LumaSense Technologies IGA 320/23 - Handbuch (Seite 7)

IMPAC pyrometer IGA 320/23
7
3.1 Pin assignment of the male socket on the back of the pyrometer
Pin Color Indication
1 white + 24 V power supply
2 brown 0 V power supply
3 green + I
outp. analog output
4 yellow – I
outp.
analog output
5 grey
Switches on and off LED targeting light
(via push button) (bridge to +24 V)
6 blue switch contact (reference point 0 V)
7 violet A1
8 black B1
7 red/blue A2 (bridge to A1)
8 gray/pink B2 (bridge to B1)
orange
Screen only for cable extension,
don’t connect at the switchboard
3.2
Connecting the pyrometer to a PC
The pyrometers are equipped with a serial RS485 interface for connecting to a PC. With RS485 the trans-
mission is to a large extend free of problems, long transmission distances can be realized and several py-
rometers 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 or USB for a standard connection to a PC.
When using a converter RS485  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 RS485  RS232 converter
-7520 (ref. no. 3 852
430) or the RS485  USB converter “USB nano“ (ref. no. 3 852 600).
With a slow RS485 connection it is also possible to set a wait time to the pyrometer (e.g. via the “Test” field
of the software InfraWin, see 7.7) which delay the response of a command to the pyrometer (see also 3.3,
Wait time tw).
3.2.1
Connecting to RS485 interface / baudrate
The pyrometer is operation in 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 inter-
face in Baud (Bd) is dependent on the
length of the cable. Values between 1200
and 38400 Bd may be set (via 7, soft-
ware InfraWin or the command “br”
when using an own communication soft-
ware, see command table under 11, data
format UPP
® ). The baud rate is reduced by 50% when the transmission distance is doubled. Typical cable
length for 19200 Bd is 2 km.
3.3
Wait time tw
Using a pyrometer with RS485 it is possible that the connection is not fast enough to receive the pyrometer’s
answer to an instruction of the master. In this case a wait time (between 00 and 99 bit) can be set to slow
down the data transfer (e.g.: tw = 02 at a baud rate 9600 means a wait time of
2 /
9600
sec).
Pin assignment
(side of male
inserts)
2
3
4
5
1
7
6
8
Male socket
2
3
4
5
1
7
6
8
2
3
4
5
1
7
6
8
2
3
4
5
1
7
6
8
A
B
B1 A2 B2 A1 B1 A2 B2 A1 A2 B2 A1 B1
Master
Pyrometer 1
e.g. address 00
Pyrometer 2
e.g. address 01
Pyrometer 32
e.g. address 31
Terminator
120 Ohm
S
GRND GRND GRND