IAI America ACON-SE - Manual (Page 98)

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5. Parameter Settings
Ɣ Silent interval magnification (No. 45 SIVM)
This parameter applies to commands via RS485 serial communication.
It defines the magnification of the silent interval time in the delimiter judgment of the RTU mode.
The factory setting is based on the communication time of 3.5 characters in accordance with the Modbus
specification.
This parameter need not be changed under normal operation by the PC or teaching pendant.
When the character transmission interval of the PLC with a strict scan time exceeds the silent interval, parameter
No. 45 allows the extension of the silent interval time.
The minimum setting unit is 1 [times], and the input range is 0 to 10. When the setting in this parameter is 0, it
indicates that this parameter is invalid.