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IMPAC pyrometers IN 140/5 · IN 140/5-H · IN 140/5-L
4.2
Connecting the pyrometer to a PC
The pyrometers are equipped with a serial interface RS232 or RS485 (switchable at the pyrometer). Stan-
dard 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 real-
ized 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
ter'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 Ι-7520 (order no. 3 852 430).
With a slow RS485 connection it is also possible to set a wait time at the pyrometer which delay the re-
sponse of a command to the pyrometer (see 9.9 Wait time tw).
4.2.1
Connecting to RS232 interface
The transmission rate (in baud) of the serial inter-
face is dependent on the length of the cable. Val-
ues between 2400 and 115200 Bd may be set.
The baud rate has to be reduced by 50% when
the transmission distance is doubled (see also 9.7
Baud rate)
Typical cable length for RS232 at 19200 Bd is
7 m.
4.2.2
Connecting to RS485 interface
Half-duplex mode:
A1 and A2 as well as B1 and B2 are
bridged in the 12-pin round connector of
the connecting cable, to prevent reflec-
tions due to long stubs. It also safe-
guards against the interruption of the
RS485 bus system should a connecting
plug be pulled out. The master labels
mark the connections on the RS485
converter. The transmission rate of the
serial interface in Baud (Bd) is depend-
ent on the length of the cable. Values
between 2400 and 115200 Bd may be
set.
The baud rate is reduced by 50% when
the transmission distance is doubled
(see 9.7 Baud rate). Typical cable length for 19200 Bd is 2 km.
4.3
Connection of additional analyzing devices
Additional
analyzing
instruments, for exam-
ple a LED digital dis-
play
instrument
only
needs to be connected
to a power supply and
the analog outputs from
the pyrometer.
Another Instruments like a controller or printer can be
connected to the display in series as shown above (total
load of resistance max. 500 Ohm).
RS232 take care, that the converter is fast enough to receive the pyrome-
C
Pyrometer's side
(soldering side female
cable connector)
Master
A
B
S
E
F
D
C
L
B
A
Pyrometer 1
e.g. address 00
TxD (violet)
RxD (black)
DGND (red)
cable
E
F
G
M
D
H
L
J
B
A
K
G
E
F
G
M
D
M
H
C
J
L
K
B
A
K
Pyrometer 2
e.g. address 01
white
24 V DC
brown
green
yellow
1 2 3 4 5
6 7 8 9
PC's side
(soldering side female
cable connector)
Terminator
120 Ohm
E
F
G
D
M
H
H
C
J
L
J
B
A
K
Pyrometer 32
e.g. address 31
230V ~
Power supply
°C
LED digital display
Controller
Writer
9
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