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IMPAC pyrometer IP 140-LO
2) External clearing of the maximum value storage: When the pyrometer is in operating mode, pin J can
be used for external clearing of maximum value storage (see 9.4). To clear the maximum value storage,
connect pin J for a short time to pin K (power supply voltage).
The function "external clearing" is activated with the following conditions:
•
Warm-up is finished (no display "wait")
•
The clear time is set to "extern" (see 9.4 and 10.7).
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 9.4 clear time for the maximum value storage).
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 IMPAC-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 9.10 Wait time tw).
4.2.1
Connecting to RS232 interface
The transmission rate (in baud) of the
serial interface is dependent on the length
of the cable. Values between 2400 and
115200 Bd may be set.
The baud rate has to be reduced by 50%
when the transmission distance is dou-
bled (see also 9.8 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
reflections due to long stubs. It also
safeguards against the interruption of
the RS485 bus system should a con-
necting 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
dependent 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 9.8 Baud rate). Typical cable
length for 19200 Bd is 2 km.
RS232 take care, that the converter is fast enough to receive the pyrome-
D
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
H
L
J
B
A
K
G
E
F
G
M
M
D
H
J
C
L
J
K
B
A
K
Pyrometer 2
e.g. address 01
1 2 3 4 5
6 7 8 9
PC's side
(soldering side female
cable connector)
Terminator
120 Ohm
E
F
G
M
D
H
H
C
L
J
B
A
K
Pyrometer 32
e.g. address 31
9
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