Ceiec Electric PMC-1220E User manual

PMC-1220E
Industrial RS485 Hub
User Manual
Version: V1.0A
01/10/2013
Ceiec Electric Technology

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This manual may not be reproduced in whole or in part by any means without the express
written permission from Ceiec Electric Technology (CET).
The information contained in this manual is believed to be accurate at the time of
publication; however, CET assumes no responsibility for any errors which may appear here
and reserves the right to make changes without notice. Please consult CET or your local
representative for the latest product specifications.

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Limited warranty
Ceiec Electric Technology (CET) offers the customer a minimum of
12-month functional warranty on the device for faulty parts or
workmanship from the date of dispatch from the distributor. This
warranty is on a return to factory for repair basis.
CET does not accept liability for any damage caused by device
malfunctions. CET accepts no responsibility for the suitability of the
device to the application for which it was purchased.
Failure to install, set up or operate the device according to the
instructions herein will void the warranty.
The unit should only be opened in a fully anti-static environment.
Failure to do so may damage the electronic components and will void the
warranty.

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Table of Contents
Chapter 1 Introduction...................................................................................................................... 5
1.1 Overview ....................................................................................................................................5
1.2 Features......................................................................................................................................5
1.3 Typical Applications ................................................................................................................ 5
1.4 Getting more information.....................................................................................................5
Chapter 2 Installation ........................................................................................................................6
2.1 Appearance ............................................................................................................................... 6
2.2 Unit Dimensions....................................................................................................................... 6
2.3 Mounting ................................................................................................................................... 6
2.4 Power Supply Wiring..............................................................................................................8
2.5 Chassis Ground Wiring........................................................................................................... 8
Chapter 3 Application........................................................................................................................ 9
3.1 LED Indicators ........................................................................................................................... 9
3.2 Typical Application .................................................................................................................. 9
Chapter 4 Communication Settings............................................................................................. 10
4.1 Baud Rate Settings (J1 and J2) ........................................................................................... 10
4.2 Communication Format Settings (J3) ..............................................................................11
4.3 Termination Resistor Settings (J4 to J8) .......................................................................... 11
Appendix A Technical Specifications ........................................................................................... 11
Appendix B Standards of Compliance......................................................................................... 13
Appendix C Ordering Guide ........................................................................................................... 14
Contact us ........................................................................................................................................... 14

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Chapter 1 Introduction
This manual explains how to use the PMC-1220E RS485 hub. This chapter provides an overview of
the PMC-1220E and summarizes many of its key features.
1.1 Overview
The PMC-1220E is an Industrial RS485 hub with one upstream port and four downstream ports. Not
only can the PMC-1220E be used to increase the number of RS458 nodes beyond the 32 limit, it can
also be used to simplify the wiring for a RS-485 network by splitting a long segment into four
individual shorter segments, thus reducing labor and material costs while expanding the coverage area.
Each RS485 port is optically isolated to protect the connected devices from electrical surges as a result
of lightning or other electrical faults.
1.2 Features
One upstream RS485 port and four downstream RS485 ports
15kV ESD protection
3kV isolation protection on all RS485 signals
Dip-switch selectable baud rates from 1,200 to 38,400bps
< 1µs transmission delay between upstream and downstream ports
Built-in termination resistor for each port
Short circuit protection on the RS485 bus
Metal enclosure
DIN-Rail and Wall Mounting
Extended operating temperature
1.3 Typical Applications
Energy Management System, Building, Factory and Substation Automation
Simplify RS485 wiring and support segmentation
Increase the number of RS485 nodes from the standard 31 nodes to a maximum of 4x31 nodes
Contact CET Technical Support should you require further assistance with your application.
1.4 Getting more information
Additional information is available from CET via the following sources:
Visit www.ceiec-electric.com
Contact your local representative
Contact CET directly via email or telephone

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Chapter 2 Installation
2.1 Appearance
Figure 2-1 Appearance
2.2 Unit Dimensions
Figure 2-2 Dimensions
2.3 Mounting
The PMC-1220E should be installed in a dry environment with no dust and kept away from heat,
radiation and electrical noise source. Installation steps:
Wall Mounting

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Pre-drill the mounting holes based on the mounting diagrams below
Mount the device by affixing the supplied screws to the wall through the circular part of the key
holes on the mounting flange and then sliding the device downwards into position
Figure 2-3-1 Wall Mounting
DIN-Rail Mounting
Before installation, make sure that the 35mm DIN-Rail is already in place
Align the top of the mounting clip at the back of the PMC-1220E at an angle against the top of the
DIN rail as shown in the figure below
Rotate the bottom of the PMC-1220E towards the back while applying a slight downward pressure
at the top to make sure that the device is completely and securely fixed on to the DIN rail

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Figure 2-3-2 DIN-Rail Mounting
2.4 Power Supply Wiring
The PMC-1220E comes standard with a 95-250VAC/DC universal power supply.
For AC supply, connect the live wire to the L/+ terminal and the neutral wire to the N/- terminal.
For DC supply, connect the positive wire to the L/+ terminal and the negative wire to the N/- terminal.
Figure 2-4 Power Supply Connections
2.5 Chassis Ground Wiring
The following figure illustrates the Chassis Ground connection.
Figure 2-5 Chassis Ground Connection

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Chapter 3 Application
3.1 LED Indicators
PMC-1220E’s front panel is equipped with six LED indicators –P0, P1, P2, P3, P4 and PWR. When
power is applied, the PWR indicator will lit up. When the serial ports (P0, P1, P2, P3 and P4) are
connected and have activities, the Px (P0, P1, P2, P3, P4) indicator will blink.
LED
Color
Function
PWR
Red
Supply power indicator
P0
Green
Upstream RS485 activities on Port 0
P1
Green
Downstream RS485 activities on Port 1
P2
Green
Downstream RS485 activities on Port 2
P3
Green
Downstream RS485 activities on Port 3
P4
Green
Downstream RS485 activities on Port 4
Table 3-1 LED Indicators
3.2 Typical Application
The following figure illustrates the typical application of the PMC-1220E:
Figure 3-1 Typical Application

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Chapter 4 Communication Settings
The communication settings for the PMC-1220E are controlled by Jumpers on its PCB. To configure
the PMC-1220E, the metal enclosure must first be removed to reveal the Jumpers' locations.
Jumpers J1 to J8 are located on the PMC-1220E’s PCB as illustrated in Figure 4-1 below.
Figure 4-1 Jumper Locations
Jumper
Description
J1
Baud Rate Settings for downstream RS485 ports P1 to P4
J2
Baud Rate Settings for upstream RS485 port P0
J3
Communication Format Settings
J4
Termination Resistor Settings for P1
J5
Termination Resistor Settings for P2
J6
Termination Resistor Settings for P3
J7
Termination Resistor Settings for P4
J8
Termination Resistor Settings for P0
Table 4-1 Jumper Descriptions
4.1 Baud Rate Settings (J1 and J2)
The baud rate settings are described in Table 4-2.The default settings is 9600 for all RS485 ports.
J1 and J2 (Baud Rate Settings)
Baud Rate
pin1
pin2
pin3
pin4
pin5
1200
Not Installed
Not Installed
Not Installed
Not Installed
Not Installed