Ceiec Electric Technology
7
Chapter 1 Introduction
This manual explains how to use the PMC-1304-3 Communications Processor. Throughout the
manual the term “PMC-1304-3” generally refers to all models. Differences between models are
indicated with the appropriate model number.
This chapter provides an overview of the PMC-1304-3 Communications Processor and summarizes
many of its key features.
1.1 Overview
The PMC-1304-3 is the ideal embedded equipment for connecting RS-422 or RS-485 enabled serial
devices to an IP-based LAN, making it possible for SCADA or other applications to access serial devices
over a LAN for monitoring and control applications. The PMC-1304-3 has been specifically designed
with industrial automation in mind and therefore provides un-surpassed performance and reliability
under the harshest industrial environments. The basic Model, PMC-1304-3-T, provides Modbus
Gateway function from Modbus TCP to RTU and supports interrogation from multiple Modbus
Masters. The optional RTU Model, PMC-1304-3-R, provides Modbus Mastering capability with local
data caching and logging to enhance overall system performance and redundancy. Not only does the
RTU Model support the polling of Real-Time data, it also supports the uploading of Data Logs, Event
Logs and Waveform Logs for CET devices that provide these advanced capabilities.
The PMC-1304-3 comes with Tx/Rx LEDs for the serial ports on the front panel. The LEDs not only
indicate the network status but also help to monitor the communications activities of the attached
serial devices.
The PMC-1304-3 can be setup through its user-friendly web console.
1.2 Features
Dual 10/100BaseT (RJ45)
Standard 2Xrs-485, optional 4Xrs-485
Basic Model
Modbus Gateway function for 32 Slave IEDs per RS-485 or a maximum of 128 Slave IEDs per
device
RTU Model
Modbus Mastering, Local Data Caching and logging for 64 Slave IEDs per RS-485 port or 256
Slave IEDs per device for a maximum of 25,600 data points.
2GB On-Board Log Memory, sufficient for storing data @ 60-minute interval for 900 days
Scheduled uploading of Data Log in CSV format to an external FTP Server
The PMC-1304-3 is designed to withstand the harshest industrial environments
15kV (contactless) & 6kV (contact) ESD protection and 3kV isolation protection for all Serial
signals
1.5kV isolation protection for Ethernet ports
Simple port configuration via its built-in web interface
DIN-Rail or Surface Mounting
