Hessen; Hessen Com Port Configuration; Figure 3-3. Serial Communication, Setting Hessen Protocol - Teledyne T400 User Manual

Photometric ozone analyzer with numaview software

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3.4.2

ESSEN

Hessen is a multidrop protocol, in which several remote instruments (slaves) are

connected via a common communications channel to a host computer. Slaves respond

only to commands sent by the host using their unique identification.

Important

The Hessen protocol is not strictly defined; therefore, while Teledyne API's application

is completely compatible with the protocol itself, it may be different from

implementations by other companies.

Configure

Setup>Comm>COM1[COM2] menu: select COM1[COM2] Protocol and press Edit to

select HESSEN, then press Accept.

Ensure that the communication parameters of the host computer are also properly set.

Note

Create a unique identification number for each

instrument in the multidrop chain via the

Setup>Vars>Instrument ID menu.

the

COM1/COM2

port

The instrument software has a 200 ms latency period

before it responds to commands issued by the host

computer. This latency should present no problems, but

be mindful of issuing commands to the instrument too

Teledyne API – Model T400 O

for

Hessen

protocol

Analyzer

through

the

083730400A DCN8130

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