7SG11 Argus Technical Reference
©2013 Siemens Protection Devices Limited
P20007 Page 69 of 71
4.3.4 Settings
Communication parameters of
Communications Interface:
Comms Baud Rate
,
Communications Interface:
Comms Parity
and
Communications Interface
: Line Idle
should match those of the communicating device.
4.3.5 Comms Protocol
See previous section 4.1.1
4.3.6 Baud Rate
Rates of
19200
,
9600
,
4800
,
2400
,
1200
,
600
,
300
,
150
,
110
and
75
bits per second are provided.
The
Communications Interface:
Comms Baud Rate
setting should match that of the communicating device,
4.3.7 Comms Parity
The
Communications Interface:
Comms Parity
setting allows parity of
Even
or
None
to be selected. This setting should
match that of the communicating device.
4.3.8 Relay Address
Each relay on a network must have a unique address, between
1
and
247
, as set by the
Communications
Interface:
Relay Address
setting. A relay with the default address of
0
will not be able to communicate. The actual
number of devices will be limited to 32 devices on any one RS485 connection.
4.3.9 Line Idle
If the communication medium is fibre-optic the
Communications Interface
: Line Idle
setting defines the quiescent state.
When set as
Light On
binary ’0’ is represented by light on, binary ‘1’ is represented by light off and vice versa for
Light Off
mode. While in
Light On
mode and the device is not communicating it maintains the
Light On
mode to allow
breaks in the cable to be detected. These potential breaks would not be detected when the device mode is set to
Light Off
.
This must be set to
OFF
when connected to the RS485 electrical connection.
4.3.10 Data Echo
All relays must have the
Communications Interface:
Data Echo
setting to
OFF
.
Table 4-2
Communications Settings
Sub-menu:
Communications Interface
Laptop computer
P300007 Communications.vsd / Sigma 4 remote
R
S
2
3
2
Sigma 4
(SG4-103)
Tx
Rx
Tx
Rx
Figure 4.3-1
Communication to Argus Relay using Sigma 4 (Local Connection)
Setting name
Range (
bold
= default)
Units
Notes
Comms Protocol
IEC 60870-5-103
, MODBUS-RTU (Modbus-RTU
not available in Argus 4 & Argus 6)
Comms Baud Rate
75, 110, 150, 300, 600, 1200, 2400, 4800, 9600,
19200
baud
Comms Parity
NONE,
EVEN
Relay Address
0
, 1…254
Line Idle
LIGHT ON,
LIGHT OFF
Data Echo
OFF
, ON