ABB REF 54 Series Technical Reference Manual page 62

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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.
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SPA address 0...999
Baud rate 4800; 9600; 19200 bps
Rear connection Connect
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.
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Subnet number 1...255
Node number 1...127
Bit rate 78.1; 1250 kbps
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.
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Unit address 1...254
Baud rate 9600, 19200
Function type 0..255
Scale factor 1.2 or 2.4
Frame type 0..17
RTD data frame
0 or 1
1) Refer to Table 12.6.-3
2) 0 = Off; 1 = On
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1
9600
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1
1
1250
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1
9600
160
1.2
1)
0
2) 0
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Slave number for communication
Data transfer rate for communication
1)
Activate rear SPA connection
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LON subnet number
LON node number
LON communication speed
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IEC_103 station address
Communication speed
Unit function type
Analogue value scale factor
Measurement frame type
If RTD data frame is on, then it is
send to every second class 2
data poll. Store and reset is
needed.