LumaSense technologies IGAR 12-LO User Manual

ISR 12-LO • IGAR 12-LO Operating Manual Controls and Connections • 17
3.3 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
(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 response of a command to the pyrometer (see 3.4.3 Wait time).
3.3.1 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 must be reduced by
50% when the transmission
distance is doubled (see also
4.14 Baud rate).
Typical cable length for RS232 at
19200 Bd is 7 m.
PC’s side
(soldering side)
K
A
B
C
D
J
G
F
E
H
M
L
1
2
3
4
5
6
7
8
9
DGND (red)
RxD (black)
TxD (violet)
Pyrometer’s side
(soldering side)
3.3.2 Connecting to RS485 interface / baudrate
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
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 dependent on the length of the
cable. Values between 1200 and
115 kBd may be set.
The baud rate is reduced by 50% when
the transmission distance is doubled (see
4.14 Baud rate). Typical cable length
for 19200 Bd is 2 km.
Terminator 120 Ohm
A
B
S
K
A
B
C
D
J
G
F
E
H
M
L
K
A
B
C
D
J
G
F
E
H
M
L
K
A
B
C
D
J
G
F
E
H
M
L
DGND
B1
A2
B2
A1
DGND
B1
A2
B2
A1
DGND
A2
B2
A1
B1
Master
Pyrometer 32
e.g. address 31
Pyrometer 2
e.g. address 01
Pyrometer 1
e.g. address 00

LumaSense technologies IGAR 12-LO Specifications

General

Brand	LumaSense technologies
Model	IGAR 12-LO
Category	Measuring Instruments
Language	English