Lumasense-technologies IS 50-LO plus Manuel d'utilisateur télécharger pdf (Page 14)

IS 50-LO plus / IGA 50-LO plus Manual Controls and Installation  14

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 5.3 Clear time for the maximum value

storage).

3.1.2 Connecting the pyrometer to a PC

The pyrometers are equipped with a serial interface RS232 or RS485 (switchable at the

pyrometer). Only one pyrometer can be connected on the standard PC RS232 interface. Only

short distances can be transmitted with RS232 and electromagnetic interferences can affect the

transmission.

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 an RS485 or RS232

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 at the pyrometer which delay

the response of a command to the pyrometer (see 5.9 Wait time tw).

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 doubled

(see also 5.7 kBaud (baud rate)).

Typical cable length for RS232 at 19200 Bd is

7 m.

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 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 2400 and

115200 Bd may be set.

The baud rate is reduced by 50% when the transmission distance is doubled (see 5.7 Baud Rate

(kBaud)). Typical cable length for 19200 Bd is 2 km.

DGND (red)

RxD

(black)

TxD (violet)

Pyrometer’s side

(soldering side)

cable

PC’s side

(soldering side)

Terminator 120 Ohm

DGND

Master

Pyrometer 32

e.g. address 31

Pyrometer 2

e.g. address 01

Pyrometer 1

e.g. address 00

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 35 36

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Lumasense-technologies IS 50-LO plus Manuel d'utilisateur Page 14

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