Specifications

Communication Choices 9
1785-SO036C-EN-P - April 2002
Serial Network The PLC-5 serial port is configurable for RS-232, RS-423, or
RS-422A-compatible serial communication. Use the serial port to
connect devices that:
• communicate using the DF1 protocol, such as modems,
communication modules, programming workstations, or other
serial devices.
• send and receive ASCII characters, such as ASCII terminals,
bar-code readers, and printers.
When configured for system mode, the serial port supports the DF1
protocol. Use system mode to communicate with others devices on
the serial link. You can select a DF1 mode:
Features:
• communicate using DF1 protocol
• RS-232, -423, -422A configurable
• supports SCADA applications
Communication Choices
Use this DF1 mode: For:
point to point communication between a PLC-5 controller and other DF1-compatible devices.
In point-to-point mode, the PLC-5 controller uses DF1 full-duplex protocol.
DF1 master control of polling and message transmission between the master and each
remote node.
In master mode, the PLC-5 controller uses DF1 half-duplex polled protocol.
DF1 slave using the controller as a slave station in a master/slave serial network.
In slave mode, the PLC-5 controller uses DF1 half-duplex protocol.