5-14
RS-485 Passive
The RS-485 port on the meter has the factory option of either an RJ45, or a 4 way
terminal block. Table 5-10 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
TB4-3
TB4-2
TX+ (A)
Tr
TB4-6
TB4-4
TX- (B)
Transmit -
TB4-8
TB4-2
RX+ (A)
R
TB4-7
TB4-4
RX- (B)
Receive -
TB4-4 TB4-3 GND
Ground
TB4-5*
TB4-1*
+8V to +15V Port supply
TB4-1
Not
Connected
TB4-2
Not
Connected
•
Table 5-10 RS-485 connections
*This terminal must be connected to an external power supply in the range of +8V to
+15V, with a capacity to supply 100mA (this is to deal with a shorted bus - normal
operating current is far lower).
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 TB4.
RS-485 Active
The RS-485 port on the meter has the factory option of either an RJ45, or a 2 way
terminal block. Table 5-11 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
TB3-1
TX2
Transmit Data–SCADA port
TB3-2
RX2
Receive Data-SCADA port
TB3-3
TB3-1
TX+ (A)
Tr
TB3-4 GND
Ground
TB3-5* +12
+12V,200mA
output
TB3-6
TB3-2
TX- (B)
Transmit Data
TB3-7
TB3-2
RX- (B)
Receive -
TB3-8
TB3-1
RX+ (A)
R
•
Table 5-11 RS-485 connections
5-14 EDMI Atlas Hardware Reference Manual
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: ......