Teledesign Systems Inc TS4000EH Manuel D’Utilisation

 
During normal operation, the frequency channel can be switched on the fly with: 

1)  A control String through either serial port. 
2)  The DTR and RTS control lines on serial port 2. For details, see Radio 

Setup – Frequency Channel at Power Up. 

3)  Automatically with the Clear Channel Scan function.  For details, see 

Radio Setup – Frequency Channel at Power Up. 

 
 
The channel is switched by sending the following ASCII character string to either 
of 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. 
 
 

+TSC?   

 

Note: The letter characters must be upper case.   

 
The response string is sent out the serial port and is as follows. 
 
 1) 

+TSCxx   

 

For single channel systems 
Where: xx = Channel number from 01 to 99 

 2) 

+TSCCS  

 

For modems configured for clear channel scan 

 
If a frequency channel is selected that has not been programmed with valid 
frequencies, the modem will not receive or transmit and the RX and TX lights will 
alternately flash. 
 
The channel that the TS4000 activates at power up depends on the setting of the 
Frequency Channel at Power Up control (see Radio Setup – Frequency Channel 
at Power Up).