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1MRS750915-MUM
Machine Terminal
Technical Reference Manual, General
REM 54_
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.
The Modbus protocol has two serial transmission modes: ASCII and RTU. These
modes define the bit contents of the message fields transmitted in the network.
Adjustable Modbus serial communication parameters are shown in the table below.
The SPA address and the Subnet/Node number on the LON are used for identifying
the device from the protocol’s point of view and they are independent of each other.
For more information, see Table 5.2.1-11 on page 84.
5.1.13.6. Parallel communication support
When SPA is used, the rear side communication is not stopped when the front
connector is “active”. This enables e.g. uploading of the disturbance records without
affecting the communication to the upper level.
Moreover, if LON is selected as a communication protocol and the front connector
is “active”, transparent SPA write commands are not inhibited via the LON bus.
1
Parameter Value Default value Explanation
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
Parameter Value Default value Explanation
Unit Address 1...247 1 Address of the unit in the Modbus network
CRC Order Low/High; High/Low Low/High The order of CRC bytes in the protocol frame
(not used in ASCII mode)
Modbus Mode ASCII; RTU RTU ASCII or RTU mode
Baud rate 300; 1200; 2400;
4800;9600;19200 bps
9600 Communication speed of the Modbus
protocol
No of stop bits 1...2 1 Number of stop bits
Next char. TO 0...65535 ms 0 Next character time-out
End of frame TO 2...65535 ms 10 End of frame time-out
Parity NONE; ODD; EVEN EVEN Parity setting
No of data bits 5,6,7,8 8 Number of data bits
1. Parallel communication is restricted prior to Release 2.0, refer to section “Release
2.0” on page 98.
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