ABB REG670 - Settings

18.5.3 Settings
Table 740: SPA Non group settings (basic)
Name
Values (Range) Unit Step Default Description
SlaveAddress 1 - 899 - 1 30 Slave address
BaudRate 300 Bd
1200 Bd
2400 Bd
4800 Bd
9600 Bd
19200 Bd
38400 Bd
-
- 9600 Bd Baudrate on serial line
Table 741: LONSPA Non group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Off
On
- - Off Operation
SlaveAddress 1 - 899 - 1 30 Slave address
18.5.4 Operation principle
The SPA bus uses an asynchronous serial communications protocol (1 start bit, 7 data
bits + even parity, 1 stop bit) with data transfer rate up to 38400 bit/s. For more
information on recommended baud rate for each type of IED, refer to Technical
reference manual. Messages on the bus consist of ASCII characters.
Introduction of SPA protocol
The basic construction of the protocol assumes that the slave has no self-initiated need
to talk to the master but the master is aware of the data contained in the slaves and,
consequently, can request required data. In addition, the master can send data to the
slave. Requesting by the master can be performed either by sequenced polling (for
example, for event information) or only on demand.
The master requests slave information using request messages and sends information
to the slave in write messages. Furthermore, the master can send all slaves in common
a broadcast message containing time or other data. The inactive state of bus transmit
and receive lines is a logical "1".
SPA protocol
The tables below specify the SPA addresses for reading data from and writing data to
an IED with the SPA communication protocol implemented.
The SPA addresses for the mA input service values (MIM3 to MIM16) are found in
table
742.
1MRK502052-UEN B Section 18
Station communication
1021
Technical manual