MKS MF1 - Page 81

Chapter 5: Process Interfaces
81
Define the stop bits.
0 => 1,5 Stop Bits
1 => 1 Stop Bit
2 => 2 Stop Bits
Failsafe Timeout
This configures the timeout between characters at ASCII mode, at RTU mode this parameter is not
used.The timeout value is defined in milliseconds. If the value is > 0 the timeout function is active.
If the time for the next command is bigger then the timeout time a Timeout Error occurred.
If a Timeout Error occurred, the operation LED switch to red and the valve is shutdown.
To activate the valve controller you have to set the Valve Override to Normal status and send a
setpoint.
To clear the red timeout LED you have to read the Communication Status.
At delivery the timeout function is deactivated by a value of 0.
A new timeout value is stored in the non-volatile memory of the device.
Baudrate
Supported Baud Rate
Expected Baud
Rate
Actual Baud
Rate
CD
(Clock Divider)
Error
[%]
Comment
50 50 60069 0
110 110 27304 0
300 300,01 10011 0
600 599,97 5006 -0,01
1200 1199,93 2503 -0,01
2400 2400,82 1251 0,03
4800 4797,81 626 -0,05
9600 9595,62 313 -0,05
14400 14370,47 209 -0,21
19200 19252,75 156 0,27
28800 28879,12 104 0,27
38400 38505,49 78 0,27
56000 55619,05 54 -0,68
57600 57758,24 52 0,27
115200 115516,48 26 0,27
It is possible to use other baud rates, but it is not recommended to work with an error higher than
5%. The MODBUS specification advises an error smaller then 1%.
16
48054857
∗
≈
BaudRate
CD
For the calculation of the error use this formula: