Teledyne t320u Manuale Utente

Communications Setup and Operation 

Teledyne API – Model T300/T300M CO Analyzer 

144 

6.2.1. COMMUNICATION MODES 

Either of the analyzer’s serial ports (RS232 or COM2 on rear panel) can be configured 
to operate in a number of different modes, which are described in Table 6-1.  As modes 
are selected, the analyzer sums the mode ID numbers and displays this combined 
number on the front panel display.  For example, if quiet mode (01), computer mode 
(02) and Multidrop-Enabled mode (32) are selected, the analyzer would display a 
combined MODE ID of 35.   

Quiet mode suppresses any feedback from the analyzer (such as warning messages) to 
the remote device and is typically used when the port is communicating with a computer 
program where such intermittent messages might cause communication problems.   
Such feedback is still available but a command must be issued to receive them. 

Computer mode inhibits echoing of typed characters and is used when the port is 
communicating with a computer operated control program. 

The Hessen communications protocol is used in some European countries. TAPI P/N 
02252 contains more information on this protocol. 

When turned on this mode switches the COMM port settings from 

● 

NO PARITY; 8 data bits; 1 stop bit  to  EVEN PARITY; 8 data bits; 1 stop bit.

 

When turned on this mode switches the COM port settings from 

● 

NO PARITY;  8 DATA BITS; 1 stop bit  to  EVEN PARITY;  7 DATA BITS; 1 stop bit.

 

Configures the COM2 Port for RS-485 communication.  RS-485 mode has precedence 
over multidrop mode if both are enabled. 

When enabled, the serial port requires a password before it will respond (see Section  
5.5).  If not logged on, the only active command is the '?' request for the help screen. 

Multidrop protocol allows a multi-instrument configuration on a single communications 
channel.  Multidrop requires the use of instrument IDs. 

Enables to send a modem initialization string at power-up.  Asserts certain lines in the 
RS-232 port to enable the modem to communicate. 

Fixes certain types of parity errors at certain Hessen protocol installations. 

Disables XON/XOFF data flow control also known as software handshaking. 

Enables CTS/RTS style hardwired transmission handshaking.  This style of data 
transmission handshaking is commonly used with modems or terminal emulation 
protocols as well as by Teledyne Instrument’s APICOM software. 

Disables the HARDWARE FIFO (First In – First Out). When FIFO is enabled it improves 
data transfer rate for that COM port. 

Enables a command prompt when in terminal mode. 

1

 Modes are listed in the order in which they appear in the  

SETUP  MORE  COMM  COM[1 OR 2]  MODE menu 

2

 The default setting for this feature is ON.  Do not disable unless instructed to by Teledyne API’s Customer Service 

personnel. 

  

06864B DCN6314