Serial Communications; Serial Port Communications Capabilities - GE PACSystems RX7i Reference Manual
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- User manual (276 pages) ,
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Chapter 5. Communications
5.2
Serial Communications
RX3i CPUs, except CPE330, support one or more serial ports (see Section 2.2). RX7i CPUs support three
serial ports (see Section 2.3).
The independent on-board serial ports of the CPU are accessed via external connectors on the module.
COM1 and COM2 provide serial interfaces to external devices. COM1 is also used for firmware upgrades.
The third serial port (COM3) on RX7i CPUs is used as the Ethernet Station Manager port.
The RSTi-EP CPE100/CPE115 supports both the RS-232 and RS-485 ports. RS-485 port supports only two
modes of operations 2-Wire and 4-Wire
5.2.1 Serial Port Communications Capabilities
COM1 and COM2 can each be configured for one of the following modes. For details on CPU
configuration, refer to Chapter 3.
▪
RTU Slave – The port can be used for the Modbus RTU slave protocol. This mode also permits
connection to the port by an SNP master, such as the WinLoader utility or the programming
software. For details, refer to Chapter 6, Serial I/O, SNP & RTU Protocols.
▪
Message Mode – The port is available for access by user logic. This enables C language blocks to
perform serial port I/O operations via C Runtime Library functions.
▪
Available – The port is not to be used by the CPU firmware.
▪
SNP Slave – The port can only be used for the SNP slave protocol. For details, refer to Chapter 6, Serial
I/O, SNP & RTU Protocols.
▪
Serial I/O – The port can be used for general-purpose serial communication through use of
COMMREQ functions. For details, refer to Chapter 6, Serial I/O, SNP & RTU Protocols.
RSTi-EP CPE100/CPE115 serial ports support only Modbus RTU Slave only.
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PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual
GFK-2222AD
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