Connections in Detail
5-15
* TB3-5 is connected to a +12V power source from the meter. This voltage is enough
for PSTN, GSM, and GPRS modems.
Transmit refers to transmitting data from the meter. When a terminal block is used the
port operates in 2 wire mode. When an RJ45 is used the port operates in 4 wire mode.
To operate the meter in two wire mode, simply wire TX- to RX- and TX+ to RX+.
See Figure 5-8 and Figure 5-9 for the location of the connector, designated as TB3.
TB3-1 and TB3-2 are present when a 3
rd
serial port option (SCADA port) is fitted to the
meter. They are RS232 signals.
FLAG Port
The meter can have either a Flag Port or an ANSI Port. Use a standard FLAG (IEC1107
physical standard) read head to connect the meter to a PC.
Note that it has occasionally been found that some FLAG heads need to be rotated 180
degrees for them to work. If you have problems try this.
ANSI Port
The meter can have either Flag Port of ANSI Port. Standard Flag and ANSI read heads
should work with the meter. Please note that older EDMI ANSI read heads will not
work with the meter. To use smart read heads that can automatically switch polarity, set
the DTR line to be low – see
Configure
in the
Site Properties
section of the
EziView
Basics
chapter in the Atlas Software Reference Manual.
Inputs
The meter may be fitted with up to 4 inputs, depending on configuration. There are two
main types of inputs available, and a mix of these types may be fitted. Many of the
configurations make use of a common terminal to allow for more I/O in the limited
space available.
Passive inputs require an external voltage to activate them. They are isolated to 4kV
from all other circuits except the other inputs and outputs on the same terminal block.
There are a variety of input voltages that may be ordered with the meter, e.g. 24V,
240V, though higher voltages (>40V) are not available in some combinations and
terminal locations. Under voltage will cause the input to trigger erratically or not at all,
while over voltage will cause excessive heat dissipation and possible damage to the
meter. The rated voltage is the voltage that must be applied between the two terminals
of the input. The inputs work with any polarity, and with AC or DC signals.
Active inputs use a 12V supply from the active RS232 and RS485 versions of the meter
to create active inputs. The power to the input is maintained even if the modem is
power cycled by the meter. A load of 500
Ω
or less across the input terminals will
activate the input. Note that active inputs are not isolated from each other, and are not
isolated from the RS232/RS485 port (they share a ground).
For the locations of the inputs see Figure 5-8 and Figure 5-9.
The Mk7C Meter 5-15
Содержание Atlas Mk10
Страница 48: ...3 16 Intentionally Left Blank 3 16 EDMI Atlas Hardware Reference Manual ...
Страница 64: ...4 16 Intentionally Left Blank 4 16 EDMI Atlas Hardware Reference Manual ...
Страница 111: ......
Страница 112: ......