346 Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
Appendix G Connect to Networks using DF1
Configure a Slave Station To choose the controller as a slave station, follow the steps below using your programming
software:
Define these parameters when configuring a Micro800 controller as a slave station.
1. To bring up the configuration page, click
Serial Port.
2. On the Serial Port configuration page, select
Half-Duplex Slave for your DF1 Mode.
3. Configure the rest of the communication
driver according to Table 96
.
Table 96 - Configure a Micro800 Controller as a Slave Station
Parameter Selections
Baud Rate
Select a communication rate that all devices in your system support. Configure all
devices in the system for the same communication rate.
Parity
Parity provides additional message packet error detection. To implement even parity
checking, choose Even. To implement no parity checking, choose None.
Node Address
A node address identifies the controller 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.
Control Line
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 HANDSHAKE.
• If the master modem is full duplex and the slave modem is half-duplex, choose
HALF-DUPLEX WITHOUT CONTINUOUS CARRIER (RTS/CTS).
See page Modem Control Line Operation
on page 338 for descriptions of the control
line operation settings.
Error Detection
With this selection, you choose how the controller 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.
Duplicate Packet Detect
Duplicate Detect lets the controller detect if it has received a message that is a
duplicate of its most recent message from the master station. If you choose
duplicate detect, the controller will acknowledge (ACK) the message but will not act
on it since it has already performed the message’s task when it received the
command from the first message.
If you want to detect duplicate packets and discard them, check this parameter. If
you want to accept duplicate packets and execute them, leave this parameter
unchecked.
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