Chapter 1
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BB6032-14
Photoacoustic Gas Monitor
LumaSense Technologies
1314i / 1412i / 1512 / 3434i
Page 19 of 81
line (pin 6) off, the Monitor stops transmitting until DSR goes back on. If the
DSR line remains off for more than 30 seconds, the Monitor issues a time-
out warning.
If “None” is selected, handshaking is disabled.
If either “Hardwired” or “None” is selected and the external device attempts
to use X-On/X-Off handshaking, the Monitor displays a warning. Similarly, if
“X-On/X-Off” or “None” is selected and DSR is set off by the external device,
a warning will appear.
Hardwire Mode
This parameter determines how the Monitor uses the control lines of the
interface. Three set-ups exist:
•
3–Wire mode
•
Switched–Line mode
•
Leased–Line mode
In 3–wire mode, only the data lines are used. All control lines are ignored.
This means that X-On/X-Off handshake is the only handshake method
available.
In Switched–Line mode, the CTS and DSR control lines are monitored. If one
of the two control lines is set off, data transmission from the Monitor is
blocked. It is recommended that the external device uses the DSR line for
handshaking.
In Leased–Line mode, the CTS, DSR and DCD control lines are monitored.
CTS and DSR have the same effect as in Switched-Line mode. If the DCD
input control line goes off, the Monitor ignores all incoming data.
1.4.3 Transmission Interrupt
If the Monitor receives a Ctrl-C (ASCII 3) character over the interface during
transmission of data, the transmission will be aborted.
