Amplicon 485HF9, Инструкция по эксплуатации

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Model 485HF9
Page 11
FIGURE 2.5 POWER CONNECTIONS FOR MULTIPLE MODEL 485 ADAPTORS
2.4.1 Connecting the Amplicon Mains Adaptor
The optional mains adaptor plugs directly into a 3 pin, 13 A mains socket (U.K. version), or
must be fitted with a suitable plug (International version). The mains supply voltage must be
230 VAC ±10%, 50 Hz. The DC output is by a two wire cable approximately 2 m in length. This
cable is terminated in a moulded connector which must be cut off and discarded. The two wires
can then be parted and stripped back about 6 mm. The black wire is negative and goes to
terminal 7 (GND) of the 485HF9 Adaptor, and the black wire with a white stripe is positive and
goes to terminal 8 (VDC). Section 5.3 gives the Amplicon order codes for the above adaptors.
2.5 Full Duplex / Half Duplex Operation
The Model 485HF9 Adaptor can be used in either full duplex (simultaneous transmission and
reception over two independent wire pairs) or half duplex (sequential transmission or reception
over a single wire pair).
In full duplex operation, a separate transmitter and receiver circuit is employed, and in this
mode the transmitter can be left in its enabled state at all times. In half duplex operation, the
transmitter must be disabled by switching to its high impedance state to allow reception of data
over the same serial lines.
The Model 485HF9 Adaptor is provided with all the data input/output terminals required for full
duplex operation.
If half duplex working is required, then the following external and
internal configuration changes must be considered. Also check that the termination
resistor, paragraph 3.3.4, is correctly set for the system in use.
POWER SUPPLY
5.0 to 13.0 VDC
–
+
Model
485HF9
Adaptor
Ground line (–) is connected
internally to RS-232 Ground
Model
485HF9
Adaptor
EN 1
GND 2
TX 3
TX 4
RX 5
RX 6
GND 7
VDC 8
EN 1
GND 2
TX 3
TX 4
RX 5
RX 6
GND 7
VDC 8