ABB REM 54 Series - LON;SPA Bus Communication on the Rear Connector X3.3; Front Panel Optical RS-232 Connection for a PC; Communication Parameters

1MRS750915-MUM
REM 54_
71
Machine Terminal
Technical Reference Manual, General
5.1.13.3. LON/SPA bus communication on the rear connector X3.3
The 9-pin D-type subminiature female connector (RS-485 connection) on the rear
panel connects the machine terminal to the distribution automation system via the
SPA bus or the LON bus. The fibre-optic interface module type RER 103 is used for
connecting the machine 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 RS-485 interface are set also via
the Communication menu.
5.1.13.4. Front panel optical RS-232 connection for a PC
The optical connector on the front panel isolates the PC galvanically from the
machine terminal. The front connector for the PC is standardized for ABB relay
products and requires a specific opto-cable (ABB art. No 1MKC950001-2). The
cable is connected to the serial RS-232 port of the PC.
The front panel is intended for the connection of a PC when configuring the machine
terminal with the CAP 50_ and SMS 510 tools. The front connector uses the SPA
bus protocol.
5.1.13.5. Communication parameters
The communication parameters for the SPA, Modbus and LON protocols are set in
the Communication menu of the terminal and activated by storing the changes
and resetting the device. These parameters cannot be changed with the Relay Setting
Tool.
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) of the communication parameters and SPA address (slave number).
The SPA communication parameters are the same for all SPA communication via
the optical front connector, the rear RS-485 and RS-232 connectors. The SPA
address is the same also for transparent SPA communication on the LON protocol.
Parameter Value Default value 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
a
a. This functionality is valid only in machine terminal revisions of releases prior to Release 2.0. The
parameter is accessible only via serial communication. SPA communication on the front connector
inhibits the rear X3.3 SPA communication and the transparent SPA communication on the LON
protocol and remains inhibited for one minute after the SPA communication has stopped. It is
possible to release this blocking situation by writing the value 1 to the V202 variable.