Connecting To A Df1 Half-Duplex Network - Allen-Bradley MicroLogix 1100 User Manual
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Communication Connections
DF1 Half-Duplex Configuration Parameters
Parameter
Baud Rate
Parity
Node Address
Control Line
Error Detection
EOT Suppression
Duplicate Packet (Message)
Detect
Poll Timeout (x20 ms)
RTS Off Delay (x20 ms)
RTS Send Delay (x20 ms)
Message Retries
Pre Transmit Delay
(x1 ms)
Publication 1763-UM001E-EN-P - June 2015
Connecting to a DF1 Half-Duplex Network
When a communication port is configured for DF1 Half-Duplex Slave,
available parameters include the following:
Options
300, 600, 1200, 2400, 4800, 9600, 19.2 KBps, 38.4 KBps
none, even
0...254 decimal
no handshaking, half duplex modem (RTS/CTS handshaking, no handshaking (485 network)
CRC, BCC
enabled, disabled
When EOT Suppression is enabled, the slave does not respond when polled if no message is queued. This
saves modem transmission power and time when there is no message to transmit.
enabled, disabled
Detects and eliminates duplicate responses to a message. Duplicate packets may be sent under noisy
communication conditions if the sender's Message Retries are not set to 0.
0...65,535 (can be set in 20 ms increments)
Poll Timeout only applies when a slave device initiates a MSG instruction. It is the amount of time that
the slave device waits for a poll from the master device. If the slave device does not receive a poll within
the Poll Timeout, a MSG instruction error is generated, and the ladder program needs to requeue the MSG
instruction. If you are using a MSG instruction, it is recommended that a Poll Timeout value of zero not be
used. Poll Timeout is disabled when set to zero.
0...65,535 (can be set in 20 ms increments)
Specifies the delay time between when the last serial character is sent to the modem and when RTS is
deactivated. Gives the modem extra time to transmit the last character of a packet.
0...65,535 (can be set in 20 ms increments)
Specifies the time delay between setting RTS until checking for the CTS response. For use with modems
that are not ready to respond with CTS immediately upon receipt of RTS.
0...255
Specifies the number of times a slave device attempts to resend a message packet when it does not
receive an ACK from the master device. For use in noisy environments where message packets may
become corrupted in transmission.
0...65,535 (can be set in 1 ms increments)
• When the Control Line is set to no handshaking, this is the delay time before transmission.
Required for 1761-NET-AIC physical Half-Duplex networks. The 1761-NET-AIC needs delay time to
change from transmit to receive mode.
• When the Control Line is set to DF1 Half-Duplex Modem, this is the minimum time delay between
receiving the last character of a packet and the RTS assertion.
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