LumaSense Technologies IN 520 - Manual (Page 17)

Series IN 500 Operating Manual Controls and Connections 17
Fig. 4 : There are two holes with 4 mm screws for
mounting the converter housing.
After mounting, connecting cables and
parametrizing (if necessary), close the cover of the
converter and tighten the 4 screws.
Note: If using the pyrometer with measuring output thermocouple type K or J, this
output has to be connected with the correct compensating cable.
3.4 Connecting to serial interface
The pyrometers are equipped with a
serial interface RS232 or RS485
(switchable at the pyrometer). Only
short distances can be transmitted
with RS232 and electromagnetic
interferences can affect the
transmission. With RS485. The
transmission is, to a large extent, free
of problems. Long transmission
distances can be realized and several
pyrometers can be connected in a bus
system.
The transmission rate (in baud) of the
serial interface is dependent on the
length of the cable. Values between
1200 and 19200 Bd may be set.
Typical cable length for RS232 at
19200 Bd is 7 m.
Typical cable length for RS485 at
19200 Bd is 2 km.
Connection example of 2 instruments with RS485:
A2
B2
TxD/A1
GND
RxD/B1
0 V
+24 V
A2
B2
TxD/A1
GND
RxD/B1
0 V
+24 V
A
B
120
24 V DC
24 V DC
RS232
RS485
RS232
RS485
M
a
st
e
r
Pyrometer 1, e.g. address 00
Pyrometer 2, e.g. address 01
mounting of
converter
Fig. 4