IGA 320/23-LO Operating Manual Controls and Connections
14
out
5 grey
Switches on and off LED targeting light
(via push button) (bridge to +24 V)
orange
Screen only for cable extension,
don’t connect at the switchboard
3.2 Connecting the pyrometer to a PC
The pyrometer is equipped with an RS485 serial interface. With the RS485, long transmission
distances can be realized and the transmission is, to a large extent, free of problems. The RS485
also allows several pyrometers to be connected in a bus system.
If an RS485 connection is not available at the PC, it can be accomplished using the RS485 to USB
connector. When using a RS485 to USB adapter, make sure that the adapter is fast enough to
receive the pyrometer’s answer to an instruction of the master. Most of the commonly used
adapters are too slow for fast measuring equipment, so it is recommended to use 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) which delays the response of a command to the
pyrometer (see also 3.2.2
, Wait time t
w
).
3.2.1 Connecting to RS485 interface / baudrate
The pyrometer is operating in half-duplex mode. A1 and A2 as well as B1 and B2 are bridged in
the 8-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 38400 Bd may be set
(via software InfraWin or
the command “br” when
using another communication
software, see command table
under 7
, data format UPP).
The baud rate is reduced by
50% when the transmission distance is doubled. The typical cable length for 19200 Bd is 2 km.
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