Precision Digital Corporation Helios PD2-6363, Инструкция по эксплуатации

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Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
21
RS-485 Converter Connections
Figure 24 below details the wiring connections from
the RS-485 connector to an RS-485 serial converter
(such as the PDA7485-I or PDA8485-I) for a five-wire
network.
RS-485 Connector to RS-485
Serial Converter Connections
RS-485 Connector RS-485 to USB or
RS-232 Converter
DO DI
DO DI
DI DO
DI DO
Figure 24. Connections for RS-485 Connector to
Serial Converter
Three-Wire Connection
In order to wire the five pins for use as a three-wire
half-duplex RS-485 connection, it is necessary to
create a jumper connection between DI to DO and /DI
to /DO- as shown below.
Figure 25. Three-Wire RS-485 Connection
Digital I/O Connections
Digital inputs and outputs are provided in order to
expand the functionality of the meter. Digital input
connections are made via a push button or switch to
the appropriate digital input terminal and the +5 VDC
terminal. Digital output connections are made by
wiring from the appropriate digital output terminal to
the ground terminal.
Figure 26. Digital Input and Output Connections
F4 Digital Input Connections
A digital input, F4, is standard on the meter. This
digital input connected with a normally open closure
across F4 and COM, or with an active low signal
applied to F4. It can be used for remote operation of
front-panel buttons, to acknowledge/reset relays,
reset totals, or to reset max/min values. See
Function
Keys & Digital I/O Available Settings on page 53 for a
complete list of capabilities.
Figure 27. F4 Digital Input Connections
4-20 mA Output Connections
Connections for the 4-20 mA transmitter output are
made to the connector terminals labeled MA OUT.
The 4-20 mA output may be powered internally or
from an external power supply.
Figure 28. 4-20 mA Output Connections
__ __
DI DI DO DO
O1 O2 O3 O4 G
I 1 I 2 I 3 I 4 +5
Ground
5 VDC
4-20 mA Input
Remote Display, PLC,
Chart Recorder, Etc.
-
+
R I- I+
1 3 2
RELAY1
mA OUT
24 V
12-35 VDC
Power
Supply
+
4-20 mA
Input Meter
- +
R I- I+
1 3 2
RELAY1
3 2 1
-
24 V
mA OUT
Internal Power Supply
and Analog Output
3 2 1
Active Output Loop Passive Output Loop