Siemens 7SG11 Manual page 124

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
Setting name
Comms Protocol
Comms Baud Rate
Comms Parity
Relay Address
Line Idle
Data Echo
Laptop computer
Figure 4.3-1
©2013 Siemens Protection Devices Limited
Range (bold = default)
IEC 60870-5-103, MODBUS-RTU (Modbus-RTU
not available in Argus 4 & Argus 6)
75, 110, 150, 300, 600, 1200, 2400, 4800, 9600,
19200
NONE, EVEN
0, 1...254
LIGHT ON, LIGHT OFF
OFF, ON
Sigma 4
(SG4-103)
Communication to Argus Relay using Sigma 4 (Local Connection)
7SG11 Argus Technical Reference
Units Notes
baud
Tx
Rx
P300007 Communications.vsd / Sigma 4 remote
P20007 Page 69 of 71
Rx
Tx