LAMBRECHT meteo
|
AEM
|
METEO-LCD 14742
aem.eco
LCD-Anzeiger/ LCD indicator
No. 00.14742._010002
page
–
5
5.3
Electrical connection
All electrical connections to DC power supply (24 VDC =
3 poles) and signal input (RS 422 = 8 poles) are carried out
with two separate terminal strips with removable cable plug
connector. Due to a different performance of the connectors
they can not be mixed up. The connectors are part of the
delivery.
For the transmission of digital RS 485 signals double shielded
types of cables with twisted pairs of conductors are highly rec-
ommended in order to fulfil the EMC/EMI requirements. When
terminating the cables it is recommended to use braided,
flexible cables and corresponding cable sleeves.
To the „RS 485 IN/OUT“ connector the prepared conductors
can be fitted to the spring contacts of the connectors. They can
be released by pressing down the orange push-button inside
the green plastic socket with a small screw driver. The power
supply cables have to fitted to the connector „IN 24 VDC“ with
regular screw terminals. Both sockets have to fixed with the
two screws each in order to secure a safe operation.
As mentioned in the standards of the National Marine Elec-
tronics Association (NMEA 0183) it is recommended to con-
nect the inner shields of the signal cables to the signal ground
potential on the source (talker) side only.
The common outer shield shall be connected to the back shell
(chassis ground) at both ends.
A third connector on the back side designated with „RS 232c“
(9-pole sub-D-connector) is for configuration and service
purposes in the factory only. The functions and signals of the
connectors are described in the tables below.
Wire cross section of all pins:
0.14...1.5 mm²
Figure: Electrical connection of the indicator
6
Setting to work of the indicator
After having carried out all mechanical and electrical instal-
lation works the system now is ready for the setting to work.
Nevertheless in order to prevent damages caused by wrong
terminations the whole cabling has to be checked once again
before switching on the power by means of an external circuit
breaker.
Once switched on the power the system automatically starts to
operate as configured before in the factory. When the system
is running apart from occasional visual checks no scheduled
maintenance is required.
RS 232 (9-pole SUB-D connector)
PIN No. Signal
Remarks
1
DCD
External jumper to DTR (4) and
DSR (6)
2
RxD
Receive Data
3
TxD
Transmit Data
4
DTR
External jumper to DCD (1) and
DSR (6)
5
GND
Signal Ground
6
DSR
External jumper to DCD (1) and
DTR (4)
7
RTS
Request to send
8
CTS
Clear to send
9
RI
NC
IN / OUT RS 485 (8-pole connector)
PIN No. Designation Remarks
1
A IN
RS 485 A-Terminal
2
B IN
RS 485 B-Terminal
3
circuit
ground
inner shield
4
A OUT
RS 485 A-Terminal
for further indicator
5
B OUT
RS 485 B-Terminal
for further indicator
6
circuit
ground
inner shield
of one wire pair
7
contact
external brightness setting
(push button)
8
contact
external brightness setting
(push button)
IN 24 VDC (3-pole connector)
PIN No. Designation Remarks
+
9...36 VDC
external DC power supply
–
9...36 VDC
external DC power supply
┴
GND
Ground
