Using Ping Test
The radio modems have a built in test feature allowing the user to not only check that
the remote unit is operating, but to also check that there are no other radio modem
pairs using the same unit and site address.
Under normal operation data communications is between two radio modems with
identical unit and site addresses. If however, when setting up an additional radio
modem pair, you are not sure of what other unit addresses are in use within a
particular site code, then the ping function can assist in determining unused unit
addresses.
Only one radio modem is required to be in command configuration mode in order to
execute the ping function. When the ping command is executed, without parameters, it
sends out four successive ping requests using the current unit address and site code.
After each ping request the radio modem will wait for approximately 250 milliseconds
for a response from any remote device that matches the ping requests unit address
and site code.
Upon receiving a ping acknowledgement from any radio modem that is powered up
and listening, the remote modem’s details are displayed to the user. The details
reported to the user from the remote unit include, the baud rate setting, the serial
number, the number of repeater hops taken and the time taken for each reply.
Assuming that another radio modem pair are operating within radio range and using
the same unit address and site code, the results from the ping request will show the
details from those devices. It is then possible, using the returned serial numbers, to
identify the other radio modem pairs.
If a unit address is specified to the ping command, then this unit address is used for
the ping along with the current site code. It is therefore possible to ping all 16
addresses in a given site by just specifying the unit address with the ping command.
Note that a remote radio modem will not respond to a ping request if it is not powered
up or is in the power save mode (ie; DTR has put the radio modem into a power down
state).
Performing Site Reliability Tests Using Radar Test
The radio modems support a function that can be used for both site testing and range
testing the radio modems.
The radar test, once executed, sends out continuous requests to a remote addressed
radio modem at a predetermined rate. The remote radio modem must reply to these
requests within a certain time frame before that particular request is considered to
have failed.
The displayed results from the radar test indicate the rate of successful
acknowledgements received over the last 100 transmitted requests sent. It also counts
the number of failed requests (up to 65535, before wrapping around to zero).
User’s Guide Modem Operation Explained 4-10