DA70131-1/3E
III-14
1-3. Line transceiver and pulse transformer for the center device
To make connections for serial communication, use RS-485 line transceivers (driver/receiver) and pulse
transformers (1000
μH or equivalent).
Connect the line transceivers as shown below:
On a transmission line, connect terminating resistors suitable for the cable impedance (100 ohms or similar).
The position of the terminating resistor can be either before or after the pulse transformer. The same effect will be
obtained at either position.
Serial line 1 and serial line 2 are identical, except for their serial signal input terminals on the center device (SIA and
SIB).
In order not to load the lines too heavily, two identical line inputs are provided.
If there are only a few local devices and the serial line is relatively short, a single one of the input lines named
above will be enough to maintain a reliable signal.
If you will not be using one or the other of the two inputs (SIA or SIB), connect the unused terminal (SIA or SIB) to
GND.
Note 1: When connecting the serial lines to line transceivers, make the path as short and straight as possible.
Running these lines on a PC board could deteriorate the communication performance.
Note 2: Pull down resistors to GND, should be 5 to 10 k-ohms.
SIA
SO
SOEH
SIB
_____
SOEL
DI
DE
RO
Y
Z
A
B
Terminating
resistor
Serial line 2
Pulse transformer
1000
μ
H
or
equivalent
(Note 2)
DI
DE
RO
Y
Z
A
B
Line transceiver
(5 V)
Terminating
resistor
Serial line 1
Pulse transformer
1000
μ
H
or
equivalent
Center device
Note 1: When connecting the serial lines to line
transceivers, make the path as short
and straight as possible.
Line transceiver
(5 V)
GND
Содержание Motionnet G9001A
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