Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 77)

Publication AG-UM008C-EN-P - February 2005
Configuring MicroLogix 1100/1200/1500 Controllers 3-9
DF1 Half Duplex Master
When configuring for DF1 half-duplex master, the following control
line operation takes effect:
No Handshaking 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 On) Selected
RTS is always active (high).
Transmissions require CTS to be active.
Half-Duplex Modem (RTS/CTS Handshaking) 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 MicroLogix 1100/1200/1500 controllers for
DF1 Radio Modem, the following control line operation takes effect:
No Handshaking 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 processor is directly connected to another device that
does not require handshaking signals.
Half-Duplex Modem (RTS/CTS Handshaking) 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.