Connections in Detail
6-13
RS-485
The RS-485 port on the meter has the factory option of either an RJ45, or a 5 way
terminal block. Table 6-4 lists the connections. Pin 1 of the RJ45 is on the right hand
side). Pin 1 of the terminal block is on the left hand side.
RJ45
Terminal
Block
Description Full
Name
TB10-1
TX2
Transmit Data-SCADA port
TB10-2
RX2
Receive Data-SCADA port
TB10-3
1
TX+ (A)
Tr
TB10-4 5 GND
Ground
TB10-5* +5
+5V,140mA
output
TB10-6
2
TX- (B)
Transmit Data
TB10-7
4
RX- (B)
Receive -
TB10-8
3
RX+ (A)
R
•
Table 6-4 RS-485 connections
*TB10-5 is connected to a +14V power source from the meter.
To operate the meter in two wire mode, simply wire TX- to RX- and TX+ to RX+.
These may be wired together as a factory fitted option.
Note that the 5-pin terminal block has a different pinout to the EDMI mk6 and mk3
meter RS485 ports.
See Figure 6-4 and Figure 6-5 for the location of the connector. The 5 way terminal
block is fitted in the same place (instead of) the RJ45 shown.
RX2 and TX2 are only present if the port is a dual RS485/RS232 port, and in this case
RX2 and TX2 are RS232 signals.
One fitment option is two RJ45’s wired in parallel (TB9 and TB10) – useful for wiring a
series of meters together using premade cables.
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 a smart read head 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.
The Mk10E Meter 6-13
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