SG-2000 MANUAL
117
The SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
©1995, SGC, Inc.
TEL: (206) 746-6310 FAX: (206) 746-6384
The RESET command (80) is issued as power up and whenever the ALE
controller is switched between on-line and off-line conditions.
The STORE command (84) is utilized to upload frequency and mode data into a
selected memory within the SG-2000 for future recall. This command is issued
whenever the system operator changes a channel memory value from within the
"Channels" menu on the ALE terminal.
The RECALL command (81) is the most commonly used command when the SG-
2000 is under ALE control. It is typically issued two to five times per second as
the ALE controller directs scanning through a selected group of channels. It is
also issued during ALE calling as the controller will automatically attempt to
select the best channel for an ALE link, using as its decision authority, the output
from the Link Quality Analysis portion of the controller.
4.
Command parameters (if any). These bytes contain further data which
may be required by a particular command - such as Channel and
Frequency values for the STORE command.
5.
Checksum. This consists of a single 8 bit value which is created by adding
together the values of command code and all command parameter bytes.
Note that this value is not to be included in the total count of bytes
specified within the ID/Byte Count number.
18.3
ALE Controller - Command Examples
Example 1:
To reset or restore radio:
01
80
80
ID/Count
Reset
Check-
1 byte Command
sum
Example 2:
To STORE Tx/Rx Data into a selected user definable memory within the
SG-2000:
[0A]
[84]
[15
00]
[56
34
12]
[56
34
12]
[44]
[15]
ID/Cnt Store
Channel
Rx Frequency
Tx FrequencyMode Check
10 Bytes Cmd
(15 shown)
(12.3456 MHz.)
(12.3456 MHz.)(USB) sum