X8200 Datasheet, PDF (15/19 Pages) rfsolutions.ltd – Synthesised Radio Modem

Synthesised Radio Modem
X8200
X8200HP
ID numbers if a repeater path is to be used.
Data from the Host is stored in the modem memory. When the number of data bytes equals
the number set in Packet Size or if there is a gap detected in the incoming data the CTS line is
brought low. This line is connected to RTS on the Host and stops the data. A check sum is
added to the data string and it is then transmitted over air.
The data string is checked at the receiving modem and if no corruptions have taken place an
Acknowledge is sent to the transmitting modem. This then takes the CTS line high and the
sequence is repeated.
If the receiving modem detects a data corruption a Not Acknowledge is sent to the transmitting
modem and the data is sent again. The number of retries at set in the menu.
Number of Retries
The number of retries before the data is abandon can be set between 0 and 99 using the
horizontal arrow key.
Packet Size
The number of data bytes in the data packet can be set by the following number:
2 = 64 Bytes
4 = 128 Bytes
8 = 256 Bytes
10 = 512 Bytes
20 = 1024 Bytes
Logger Mode
The modem will place all data from the host into its 4K buffer memory. When it receives an
addressed message from a distant modem all the contents of the memory will be transmitted.
Enable Remote Access
Enable Remote Access is set so that a local modem can access, monitor or change the
settings of a distant modem over the radio link.
Access Remote Modem.
The radio link can be used to display the menu of a remote modem. All the parameters can be
changed including the RF Frequency and the RF Power. In addition the value of the receiver
signal strength will be radio back.
First set the ID number of the target modem in the first location of the Repeater Path by
pressing the horizontal arrow until the number is arrived at. Press the Enter Key. If the ID
number is not known then 99 can be used as a universal entry code. Please note that using 99
will address all the Radio Modems within radio range.
Move the cursor to Access Remote Modem, press the horizontal arrow key to select Y. Then
press the Enter Key. The menu from the target modem will be displayed along side the local
modem.
Any and all the parameters can be altered using the arrow keys. In addition the signal strength
DS8200-2 April ’07
©2007 RF Solutions Ltd, www.rfsolutions.co.uk
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