Rockwell Automation Publication 2080-UM002M-EN-E - April 2022 329
Appendix G Connect to Networks using DF1
DF1 Half Duplex Master
When configuring for DF1 half-duplex master, the following control line
operation takes effect:
No Handshake Selected
RTS is always inactive. Receptions and transmissions take place regardless of
the state of CTS input. Only make this selection when the controller is directly
connected to another device that does not require handshaking signals.
Full-Duplex Modem (RTS always ON) Selected
RTS is always active (high).
Transmissions require CTS to be active.
Half-Duplex without Continuous Carrier (RTS/CTS) Selected
RTS is only active during transmissions (and any programmed delays before
and after transmissions).
Transmissions require CTS to be active
DF1 Radio Modem
When you configure the Micro800 controllers for DF1 Radio Modem, the
following control line operation takes effect:
No Handshake Selected
RTS is always inactive. Receptions and transmissions take place regardless of
the state of CTS input. This selection should only be made when the controller
is directly connected to another device that does not require handshaking
signals.
Half-Duplex without Continuous Carrier (RTS/CTS) Selected
RTS is activated during transmission and during any programmed delays
before or after transmissions. Programmed delays include RTS Send Delay
and RTS Off Delay.
Transmissions require CTS to be active. If CTS is inactive at the onset of
transmission, one second will be provided to wait for CTS to become active
before the message packet is discarded.
Half-Duplex with DCD Handshake Selected
RTS is activated during transmissions and during any programmed delays
before and after transmissions. Programmed delays include RTS Send Delay
and RTS Off Delay. The DCD input signal is monitored to determine if
transmissions are acceptable. If DCD is active, receptions are possible.
Transmissions require CTS to be active and DCD to be inactive. If DCD is
active at the onset of transmission, a configured delay (DCD Wait Delay) will
wait for DCD to become inactive before discarding the packet. If CTS is
inactive at the onset of transmission, one second will be provided to wait for
CTS to become active before the message packet is discarded.
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