2-1
when the master meter cycles the power on the modem its RS485 port would stop
working – in this configuration the RS485 port receives power from the following meter
in the chain, useful in some situations (eg access to RS485 bus from the optical port of
the master meter).
The options with modem power out are configured such that an externally applied
voltage on the power pin (<24VDC) will not damage the meter. Note that the MK10A
provides power on pin 1 rather than pin 5 for RS485 options, which is different to many
of the other EDMI meters – this allows better integration of the multiple ports.
The connection on the label is indicated using a range of symbols that explain what the
connections are. For instance:
TB1
2
2
3
3
2
2
S
S
R
R
LAUD
corresponds with a Mk10A Type 7 port. There is only one RJ45 (TB1), it is a dual
connector (2 serial ports on the one connector), power is supplied ( ), and both ports
are RS232 (the top port is the Modem port, the bottom is the SCADA port).
Table 2-10 and Table 2-11 show the Mk10A connections for TB1 for each
configuration type, and Table 2-12 shows the connections for TB9 where fitted. The
symbols are explained in Table 2-13. A ‘2’ suffix indicates a SCADA port, no suffix
indicates a modem port.
Port Type
Right Hand RJ45 1 2 5 7 9 G,T U,V
TB1-1 +V +V +V +V +V
TB1-2
TB1-3 DTR TX2+ DTR Tx2+
TB1-4 GND GND GND GND GND GND GND
TB1-5 RX RX RX RX RX
TB1-6 TX TX2- TX TX TX TX2- TX
TB1-7 RX2- RX2 RX2- Tx2-/Rx2- (B)
TB1-8 RX2+ TX2 RX2+ Tx2+/Rx2+(A)
• Table 2-10 Mk10A TB1 connections
Port Type
Terminal
Bock
S W
TB1-1 Tx2+/Rx2+(A) Tx2+/Rx2+(A)
TB1-2 Tx2-/Rx2- (B) Tx2-/Rx2- (B)
TB1-3 GND GND
• Table 2-11 Mk10A TB1 Terminal block connections
2-18 EDMI Atlas Hardware Reference Manual
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