700 P electronics module
Interfaces
4.
43
4.2
RS485 interface
The RS485 interface is used for data transfer to superordinate
guide systems such as Process Monitoring system or other sys-
tems that support the Wallace & Tiernan RS485 protocol. For more
detailed information, please refer to the instruction manual “RS485
interface”. These can be requested from your affiliate or download
from our website.
The RS485 interface is electrically isolated. To integrate into a
Wallace & Tiernan bus system, four terminal strips, a terminating
resistor R
t
and balancing resistors R
u
and R
d
are integrated.
If the Pool Management system is integrated in an RS485 bus sys-
tem, then, at the time of installation, the device must be connected
to the end of the bus via the terminals 31/32 (1 ).
When installed in the middle of the RS485 bus, the terminal 31/32
must be used for the incoming bus cable and terminal 33/34 (2 )
for the outgoing bus cable.
Image 2 Section of board
A
Dip switch to activate balancing resistors R
u
and R
d
B
DIP switch for activating the bus terminating resistor R
t
Please note
When installation is at the end of the bus, the DIP switch R
t
must
be activated (position ON).
When installation is in the middle of the RS485 bus, R
t
must be set
to OFF.
A shielded, twisted 2-wire cable (twisted pair) with a wire cross-
section of at least 0.25 mm² (24 AWG) must be used as the
transfer medium. The characteristic impedance of the cable must
be between 100 ohms and 130 ohms, the cable capacity if
possible < 60 pF/m. The shielding improves the electromagnetic
compatibility (EMC). The bus cable is always wired as a bus from
device to device. Any stub cable to the bus device must not exceed
a length of 0.3 m. We recommend the cable W2T504634 – LiYCY
2 x 0.25 mm².
Please note
Longer junctions in the bus cable are not permitted!
A
B
Содержание WALLACE & TIERNAN 700 P
Страница 1: ...WALLACE TIERNAN ELECTRONICS MODULE 700 P Version 1 31 and later INSTRUCTION MANUAL...
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Страница 145: ...700 P electronics module Declarations and certificates 10 145 10 2 Certificate of Compliance...
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