6.2 Communication protocols
6 Communication
Technical description
176
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VM50.EN004
6.2.4.
SPA-bus
The device has full support for the SPA-bus protocol including
reading and writing the setting values. Also reading of multiple
consecutive status data bits, measurement values or setting
values with one message is supported.
Several simultaneous instances of this protocol, using different
physical ports, are possible, but the events can be read by one
single instance only.
There is a separate document “Spabus parameters.pdf” of SPA-
bus data items available.
Parameters
Parameter Value
Unit Description
Note
Addr
1
899
SPA-bus address. Must
be unique in the system.
Set
bit/s
1200
2400
4800
9600 (default)
19200
bps
Communication speed
Set
Emode
Channel
(Limit60)
(NoLimit)
Event numbering style.
Use this for new
installations.
(The other modes are for
compatibility with old
systems.)
(Set)
Set = An editable parameter (password needed)
6.2.5.
IEC 60870-5-103
The IEC standard 60870-5-103 "
Companion standard for the
informative interface of protection equipment
" provides
standardized communication interface to a primary system
(master system).
The unbalanced transmission mode of the protocol is used, and
the device functions as a secondary station (slave) in the
communication. Data is transferred to the primary system
using "data acquisition by polling"-principle. The IEC
functionality includes the following application functions:
station initialization
general interrogation
clock synchronization and
command transmission.
It is not possible to transfer parameter data or disturbance
recordings via the IEC 103 protocol interface.