SATEC SA300 ezPAC Operation Manual - Manual (Page 14)

Chapter 2 Device Description Communicating with the SA300
14 SA300 Substation Automation Unit
Communicating with the SA300
Communication with the SA300 can be established independently and
simultaneously through any communications port using the support PAS program
supplied with the device, Windows HyperTerminal or any terminal emulation software
available, as well as Telnet, or user application software. All communication ports are
slave ports and have factory-preset parameters, such as baud rate, data format, and
communications protocol that can be easily changed whenever desired.
Serial Communications (COM1-COM3)
The SA300 has three serial communication ports COM1 through COM3 for
communicating with the master workstations, RTUs, PLCs or PCs, and with an
optional remote display. All serial ports can operate in the RS-485 two-wire mode.
The COM1 and COM2 ports can also be used for RS-422 four-wire communication.
The COM1 port has an additional 9-pin DTE RS-232 connector and can be directly
connected to the RS-232 port of a PC or a controller. It is also used as a service port
for local programming and upgrading the device firmware.
All ports are optically isolated and can operate at baud rates up to 115200 bps. Each
port can be set up for any communication protocol supported by the SA300
independently from other ports. All ports are factory preset to 19200 bps, 8-bits/No-
parity data format, and programmed for the Modbus RTU protocol.
The COM3 port has different connection terminals and is intended for communication
with the Remote Display Module (RDM) or Remote Graphical Module (RGM). If the
remote display is not used, the COM3 port can be used as a common RS-485 port.
See Configuring Serial Ports in Chapter 4 for information on how to set up serial ports
in your device. For wiring diagrams, refer to the SA300 Installation Manual.
: Note
The COM3 port terminals 4 and 5 deliver 12VDC for powering the remote display module.
Connecting the RS-485 wires to these terminals can cause permanent damage to your RS-485
port.
Infrared Port (COM4)
The SA300 has an optical infrared (IR) port for local retrieving data via a hand-held
unit or a portable PC. The IR port can be equipped with an IEC- or ANSII-compatible
optical head.
The IR port is identified in the SA300 as the COM4 port. It is factory preset to 19200
bps, 8-bits/No-parity data format, and programmed for the Modbus RTU protocol.
Modem Port (COM5)
The SA300 has an embedded 56K modem for direct connecting to the public
telephone lines. The modem port is identified in the SA300 as the COM5 port. By
default, it operates in answer mode and is factory preset for direct communicating
through the Modbus RTU protocol. If required, the modem port can be programmed
(by replacing the firmware) to operate as a dial-out port for remote notifications.
The modem does not need to be configured, just plug the phone cord into the modem
port and the other end into the wall jack, and the device is ready for communications.
USB Port
A USB node port is intended for local communications with the support PAS software.
It is directly connected to your PC’s USB port using the supplied USB cable. The USB
communications does not require any settings. Just connect your PC to the SA300
USB port and install the supplied USB driver (see Installing the USB Driver in
Chapter 6). The USB communications is ten times faster than the serial
communications can provide at a maximum baud rate.