Advantech WebAccess Device Driver Guide
Sharp JW 10 Serial
Version 6.0 rev 0
Advantech Corp., Ltd.
page 8
3.2.4
Data Bits
For the Sharp JW 10, the values are 7 or 8 Data Bits.
The default setting is
7 bits.
This must match the number of data bits configured in the PLC.
Please refer
to the Manufacturer’s Documentation to determine the actual number of Data
Bits set in the PLC.
All PLCs connected to this comport must use the same number of data bits. A
typical value is 8 bits.
3.2.5
Stop Bits
For the Sharp JW 10 there can be 1 or 2 Stop Bits.
The default setting is 1
stop bit.
This must match the number of stop bits configured in the PLC.
Please refer
to the Manufacturer’s Documentation to determine the actual number of Stop
Bits set in the PLC.
All PLCs connected to this comport must use the same number of stop bits.
3.2.6
Parity
For the Sharp JW 10 the Parity can be None, Odd, Even or Disabled.
The default setting is None.
This must match the parity configured in the PLC.
Please refer to the
Manufacturer’s Documentation to determine the actual number of Data Bits
set in the PLC.
All PLCs connected to this comport must use the parity.
3.2.7
Scan Time
The Sharp JW 10 was tested with a Scan time = 2 Seconds.
This is the time in milliseconds to scan the PLC. This must match the ability
of the PLC to respond.
If the PLC cannot respond as fast as the SCAN Time entered, WebAccess will
scan at a slower rate.
3.2.8
Timeout
The Sharp JW 10 was tested with Time Out = 200 Milliseconds.
Timeout is the time waited before re-sending a communications packet that
did not have a reply.
Timeout specifies how long the software waits for a response to a data
request, specifically to wait for a reply from one packet. A recommended
value is 7 to 10 ticks, longer if the communication device is slow. This is
protocol dependent: some protocols do not allow changes in time out.
Combined with Retry count, Timeout also determines time to consider a
device or port as BAD. Timeout is the time to wait since last communication
packet sent without a reply. Time is in milliseconds. The slow or poor quality
communications require longer timeout. The faster the communications
network or device, the shorter the timeout required. Shorter timeouts notify
operators of communications failure more quickly.
3.2.9
Retry Count
The Sharp JW 10 was tested with Retry count = 3.
Number of times to retry communications if no reply is received from a
device. Combined with Timeout, also determines time to consider a device or
port as BAD.
