Chapter 3 Communication
Introduction
The RIO has one RS-232 port and one Ethernet port. The RS-232 port is the data set, and it is a standard
serial link with a communication baud rate up to 115kbaud. The Ethernet port is jumper configurable for 10
or 100Base-T (default).
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 - J5 Power: 2 pin Molex.
RS-232 Configuration
Configure the PC for 8 data bits, no parity, one stop bit, and hardware handshaking. 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. The RIO
supports two industry standard protocols, TCP/IP and UDP/IP. The board will automatically respond in the
format in which it is contacted.
10 Chapter 3 Communication
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