LumaSense Technologies IS 12-Al/S - Manual (Page 14)

IS 12 AI & IS 12-AI/S Controls and Installation 14
For additional limit contacts cable
The instrument is equipped with two independent relay limit switches. These are two separate
switch-over relay contacts, changing its state if the adjusted temperatures are exceeded.
Pin Color Indication
6
8
4 5
3 1
2
7
Pin assignment
of right connector
(side of male
inserts)
7 pink
Limit contact S1
(drawing shows status without
power or with exceeded limits)
5 white
1 yellow
3 grey
Limit contact S2
(drawing shows status without
power or with exceeded limits)
6 green
4 brown
2 blue
8 red
The drawing of the limit contacts indicates their switch status without power. The limit contacts
switch after supplying the pyrometer with power. If the temperature exceeds the adjusted limit
value, the corresponding limit contact switches back in the first position and is indicated by the
corresponding LED on the pyrometer (see 5.6 under Limit contacts).
Any temperature value within the range of the pyrometer is adjustable. The setting of the limits
can be done directly at the pyrometer (see 5.6 under Limit contacts). or via PC and software
InfraWin.The switch time of the relay contacts is 2 ms plus the response time of the pyrometer.
To avoid oscillating of the switch in the switch point, the contacts are switching with a hysteresis
(works setting ±2 °C, adjustable between ±2 and ±20 °C). If required the hysteresis can be set via
the InfraWin software, directly at the instrument a setting is not possible.
3.1.2 Connecting the pyrometer to a PC
The pyrometers are equipped with a serial interface RS232 or RS485 (switchable at the
pyrometer). Only one pyrometer can be connected on the standard PC RS232 interface. Only
short distances can be transmitted with RS232 and electromagnetic interferences can affect the
transmission.
The pyrometer is equipped with an RS485 serial interface. With the RS485, long transmission
distances can be realized and the transmission is, to a large extent, free of problems. The RS485
also allows several pyrometers to be connected in a bus system.
If an RS485 connection is not available at the PC, it can be accomplished using an RS485 or RS232
to USB connector. When using a RS485 to USB adapter, make sure that the adapter is fast
enough to receive the pyrometer’s answer to an instruction of the master. Most of the
commonly used adapters are too slow for fast measuring equipment, so it is recommended to
use the RS485
USB converter USB nano (ref. no. 3 852 600).
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 5.12 Wait time tw).