70
1MRS755225
Transformer Terminal
Technical Reference Manual, General
RET 54_
5.1.13.5.
Profibus-DPV1 communication by using SPA-ZC 302 on the rear
connector X3.2
The 9-pin D-type subminiature male connector (RS-232 connection) on the rear
panel connects the transformer terminal to the distribution automation system via the
Profibus protocol. The interface between the transformer terminal and Profibus can
be made through the SPA-ZC 302 Gateway.
In the Profibus mode, the baud rate for relay port X3.2 is set to 38400. The SPA-ZC
302 Gateway should be set to the same baud rate. If the SPA-ZC 302 Gateway is
connected to multiple terminals, the “Protocol 2” parameter should be set to SPA
mode and the SPA baud rate for port X3.2 to 19200.
5.1.13.6.
LON/SPA bus communication on the rear connector X3.3
The 9-pin D-type subminiature connector (RS-485 connection) on the rear panel
connects the transformer terminal to the distribution automation system via the SPA
bus or the LON bus. The fibre-optic interface module type RER 103 is used to
connect the transformer terminal to the fibre-optic communication bus. The module
RER 103 supports both SPA bus and LON bus communication.
The other communication parameters for the rear interface RS-485 are set also via
the Communication menu.
5.1.13.7.
Front panel optical RS-232 connection for a PC
The optical connector on the front panel isolates the PC galvanically from the
transformer terminal. The front connector for the PC is standardized for ABB relay
products and requires a specific opto-cable (ABB art. No 1MKC950001-1). The
cable is connected to the serial RS-232 port of the PC. The other communication
parameters for the rear RS-485 interface are also set in the Communication menu of
the RET 54_ transformer terminal.
The front panel is intended for the connection of a PC for configuring the
transformer terminal with the CAP 50_ tools. The front interface uses the SPA bus
protocol.
5.1.13.8.
Communication parameters
SPA
The SPA bus protocol uses an asynchronous serial communication protocol (1 start
bit, 7 data bits + even parity, 1 stop bit) with adjustable data transfer rate; Baud rate
(default 9.6 kbps) and SPA address (slave number).
The SPA communication parameters are the same for communication via the front
optical RS-232 and the rear RS-485 connectors. The SPA address is the same also
for transparent SPA communication on the LON.
1) This functionality is valid only in the transformer terminal revisions of releases prior to the Release
2.0. The parameter is accessible only via serial communication. SPA communication on the front
Parameter
Value
Default Explanation
SPA address
0...999
1
Slave number for communication
Baud rate
4800; 9600; 19200 bps
9600
Data transfer rate for communication
Rear connection
Connect
Activate rear SPA connection
1)