ABB Switzerland Ltd 1KHW001489-EN ETL600
6.6.3.5. Remote inquiry kit R7AP
The remote inquiry kit R7AP allows to connect RS-232 ports to an RS-
485 station bus, for element management networking as described in
Chapter
4 'User Interface Program'. While ETL600 has its RS-485
bus signals available at the HMI connector on the frontplate of P4LT,
ETL500 requires R7AP for conversion of RS-232 to RS-485 interface
signals. The R7AP base plate can be mounted in a standard 19 inch
frame. If used for ETL500, the plate is mounted directly below the
channel rack P7LC, and the special 9 pole serial cable V9KH –
included in the kit – has to be inserted between ports COM1 of P4LQ
and COM N located on the frontplate of the remote inquiry kit. The
RS-485 bus is formed by connecting all TD(A) wires, all TD(B) wires
and all GND wires at the KRONE connection strip of all R7AP in a
substation together. To minimize reflections, a linear network structure
should be formed instead of a star structure as shown in Fig. 6-22.
ETL600
ETL500
R3
Remote
inq. kit
ETL600
PC with
HMI600
Remote
inq. kit
4
4 4
ETL600
ETL500
R3
Remote
inq. kit
ETL600
PC with
HMI600
Remote
inq. kit
4
4
4
Fig. 6-22 Connections for an RS-485 station bus
6-28 November 2005 Assembly and Installation
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