Ethernet Communication; Legacy Protocols - GE P741 Technical Manual

SCADA Communications
MiCOM P741, P742, P743
The next cell down controls the inactivity timer.
The inactivity timer controls how long the relay will wait without receiving any messages on
the rear port before it reverts to its default state, including revoking any password access
that was enabled. For the rear port this can be set between 1 and 30 minutes.
In the case of EIA(RS)232 and EIA(RS)485 the next cell down controls the baud rate. For
K-Bus the baud rate is fixed at 64kbit/second between the relay and the KITZ interface at the
end of the relay spur.
Courier communications is asynchronous. Three baud rates are supported by the relay,
'9600 bits/s', '19200 bits/s' and '38400 bits/s'.
If the second rear port is not used, this can also be provided with a KITZ201.
P741
Add 6
P743
Add 7
P742
Add 8,
Per PU connection: I (A,B,C) + Inputs + Outputs + Events + Disturbance
The KITZ201 can be used to communicate with upto 32 relays but it is prefarable to use 1 kitz201 per KITZ274 to not slow down the communication
Note:
1.4

Ethernet communication

1.4.1

Legacy protocols

It is possible to communicate through an Ethernet network using a I4XS4UE (refer to
P4x4/EN REB user guide for Redundant Ethernet board connexions).
RP2 inactivity timer
15 mins.
RP2 baud rate
19200
Idiff (A,B,C) + Ibias (A,B,C) + Inputs + Outputs + Events + Disturbance
Kbus/courier Port 3
FIGURE 5: SECOND REAR PORT EIA(RS)232 EXAMPLE
The KITZ201 redates the events
CU & PU
Port 2 RS 232
Port 1 Kbus/courier
Kitz201
Add 2
Kbus/courier Port 3 Port 1 or
Port 2
Kitz274
Add 1
P74x/EN SC/Na7
(SC) 13-11
Local PC
IEC 103 / Fibre
Vdew/IEC Master
IEC 103 / RS 485/RS
P3797ENb
SC