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Technical Reference Manual, General
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The communication parameters for the SPA, IEC_103 and LON protocols are set in
the
Communication
menu of the REF 54_ feeder terminal and activated by
storing the changes and resetting the device. These parameters cannot be changed
with the Relay Setting Tool.
The SPA bus protocol uses an asynchronous serial communication protocol (1 start
bit, 7 data bits + even parity, 1 stop bit) with adjustable data transfer rate; Baud rate
(default 9.6 kbps) and SPA address (slave number).
The SPA communication parameters are the same for communication via the front
optical RS-232 and the rear RS-485 connectors. The SPA address is the same also
for transparent SPA communication on the LON.
1) This functionality is valid only in the feeder terminal revisions of releases prior to the Release 2.0.
The parameter is accessible only via serial communication. SPA communication on the front
connector inhibits the rear X3.3 SPA communication and the transparent SPA communication on the
LON protocol and remains inhibited for one minute after the SPA communication has stopped. It is
possible to release this blocking situation by writing the value 1 to the V202 variable.
Adjustable LON serial communication parameters are Subnet number, Node
number and Bit rate.
The bit rate 78.1 kbps on the LON protocol is used for the FTT-10 serial
communication network using the RER 115 module connected to the X3.3
connector. The bit rate 1250 kbps on the LON protocol is used for the optical serial
communication network using the RER 103 module connected to the X3.3
connector.
Adjustable IEC_103 serial communication parameters are shown in the table
below.
1) Refer to Table 12.6.-3
2) 0 = Off; 1 = On
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SPA address
0...999
1
Slave number for communication
Baud rate
4800; 9600; 19200 bps
9600
Data transfer rate for communication
Rear connection
Connect
Activate rear SPA connection
1)
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Subnet number
1...255
1
LON subnet number
Node number
1...127
1
LON node number
Bit rate
78.1; 1250 kbps
1250
LON communication speed
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Unit address
1...254
1
IEC_103 station address
Baud rate
9600, 19200
9600
Communication speed
Function type
0..255
160
Unit function type
Scale factor
1.2 or 2.4
1.2
Analogue value scale factor
Frame type
0..17
1)
0
Measurement frame type
RTD data frame
0 or 1
2)
0
If RTD data frame is on, then it is
send to every second class 2
data poll. Store and reset is
needed.
