IAI America PCON-CF - Manual (Page 162)

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8. Parameter Settings
z Silent interval multiplier (No.45 SIVM)
This parameter is not used for this controller. It is applied to controllers of RS485 serial communication type.
If specified, this parameter defines the multiplier to be applied to the silent interval time for delimiter judgment in
the RTU mode.
The default setting is the communication time corresponding to 3.5 characters in accordance with the Modbus
specification.
This setting need not be changed for normal operations performed with a PC or teaching pendant.
If the scan time of the PLC is not optimal and the character transmission interval exceeds the silent interval, the
silent interval time can be extended using parameter No. 45.
The minimum setting unit is “1 [time],” while the input range is “0 to 10.” If “0” is set, no multiplier is applied.