IS 140 • IGA 140 Manual
Controls and Installation
∂
16
Connector pin J
The connector pin J can be used for 3 different functions:
1) Switch contact:
The pyrometer is equipped with a switch contact for use as a thermo
switch. This function enables the detection of a hot object in the measuring beam of the
pyrometer. The contact is activated only in combination with a clear time settings “auto“ or
clear times
″
0.25 s (see
5.4 clear time for the maximum value storage
). If the
temperature exceeds 2 °C min. or 1% of the span of the temperature range above the
minimum range, the power supply (pin K) is connected to pin „J“.
2) External clearing of the maximum value storage:
If the clear time is set to “extern”
(settings see
5.4
), pin J can be used as input for external clearing of the maximum value
storage. To clear the maximum value storage, connect pin J for a short time to pin K (power
supply voltage).
3) hold function:
when the hold function mode is activated the current temperature reading is
frozen as long as J and pin K are connected (see
5.4 clear time for the maximum value
storage
).
3.1.2 Video Output
The pyrometers IS 140-TV and IGA 140-TV are equipped with
an additional 2 pin connector for video output on the rear
cover. LumaSense offers ready made video connection cables
in different length which have Cinch and SCART plug for
connection to a video monitor.
Using self-made cables: A 2-wire shielded cable must be used,
the shield has to be connected to the housing of the plug on
pyrometer side only. Video ground and pyrometer housing
are galvanically separated. The maximum cable length should
not exceed 40 m.
Video output
(fixed socket:
model ERA.0S.302.CLL,
straight cable plug:
model FFE.0S.302.CLAC50
Fa. Lemosa GmbH, http://www.lemo.de)
Pin 1 Video output: CVBS (white)
↑
Cinch: middle pin
SCART: pin 20
Pin 2 Video output: ground (brown)
↑
Cinch: shield
SCART: pin 17
3.1.3 Connecting the pyrometer to a PC
The pyrometers are equipped with a serial interface RS232 or RS485 (switchable at the
pyrometer). Standard on a PC is the RS232 interface. At this interface one pyrometer can be
connected if the interface is set to RS232. Only short distances can be transmitted with RS232
and electromagnetic interferences can affect the transmission.
With RS485 the transmission is to a large extend free of problems, long transmission distances
can be realized and several pyrometers can be connected in a bus system. If RS485 is not
available at the PC, it can be realized with an external converter which converts the RS485 in
RS232 for a standard connection to a PC.
When using a converter RS485
∫
RS232 take care, that the converter is fast enough to receive
the pyrometer’s answer to an instruction of the master. Most of the commonly used converters
are too slow for fast measuring equipment. So it is recommended to use the LumaSense
converter
Η
-7520 (order no. 3 852 430).
With a slow RS485 connection it is also possible to set a wait time at the pyrometer, which
delays the response of a command to the pyrometer (see
5.10 Wait time t
w
).
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