Communication Settings For Modbus Protocol - GE MiCOM P40 Agile Technical Manual

P44x/EN ST/Hb6
(ST) 4-50
3.7.3

Communication settings for Modbus protocol

Menu Text
COMMUNICATIONS
RP1 Protocol
Indicates the communications protocol that will be used on the rear communications port.
RP1 Address
This cell sets the unique address for the relay such that only one relay is accessed by
master station software.
RP1 Inactiv Timer
This cell controls how long the relay will wait without receiving any messages on the rear
port before it reverts to its default state, including resetting any password access that was
enabled.
Baud Rate
This cell controls the communication speed between relay and master station. It is important
that both relay and master station are set at the same speed setting.
Parity
This cell controls the parity format used in the data frames. It is important that both relay
and master station are set with the same parity setting.
Physical Link
This cell defines whether an electrical connection ("Copper") or fiber optic connection is
being used for communication between the master station and relay. The optional fiber optic
communications board will be required if 'Fiber optic' is to be selected.
Date/Time Format
This cell allows the user to set the "Modbus IEC Time and Date format" at the user interface
nd
and front/2
When 'Disabled' is selected, the "Standard IEC" time format complies with IEC 60870-5-4
requirements such that byte 1 of the information is transmitted first, followed by bytes 2
through 7.
When 'Enabled' is selected, the transmission of information is reversed (Reverse IEC time
format).
RP1 Status
This cell indicates the status of the rear communication board.
RP1 Port Config.
This cell defines whether an electrical KBus or EIA(RS)485 is being used for communication
between the master station and relay.
RP1 Comms. Mode
The choice is either IEC60870 FT1.2 for normal operation with 11-bit modems, or 10-bit no
parity.
RP1 Baud Rate
This cell controls the communication speed between relay and master station. It is important
that both relay and master station are set at the same speed setting.
Default Setting
Modbus
255
15 mins.
19200 bits/s
None
RS485
Disabled
port besides the Modbus 1
Data
KBus
IEC60870 FT1.2
19200 bits/s
Setting Range
Min.
7
1 mins.
9600 bits/s, 19200 bits/s or 38400 bits/s
Odd, Even or None
RS485, Fibre optic
Disabled, Enabled
st
rear port.
KBus or EIA(RS)485
IEC60870 FT1.2 or 10-Bit No Parity
9600 bits/s, 19200 bits/s or 38400 bits/s
Setting
MiCOM P40 Agile P442, P444
Step Size
Max.
34 1
30 mins. 1 min.