Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 158)

Publication 1785-UM012D-EN-P - July 2005
10-8 Communicating with Devices on a Serial Link
Stop bits Match the number of stop bits to the
device with which you are
communicating Select 1, 1.5, or 2.
Control line Select the mode in which the driver
operates. Select a method appropriate for your system’s configuration:
If you are not using a modem, choose NO HANDSHAKING.
If you are using a full-duplex modem, choose FULL-DUPLEX.
Option Settings
Duplicate detect Whether you want the controller to
detect and ignore duplicate messages Select the desired setting.
ACK timeout The amount of time you want the
controller to wait for an
acknowledgment to its message
transmission Enter a value 0-65535. Limits are defined in 20 ms intervals. For example
to wait 40 ms, type 2. The recommended time elapse is 1 second.
Specify 1 second by typing 50.
MSG appl
timeout The number of seconds within which
the reply message must be received
before the error bit is set on the
message. The timer starts when the
ladder program first initiates the
message and is restarted if/when the
ACK is received Enter one of the following values:
1:30-60 seconds
2:60-90 seconds
3:90-120 seconds
4:120-150 seconds
5:150-180 seconds
6:180-210 seconds
7:210-240 seconds
NAK receive The number of NAKs your controller
can receive in response to a
transmitted message Enter a value 0-255. The recommended setting is 3.
DF1 ENQS The number of enquiries (ENQs) that
you want the controller to send after
an ACK timeout Enter a value 0-255. The recommended setting is 3.
This Field Specifies Configure by Doing the Following