GHM DeltaOHM HD51.3D Series, Operating Manual

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HD51.3D…
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V2.0
add a signal repeater between a segment and the successive one. Line termination should be
applied at both ends of each segment.
The maximum length of the cable depends on the transmission speed and the cable character-
istics. Typically, the maximum length is 1200
m. The data line should be kept separated from
any power lines in order to prevent interference with the transmitted signal.
Each instrument on the network is univocally identified by an address. Multiple transmitters
with the same address should not be placed on the network.
If the instrument is connected to a data logger, the possibility to connect multiple sensors to
the network depends on the data logger capacity to manage multiple sensors.
Before connecting the instrument to the network, configure address and Baud Rate (see chap-
ter 6).
5.2.3 RS422
SERIAL CONNECTION
15
1
2
3
4
5
6
7
11
12
13
14 16
17
18
19
8
10
9
V+
V -
220Ω 220Ω
Shield Shield
Lmax = 1200m
TX+
RX+
TX-
RX-
GND
V+
V -
RX+
RX-
TX+
TX-
GND
220Ω 220Ω
RS422 standard is used for point-to-point connection on long distances. The instrument is con-
nected to a PC/data logger through a shielded cable with two twisted pairs for signals and an
additional wire for ground. The extremities of the connections should end with line terminators.
The maximum length of the cable depends on the transmission speed and the cable character-
istics. Typically, the maximum length is 1200
m. The data lines should be kept separated from
any power lines in order to prevent interference with the transmitted signal.
Before connecting the instrument to the network, configure address and Baud Rate (see chap-
ter 6).
Power supply
PLC, datalogger or
RS485/USB or RS485/RS232
converter for PC
Termination Termination
Reference of female
connector (solder side)