RS485 Net Monitoring Temperatures
Pressure Transducer Setup (XM679 Only) • 35
20.5.RS485 Net Monitoring
Temperatures
20.5.1.RS485 Connection
Sharing a single pressure transducer across multiple
controllers on a LAN:
The parameter (
Adr
) also defines the number of
configurations on the RS485 network (besides the
LAn
); its value must be only from 1 to the total
number of devices present on the RS485 and the LAN
networks.
Press for three (3) seconds, the
rtC
or
other will be shown. The measurement
unit blinks.
Press more than once the DOWN arrow to
find the
Adr
parameter, then press
SET
.
Set the value of
Adr
parameter, then press
SET
to confirm the parameter.
Press the two keys together to exit from
the menu or wait for about 10 seconds.
20.6.How to Enable a
Pressure Probe to
Share Across the LAN
1. Enter the
Pr1
How to Enter the Parameters List PR1
2. Select
Pr2
parameter and press the
SET
key.
3. The
PAS
flashing message will display, followed
shortly by “
0 --
” with a flashing zero.
4. Use the
UP
or
DOWN
button to input the security
code in the flashing digit. Confirm the security code
by pressing
SET
. The security code is
321
.
5. If the security code is correct, the access to Pr2 is
enabled by pressing
SET
on the last digit.
6. Navigate to the
LPP
of the Master device (the
device where the pressure probe is connected) and
select
(Y)
. Set the
LPP
to
(N)
for all other slave
devices.
7. Navigate to
tPP
of the Master device and set it to
PP
(Pressure Probe). The slave devices
tPP
parameter will be set to
LAn
.
8. Navigate to
P5C
parameter (Pressure Probe will
always be assigned to
P5C
) of the Master device
and set it to Pressure Probe type. The slave devices
P5C
parameter will be set to
nP
(No Probe).
1. Terminals -36 and +37
2. Use Belden cable #8761
or #8641.
3. Keep at a maximum
distance of
approximately 1Km.
4. Don’t connect the shield
to the earth or to GND
terminals of the device.
Avoid accidental contact
by using insulating tape.
Figure 20-2 - Sharing a Pressure Transducer Between Devices
on LAN
CAUTION! Do not connect the RS485 cable to
all the instruments that are already connected
on the LAN - only connect the RS485 to the
master device of the LAN.
CAUTION! The same value of the Adr
parameter in different controllers creates
malfunctioning in the monitoring system or
problems on the synchronized defrosts.
Shielded Serial Cable
LAN
LAN
Shielded Serial Cable
NOTE: If pressure is not being shared across
the LAN, each XM679 will need its own
Pressure Transducer. Please reference Figure
18-1 and Figure 19-1 wiring diagrams.
Содержание XM670
Страница 1: ...XM670 XM679 Controllers for Multiplexed Cabinets Installation and Operation Manual 026 1218 Rev 4 ...
Страница 2: ......
Страница 4: ......
Страница 42: ...36 XM679K I O Manual 026 1218 Rev 4 21 Wiring Connection to Site Supervisor Figure 21 1 Site Supervisor Wiring ...
Страница 56: ......
