Teledyne t320u Manual Do Utilizador

Teledyne API – Model T300/T300M CO Analyzer 

Communications Setup and Operation 

instruments are regarded as slaves of the host computer.  The remote instruments are 
unaware that they are connected to a multidrop bus and never initiate Hessen protocol 
messages.  They only respond to commands from the host computer and only when they 
receive a command containing their own unique ID number. 

The Hessen protocol is designed to accomplish two things: to obtain the status of remote 
instruments, including the concentrations of all the gases measured; and to place remote 
instruments into zero or span calibration or measure mode.  API’s implementation 
supports both of these principal features.   

The Hessen protocol is not well defined, therefore while API’s application is completely 
compatible with the protocol itself, it may be different from implementations by other 
companies. 

6.7.2.1. HESSEN COMM PORT CONFIGURATION 

Hessen protocol requires the communication parameters of the T300/T300M Analyzer’s 
COMM ports to be set differently than the standard configuration as shown in Table 6-4. 

Baud Rate 

300 – 19200 

1200 

Data Bits 

8 

7 

Stop Bits 

1 

2 

Parity 

 

None Even 

Duplex Full 

Half 

To change the baud rate of the T300/T300M’s COMM ports, see Section 6.2.2. 

To change the rest of the COMM port parameters listed in Table 6-4, see Section 6.2 and 
Table 6-1. 

 

06864B DCN6314