RF Innovations RFI-9256, Руководство по эксплуатации, Страница: 92 / 107

T R O U B L E S H O O T I N G
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© RF Innovations Pty Ltd, 1998 Page: 90
223889, Revision 2.2
E Trouble Shooting
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“I have two transceivers, one configured as a master and the other as a slave. When they are plugged in, the POWER
LED indicates they are receiving power, and yet they will not LINK. Why not?”
There are many reasons why two modems will not LINK. First of all, make sure that the two modems
have the same ‘Network Address’, ‘Hopping Pattern’, ‘Frame Time’ and finally, the same protocols (all
these settings can be changed in the menu interface). If any one of these is different you will not get a
LINK between the modems.
Point-to-Multipoint Dialup Connection: If you are using the Hayes ™ AT commands to connect to
other modems make sure you include the extension number in the dialing command. For example, if
you want to connect to the Slave modem with ‘Local Rx Address’ 4022 from the Master modem with
‘Local Rx Address’ 20, you would execute the following command:
“ATDT402200” - where ‘ATDT’ is the Hayes ™ command ‘4022’ is the slaves address and
‘00’ is the extension number.
This will connect the Master modem with the Main Port of the Slave modem.
Point-to-Point Connection: If you have a Point-to-Point Connection then you have to make sure that
the ‘Remote Tx Address’ corresponds to the ‘Local Rx Address’ of the other modem. For example, if
the Master is configured with ‘Local Rx Address’ of 20 and the Slave with its ‘Local Rx Address’ equal
to 4022, the Master would have its ‘Remote Tx Address’ set to 4022 and the Slave’s ‘Remote Tx
Address’ set to 20. In order to set the ‘Remote Tx Address’ you have to select ‘Point-to-Point
Connection’ in the ‘Radio Configuration Menu.’
Final Notes: If all else fails, you can restore the modems to their factory defaults by selecting the
option in the ‘Radio Configuration Menu’ and set up the connection by following the steps in Installation
at the beginning of this manual. If you require a specialized connection please contact your supplier for
further assistance.
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“I am able to link to a remote unit within line of sight when the Transceiver I have is outside. However, as soon as I
walk inside with it I lose the link, even if I place the Transceiver by the window which faces the remote unit.”
Many modern buildings use energy efficient glass that wreaks havoc on RF signals. This glass contains a
metal film that is very effective in blocking all radio waves. If your situation is as described above the
preferable solution is to install an antenna outdoors.
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“My transceivers have established a solid connection as indicated by the LEDs, yet the application I am running is not
transmitting and/or receiving data correctly.”
A quick acid test in a situation like this is to try to get the application up and running using an RS-232
null modem cable before deploying the RFI-9256 in the field. The RFI-9256 essentially functions as a
null modem cable. If the application will not work with a hard wire connection then it will not work
with the RFI-9256, and the problem lies within the application or other hardware (such as the computer
serial ports or flow control).