328 Rockwell Automation Publication 2080-UM002M-EN-E - April 2022
Appendix G Connect to Networks using DF1
Modem Control Line
Operation
The following explains the operation of the Micro800 controllers when you
configure the RS-232 serial port for the following applications.
DF1 Full-Duplex
When configured for DF1 full-duplex, the following control line operation
takes effect:
No Handshake Selected
RTS is always inactive (low). Receptions and transmissions take place
regardless of the state of CTS input. Only make this selection when the
Micro800 controllers are directly connected to another device that does not
require handshaking signals.
Full-Duplex (RTS always ON) Selected
RTS is always active (high).
Transmissions require CTS to be active.
DF1 Half-Duplex Slave
When configured for DF1 half-duplex slave, 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.
Half-Duplex without Continuous Carrier (RTS/CTS) Selected
RTS is only activated during transmissions (and any programmed delays
before or after transmissions). Transmissions require CTS to be active.
Micro850 (2080-L50E) and Micro870 (2080-L70E) controllers support RTS/CTS
modem handshaking when configured for DF1 Full-Duplex protocol with the control
line parameter set to Full-Duplex Modem Handshaking or DF1 Half-Duplex slave
protocol with the control line parameter set to Half-Duplex Modem.
These controllers also support DCD (Data Carrier Detect) line for DF1 Radio Modem
protocol. No other modem handshaking lines (such as Data-Set™ Ready and Data
Terminal Ready) are supported by Micro800 controllers.
To Next Page
Loading...
Need help?
General
