DATA-LINC GROUP
12
PN 161-09990-002C
rev 3/29/04
SRM6200E-SLC User’s Guide
Main Menu Option (3): Edit Radio Transmission Characteristics
When option (3) is selected in the main menu, the screen in figure 4 appears, which allows the user to modify the radio
transmission characteristics of the radio modems. As stated in the warning, these parameters are for the experienced user
who has a good understanding of the principles of radio data transmission. They should be changed only after consulting this
manual.
It is important to note that the radio parameters between any radio modems in communication will be determined by the
settings for the Master (except when in multi-point mode, see (4) RF Data Rate and (5) RF Power below). While the settings
may be modified for the Remote(s) and/or Repeaters, they will be overridden by the Master’s parameters.
Note: For most Ethernet applications, these settings are already optimized. Please consult with Data-Linc Group
before making changes.
Figure 4: Radio Parameters Menu
Shown below are example settings. Please refer to supplied configuration sheets for your modem’s configuration.
(0) FreqKey
Selection (0) in the Radio Parameters menu allows the user to modify the hopping patterns of the radio modems to
minimize the interference with other SRM6200E-SLC radio modems in operation in the area. For instance, if there were
10 pairs of SRM6200E-SLCs in operation within a factory or refinery, changing the Frequency Key would ensure that
they would not jump onto the same frequencies at the same time for the same length of time.
There are 15 choices available for the Frequency Key (0-9 and A-E). It is recommended that a list be maintained of the
settings for each master to ensure that each is set to a different hopping pattern.
(1) Max Packet Size and (2) Min Packet Size Selections
(1) and (2) allow the user to designate the size of the packets (in bytes) used by the radio modem in its communications
link. This may be of particular value when using the SRM6200E-SLC with different communications software packages;
you may find that throughput is optimized when packet sizes are restricted by the radio modem.
Packet size is determined by a combination of the settings entered by the user and the RF Data Rate. In addition, the
Max Packet Size is a function of the setting selected for the Min Packet Size. Tables 2, 3 and 4 provide the packet
sizes for each different combination of settings.
