General Dynamics LT-3600 Manual De Usuario

Integrated L-Band Up/Dn Converter

 

LT3600

 

 

 

 

 

 Page 20 

 

SECTION 4 

Serial Command Set 

 
4.0 GENERAL 

The standard Up/Dn Converter is controlled via a rear panel serial link (RS-422/485)(Reconfigurable 
to RS-232). With the front panel control, a user can operate the L-Band Up/Dn Converter from its 
front panel as well as from the serial link. This section describes the format for the ASCII serial 
control as well as front panel operation. 
 
Note: Some commands and status strings have been changed as of Software Release v7.70 (main 
board) and v5.20 (front panel).  Units marked with “Rev A” on the rear panel support the new 
protocol. 
 

The serial interface format to the Up/Dn Converter for RS-422 is identical to the RS-485 format 
except that under RS-485, the format includes an address field (aa in the format below). 
 

 
Baud Rate: 

9600 

Parity:  

None 

Data Bits: 

Eight 

Start Bits: 

One 

Stop Bits: 

One 

 

4.2.1 General Data Format 

{aaCND…} 

 

Where: 
 

{ 

= Start byte 

 

aa 

= 2 character address (00 to 50, remote interface only) 

 

C 

= 1 character, either C (Command) or S (Status) 

 

N 

= 1 number 0 to 9, A,B,C Command or Status Number 

 

D 

= 1 or more Data characters (depending on command) 

 

} 

= Stop byte 

 
Note: The address is only used in the RS-485 mode when having several addressable units 
communicating with one station.