IAI America SCON-C - Manual (Page 212)

194
Appendix
 SIO communication speed
This parameter is used for controllers of serial communication type.
Set the communication speed to be used when the control is performed via serial communication using the
PLC’s communication module.
Set an appropriate value in parameter No. 16 in accordance with the specification of the communication module.
One of 9600, 19200, 38400, 115200 and 230400 bps can be selected as the communication speed.
The factory setting is “38400 [bps].”
 Minimum delay time for slave transmitter activation
This parameter is used for controllers of serial communication type.
This parameter defines the minimum delay until the controller’s transmitter will be activated after completion of
command reception, when serial communication is performed using the PLC’s communication module.
The factory setting is “5 [msec],” but other necessary delay time must be set in parameter No. 17 if the
specification of the communication module exceeds 5 msec.
 Silent interval multiplier
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.