8.Communication Parameters - ABB REF 54 Series Technical Reference Manual, General

REF 54_
5.1.13.7.
70
Feeder Terminal
Technical Reference Manual, General
Communication parameters
SPA
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.
Parameter Value
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 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.
LON
Adjustable LON serial communication parameters are Subnet number, Node
number and Bit rate.
Parameter
Subnet number 1...255
Node number 1...127
Bit rate 78.1; 1250 kbps
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.
IEC_103
Adjustable IEC_103 serial communication parameters are shown in the table below.
Parameter
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 9.5.-3 on page 124
The IEC_103 protocol is used for the optical serial communication network using
the RER 123 module connected to the X3.2 connector.
The unit address is used for identifying the device from the protocol point of view.
For more information, see Table 5.2.1-11 on page 92.
Default value
1
9600
Value Default
1
1
1250
Value Default
1
9600
160
1.2
1)
0
1) 0
1MRS750527-MUM
Explanation
Slave number for communication
Data transfer rate for communication
1)
Activate rear SPA connection
Explanation
LON subnet number
LON node number
LON communication speed
Explanation
IEC_103 station address
Communication speed
Unit function type
Analog value scale factor
Measurement frame type
If RTD data frame is on, it is sent to
class 2 data poll every second.