2.
General
2.1
Function
LECOM-LI werks on the basis of optical transmission by means ot
plastic tibre-optic cables.
The tibre-optic adaptors are equipped with an optical tranamitter
and an optical receiver.
By meaes ot the electrooptic tranaducer (light tranamitter) electrical
signals are changed to optical signals, the optoelectric transducer
changes (light receiver) optical signals te electrical signals.
The fibre-optic adaptor is equipped with two Iamps tortunction
control:
The receivlflg pilot lamp (RxD) flashes when receiving an
optical signal.
The transmitting pilot lamp (TxD) tlashes when
transmitting an optical signal
The tibre-optic adaptor must be directly connected te the RS-232
interface of the digitized Lenze drive controllerorthe master
computer.
Fuflction blocks of the ftbre-optic adaptor
__________________
RS-232
Receiver
Electrical
signal
-
RS-232
Tranamitter
Convert er
and Repeater
Light
tranamitter
-—---*
Opt,cal
signal
Light
rece iver
2.2.
Cammunlcatian protacol
LECOM-LI supports the communication protocol
—
LECOM-A/B.
The protocol LECOM-A/B allows the master computer te use all
parameters of the drive controller. LECOM-A/B transmits all
parameter values in (orm ot acknowledged messages.
The transmission time is 9600 baud which means 20 te 30
parametern are transmitted per second. The transmission ot one
parameter usually takes abeut 30 ms te max. 50 ms.
Lanze
7
