19 PACSystems™ RSTi-EP EPSCPE115 Standalone CPU Quick Start Guide GFK-3039C
Modbus RTU Configuration
The CPE115 may be configured as a Modbus RTU Slave device using either or both
serial ports (RS-232 or RS-485): (Refer to Figure 5). The Serial Port Setup COMMREQ
function can be used to activate a Modbus RTU protocol over a serial port.
To configure the Serial Port COMMREQ Data Block on CPE115, refer to section 6.1.6
of the PACSystems RX3i and RSTi-EP CPU Reference Manual, GFK-2222.
Serial I/O Configuration
The CPE115 may be configured to use Serial I/O protocol using either or both serial
ports (RS-232 or RS-485): (Refer to Figure 5). The Serial Port Setup COMMREQ
function can be used to activate a Modbus RTU protocol over a serial port.
To configure the Serial Port COMMREQ Data Block on CPE115, refer to section 6.1.6
of the PACSystems RX3i and RSTi-EP CPU Reference Manual, GFK-2222.
Serial I/O protocol is active only when the CPU is in RUN Mode, since it is driven
completely by COMMREQ functions in the application program. The different
COMMREQ commands that are supported by Serial I/O Protocol are described in
section 6.2.4 of the PACSystems RX3and RSTi-EP CPU Reference Manual, GFK-2222.
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