Teledesign Systems Inc TS4000D User Manual

The minimum and maximum frequencies and the channel spacing depend on the
specific radio module in the TS4000.  The configuration program does not know
this information unless it is connected to the TS4000.  Therefore, these fields in
the Radio Settings frame only show up when the configuration program is
connected to the TS4000.  When the user creates a new frequency configuration
file these values can be set in the channel frequencies frame.  This allows the
user to create, modify and store frequency files without being connected to a
TS4000.  When a file is used to program frequency channels into the TS4000,
the configuration program compares the radio values with the file values and
determines if they are compatible.  If they are compatible then the programming
continues.  If they are not compatible then the user is prompted to make the
necessary changes in these values so that only valid frequency channels are
programmed into the TS4000.

During normal operation, the frequency channel can be switched on the fly.  The
channel is switched by transferring the following ASCII character string to the
TS4000’s serial port.

+TSCxx Where: xx = Channel number from 01 to 99

Note: The letter characters must be upper case.

The channel change control string is sent to the modem the same as standard
transmit data.  For the control string to be recognized it must be the first
characters of a burst of transmit data.  If the control string is sent alone (no data
following), then the TS4000 will switch to the receive frequency of the new
channel pair and wait in receive mode.  If the control string is sent with a transmit
data burst following it, then the TS4000 will switch to the transmit frequency of the
new channel pair and transmit the burst.

The active channel can be determined with the channel query string. This is done
with the following ASCII character string.