2-1
RS-485
The RS-485 port on the meter has the factory option of either an RJ45, or a 5 way
terminal block. Table 2-8 lists the connections. Pin 1 of the RJ45 is furthest from the
battery (i.e. on the right hand side). Pin 1 of the terminal block is closest to the battery
(i.e. on the left hand side)
RJ45
Terminal
Block
Description Full Name
TB1-1 Not Connected
TB1-2 Not Connected
TB1-3 1 TX+ (A) Transmit +
TB1-4 5 GND Ground
TB1-5* +5 +5V,140mA output
TB1-6 2 TX- (B) Transmit Data
TB1-7 4 RX- (B) Receive -
TB1-8 3 RX+ (A) Receive +
• Table 2-8 RS-485 connections
*TB1-5 may be connected to a +5V power source from the meter. To do this, fit a
jumper between pins 7 and 8 of PL8. PL8 is a 9 way jumper block located under the
meter lid just behind TB1. Pin 1 is on the right hand side, near the PL8 label. This
supply is not sufficient to supply a GSM modem.
To operate the meter in two wire mode, simply wire TX- to RX- and TX+ to RX+. This
can also be achieved inside the meter. Fit a jumper between pins 1 and 2 of PL8, and
between pins 3 and 4 of PL8. PL8 is a 9 way jumper block located under the meter lid
just behind TB1. Pin 1 is on the right hand side, near the PL8 label.
Note that the 5-pin terminal block has a different pinout to the EDMI mk6 and mk3
meter RS485 ports.
See Figure 2-5 and Figure 2-6 for the location of the connector. The 5 way terminal
block is fitted in the same place (instead of) the RJ45 shown.
PLC
A meter with PLC communications has no TB1 fitted. Communications are made via
the power line, coupled to Phase A and Neutral.
2-16 EDMI Atlas Hardware Reference Manual
To Next Page
Loading...
Need help?
General
