3.8.1 Communication link settings
Table 10: Communication link settings
Setting Description
Operation This enables the IEC 60870-5-104 protocol instance to
work on the Ethernet link. This setting should be set to
"On".
Client IP The IP address of the IEC 60870-5-104 client for which this
instance is intended. Only a TCP connection request from
this client IP address is accepted for this instance. If the IP
address is set to 0.0.0.0, any client is accepted. In such a
case, it is possible to distinguish between different clients
through different TCP connection port socket configura-
tions for each instance.
TCP Port TCP connection port socket used by this instance. The
combination of the
Client IP
and
TCP Port
settings defines
to which IEC 60870-5-104 client the instance is given.
Device address Device address of this IEC 60870-5-104 instance. The de-
fault setting of
Link address length
parameter is "1" octet,
which enables only Device address values 1...255.
ASDU address Standard “Common address of ASDU”. In most cases, this
value should be the same as
Device address
. If it is set to
another value, it may also have to be configured on the
client side. The default setting of
ASDU address length
parameter is "1" octet, which enables only
ASDU address
values 1...255.
Link mode Defines if the communication link is balanced or unbal-
anced. The default setting, balanced, is mostly used by IEC
60870-5-104 links. However, the unbalanced mode can also
be used even though this link mode is more common for
serial IEC 60870-5-101 links.
COT length Length (number of octets used) of the Cause Of Transmis-
sion field. The default value is "2". The additional informa-
tion included in the
COT length
= 2 alternative is however
not supported by this IEC 60870-5-104 implementation.
IOA length Information Object Address field length (number of oc-
tets used) definition. This means the object addresses
of IEC 60870-5-104 data points. The default setting is "2"
octets. In Communication Management of PCM600, 16-bit
addresses are supported. Consequently, if this setting is
changed to "1", it must be ensured that no point addresses
higher than 255 are defined.
Link address length Length (number of octets used) of the Link address field.
The default setting is "1" octet. The length must match the
configuration throughout the network. This field is filled
with the
Device address
value.
ASDU address length
Length (number of objects used) of the “Common address
of ASDU” field. The default setting is "1". This must be
Table continues on the next page
Vendor-specific implementation 2NGA001859 A
26 REX615
IEC 60870-5-104 Communication Protocol Manual
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