Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM User Manual
Page 96
Publication AG-UM008C-EN-P - February 2005
3-28 Configuring MicroLogix 1100/1200/1500 Controllers
Table 3.7 Define these communication parameters when configuring a MicroLogix 1100/1200/1500
controller for DF1 Radio Modem communication.
Parameter
Default
Selections
Baud Rate
19,200
Select a communication rate that all devices in your system support.
Configure all devices in the system for the same communication rate.
Parity
None
Parity provides additional message packet error detection. To
implement even parity checking, choose Even. To implement no parity
checking, choose None.
Node Address
1
A node address identifies the processor on the DF1 half-duplex link.
Each station on a link must have a unique node address. Choose an
address between 0
10
and 254
10.
Node address 255
10
is the broadcast
address, which you cannot select as a station’s individual address.
Store and Forward
File Number
0
Select an unused file (9 to 255) to be the 256-bit Store and Forward
table. Zero disables Store and Forward. Refer to Configuring the
Store and Forward table for more information.
Control Line
No Handshaking
This parameter defines the mode in which the driver operates.
Choose a method appropriate for your system’s configuration:
•
If you are not using a modem, choose NO HANDSHAKING.
•
Half-Duplex Modem (RTS/CTS Handshaking)
(1)
•
Half-Duplex Modem with DCD Handshaking
See page 3-8 for descriptions of the control line operation settings
Error Detection
CRC
With this selection, you choose the how the processor checks the
accuracy of each DF1 packet transmission.
BCC: This algorithm provides a medium level of data security. It
cannot detect:
•
transposition of bytes during transmission of a packet
•
the insertion or deletion of data values of zero within a packet
CRC: This algorithm provides a higher level of data security.
Select an error detection method that all devices in your
configuration can use.
When possible, choose CRC.
RTS Off Delay
0
Defines the amount of time, in 20 millisecond increments, that
elapses between the end of the message transmission and the
de-assertion of the RTS signal. This time delay is a buffer to make
sure that the modem has transmitted the message, but should
normally be left at zero. See page 3-11 for further guidelines for
setting this parameter.