Advantech WebAccess Device Driver Guide
Sharp JW 10 Serial
Version 6.0 rev 0
Advantech Corp., Ltd.
page 9
In addition, Indicates the number of times after the first attempt has failed
that communication should be attempted before indicating a failure.
Specifically, how many times to send a single packet after the field device
fails to respond to the first packet. After the retry count is exceeded, all the
tags in the packet are marked with asterisks and the next packet of requests
is sent. A reasonable value is 3 to 5 times. After this number of tries, the
tags
in this packet are marked as "fail to respond" (i.e. asterisks) and are
disabled.
In reality, increasing the number of retries hides failures on the part of the
field device to respond to a request. Essentially, increasing the retries gives
the field device more chances to reply.
3.2.10
Auto Recover Time
The Sharp JW 10 was tested with Auto Recover Time = 60 Seconds.
Auto Recover Time is the time to wait before attempting to re-establish
communications with a BAD device or port.
If communications to the PLC is unusually slow due to hardware,
communications or network issues, you might consider increasing this value.
If communications to the PLC or RTU fails frequently, you may want to
decrease this number in order to have WebAccess try to re-establish
communications sooner.
If communications to the PLC, RTU or device Fails (i.e. exceeds Timeout)
WebAccess will wait the Auto Recover Time before trying to re-establish
communications.
3.2.11
Hand Shake RTS
The Sharp JW 10 was tested
HandShakeRts = Yes
.
The RTS (Request To Send) signal is raised and lowered on the Serial
Communications Port if this value set to Yes.. RTS is determined by settings
in the field device.
Refer to your device interface manual to determine the
value for this field and the type of cable used.
3.2.12
Hand Shake DTR
The Sharp JW 10 was tested with
HandShakeDtr = Yes
.
The DTR (Data Terminal Ready) signal raised and lowered on the Serial
Communications Port if this value is set to Yes. DTR is determined by
settings
in the field device and the type of cable used.
Please refer to the
Manufacturer’s Documentation to determine if DTR handshake is set in the
PLC.
3.2.13
Backup Port
The Backup Port has not been tested for the Sharp JW10.
3.3
Device Properties - SharpJW
Add your device to the Serial Port, by selecting the Serial Port you have
configured, then select
Add Device
. Or, to modify an existing Device, Select
Device Properties
. The Device Properties Page for a Serial Type Device
appears.
