User guide

16 1892 1139 - RSX Range of Intelligent Modems User Guide - v7.1 / Nov 2007
2.2.3.1 Reading Current Unit Settings
First, you must read into the computer what is in the unit’s memory at present. To do this,
press F5 or select Link > Read from the Unit > Upload All from SXn50G. The data
replaces the defaults on the screen and fills in the unit details.
v The program insists that you do this before allowing you to reprogram the unit to
make it less likely that inappropriate values be entered.
v However, once you have uploaded during a session, you may edit and download
the data to as many units as you wish.
If you just want to change the operational channel, skip to section Setting Operational
Channel on page 17.
2.2.3.2 Selecting Table Type
The SXn50G can hold either a table of 80 individually-chosen Tx frequencies and Rx
offsets, or a table of 256 equally-spaced Tx frequencies all with the same Rx offset.
To select the table type, select Parameters > Number of Channels > 80 or 256.
2.2.3.3 Programming 256 Channels as a Block
It is necessary to specify the starting frequency (the lowest, corresponding to channel 0),
a spacing or step value, and an Rx offset. The spacing is expressed in multiples of the
Comparison Frequency (including 0, which makes all frequencies the same).
Double-click the Tx Frequency value for channel 0 in the main frequency table, which
brings up this dialog:
Figure 14 - Frequency Programming Dialog
v The list displays all valid values for the starting frequency, that is, frequencies
within the switching bandwidth which are multiples of the Comparison Frequency.
Select a Table Start frequency from the list and a Table Step and click OK. The dialog is
removed and the main table shows the channel frequencies.