LumaSense Technologies IGA 5-LO - Handbuch (Seite 9)

IMPAC pyrometers IS 5 · IS 5-LO · IGA 5 · IGA 5-LO
9
(fixed socket: model ERA.0S.302.CLL,
straight plug: model FFE.0S.302.CLAC50
Fa. Lemosa GmbH, http://www.lemo.de)
Pin 1 Video-Output: BAS-Signal (white) → Cinch: middle pin SCART: Pin 20
2 1
Pin 2 Video- Output: Ground (brown) → Cinch: shield SCART: Pin 17
Note: The video output is not isolated from the power supply, therefore if several units are
switched together using a video multiplexer, then each unit must have its own iso-
lated power supply.
3.2
Connecting the pyrometer to a PC
The pyrometer is equipped with a serial interface RS232 or RS485. Standard on a PC is the RS232 inter-
face. 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 Ù RS232 take care, that the converter is fast enough to receive the pyrome-
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 (order no. 3 852 430).
3.3
Connection via interface RS232
The transmission rate (in baud) of the serial interface is
dependent on the length of the cable. Values between
1200 and 38400 Bd may be set.
The baud rate has to be reduced by 50% when the
transmission distance is doubled (see also 8.4 Baud
rate
).
Typical cable length for RS232 at 19200 Bd is 7 m.
The software InfraWin contains a function to test the
reliability of the transmission with the selected baud
rate (see under 9.7, Basic settings Æ Test)).
PC
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
3.4
Connection via interface RS485
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 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
38400 Bd may be set.
The standard cable length for 19200 Bd is
2 km. The baud rate is reduced by 50%
when the transmission distance is doubled
(see 8.4 Baud rate). 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
DGN
D
B1 A2 B2 A1
DGN
D
B1 A2 B2 A1
DG
N
D
A2 B2 A1 B1
Master
Pyrometer 32
e.g. address 31
Pyrometer 2
e.g. address 01
Pyrometer 1
e.g. address 00