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Chapter 3 Communication
Introduction
The RIO has one RS-232 port and one Ethernet port. The RIO is capable of 100bT or a 10bT Ethernet
connection. The RIO-47142 and RIO-47300 have dual port Ethernet switches.
RS232 Port
The RIO board has a single RS232 connection for sending and receiving commands from a PC or other
terminal. The pin-outs for the RS232 connection can be found in the Appendix - Power: J5, 2-pin
Molex.
RS-232 Configuration
Configure the PC for 8 data bits, no parity, one stop bit, and hardware handshaking as shown in Table
2.2. The baud rate for the RS232 communication defaults to 115k baud but can be set to 19.2k baud
by placing a jumper on J5. The serial port has a 4 bytes FIFO.
Handshaking Modes
The RS232 port is configured for hardware handshaking. In this mode, the RTS and CTS lines are
used. The CTS line will go high whenever the RIO is not ready to receive additional characters. The
RTS line will inhibit the RIO board from sending additional characters.
Note:
The RTS line goes high for inhibit. This handshake procedure is required and ensures proper
communication especially at higher baud rates.
Ethernet Configuration
Communication Protocols
The Ethernet is a local area network through which information is transferred in units known as
packets. Communication protocols are necessary to dictate how these packets are sent and received.
Chapter 3 Communication ▫ 18 RIO-47xxx Rev. 1.0r