ADLINK Technology NuDAM ND-6520 User manual

NuDAM
ND-6520 RS-232 to RS-422/RS-485 Converter
ND-6510 RS-422/RS-485 Repeater
User’s Guide

@Copyright 1999 ADLink Technology Inc.
All Rights Reserved.
Manual Rev. 2.10: June 22, 1999
The information in this document is subject to change without prior notice
in order to improve reliability, design and function and does not represent
a commitment on the part of the manufacturer.
In no event will the manufacturer be liable for direct, indirect, special,
incidental, or consequential damages arising out of the use or inability to
use the product or documentation, even if advised of the possibility of
such damages.
This document contains proprietary information protected by copyright.
All rights are reserved. No part of this manual may be reproduced by any
mechanical, electronic, or other means in any form without prior written
permission of the manufacturer.
Trademarks
Nudam is registered trademarks of ADLink Technology Inc.,
Other product names mentioned herein are used for identification
purposes only and may be trademarks and/or registered trademarks of
their respective companies.

Contents i
Contents
1. INTRODUCTION...........................................................................1-1
1.1 WHAT IS NUDAM ?................................................................1-1
1.2 OUTSTANDING FEATURES OF NUDAM.....................................1-1
1.3 NUDAM-6000 SERIES PRODUCTS OVERVIEW............................1-3
1.4 EIA RS-485 STANDARD..........................................................1-4
1.5 RS-485 ON NUDAM...............................................................1-4
1.6 NUDAM RS-485 NETWORK CONFIGURATIONS........................1-5
1.7 CONSTRUCTING A NUDAM NETWORK.....................................1-7
1.8 TERMINATION BUS..................................................................1-7
1.9. SHIELDING..............................................................................1-8
1.10. HOW TO CALCULATE CHECKSUM VALUE .................................1-9
2. NUDAM-6520..................................................................................2-1
2.1. OVERVIEW..............................................................................2-1
2.2. SETUP.....................................................................................2-6
2.3. INSTALLATION ........................................................................2-8
2.4 PROGRAMMING.......................................................................2-9
3. NUDAM-6510..................................................................................3-1
3.1. OVERVIEW..............................................................................3-1
3.2. SETUP.....................................................................................3-5
3.3 INSTALLATION ........................................................................3-7
3.4 PROGRAMMING.......................................................................3-8
4. INSTALL A BRAND-NEW NUDAM.............................................4-1
4.1 INITIALIZE A BRAND-NEW NUDAM.........................................4-1
4.2 INSTALL A NEW NUDAM TO A EXISTING NETWORK.................4-3
5. SOFTWARE UTILITY...................................................................5-1
5.1 SOFTWARE INSTALLATION.......................................................5-1
5.2 HOW TO EXECUTE THE NUDAM ADMINISTRATION ..................5-1
5.3 NUDAM ADMINISTRATION FUNCTION OVERVIEW....................5-2
6. TROUBLESHOOTING AND MAINTENANCE..........................6-1

Introduction 1-1
1. Introduction
1.1 What is NuDAM ?
NuDAM is a series of data acquisition modules. It provides a total
solution of the data acquisition network and control system. You
can remotely control up to 256 NuDAM modules on RS-485
netowrk. All you need is to use a host computer, like PC (Personal
Computer), with one RS-232 serial port for controlling the whole
system. The maximum communication distance is 4000 feet from
the host computer.
NuDAM is based on the RS-485 multi-drop network system, each
module has an unique address ID. Using simple ASCII command
& response protocol through standard RS-485 interface can
control all the NuDAM modules in the RS-485 network.
The NuDAM modules provide direct linkage to a wide variety of
sensors and perform all signal conditioning, scaling, linearization
and conversion. The modules can be used to measure
temperature, pressure, flow, voltage, current and numerous types
of digital signals.
1.2 Outstanding Features of NuDAM
•Industry standard networking
All NuDAM modules use the RS-485 communication
protocol for transmitting and receiving at high rates and over
long distance.
•Two-wire and multi-drop communication
A single twisted pair of wires is used to transmit and receive
data between modules. Multi-drop capability makes system
configuration more flexible and easy set-up of a network.

1-2 Introduction
•High transfer speed
NuDAM modules provide up to 115.2K bps data / command
transfer rate. It can promote system bandwidth.
•Simple command / response protocol
All communications are performed with printable ASCII
characters. This allows the information to be processed with
string functions common to the most high-level languages.
•Industrial design
The screw terminal plug connectors on every NuDAM
module ensures simple installation and easy modification.
The compact size allows the modules to be mounted on DIN
rail, back-panel wall-mount, etc.
•Watch-dog supervisory
NuDAM contains a watch-dog supervisory circuitry that will
automatically reset the module when the system fails. In
addition, a user-programmable software timer provides a
‘ safe’output signal in the event of host computer failure.
•High isolation voltage
NuDAM provides photo-isolators, which ensure high
isolation voltage, between the data acquisition circuits and
the communication port. The fatal electric-shock won‘ t go
through and damage all the modules on the network.
•Noise immunity
The NuDAM provide extra noise immunity capability. An
electrode, which is coated inside the ABS case, can reduce
electro-magnetic interference (EMI) and noise.
•Harsh environmental protection
A surface coating covers on the PCB and electronic
components of the NuDAM. It allows superior resistance to
harsh environment such as humidity, salt spry and most
harsh chemicals.

Introduction 1-3
1.3 NuDAM-6000 series products overview
The NuDAM-6000 series provides the complete sets of data
acquisition modules, including the communication modules, the
analog input modules, the analog output modules, and the digital
I/O modules.
Communication Module
•NuDAM-6510 : RS-422/RS-485 Repeater
•NuDAM-6520 : RS-232 to RS-422/RS-485 Converter
•NuDAM-6530 : USB to RS-422/RS-485 Converter
Analog Input Modules
•NuDAM-6011 : Multifunction High Gain Analog Input
Module(with DI/O)
•NuDAM-6011D:Multifunction High Gain Analog Input with
5 ½ digit LED Display(with DI/O)
•NuDAM-6012 : Analog Input Module(with DI/O)
•NuDAM-6012D : Analog Input Module with 5 1/2 digit LED
Display(with DI/O)
•NuDAM-6013 : 3-channel RTD Input Module
•NuDAM-6014D : Analog (Transmitter) Input Module with
5 1/2digit LED Display
•NuDAM-6017 : 8-channel Analog Input Module
•NuDAM-6018 : 8-channel Thermocouple Input Module
Analog Output Modules
•NuDAM-6021 : Single Channel Analog Output Module
•NuDAM-6024 : 4-channel Analog Output Module(with DI)
Digital I/O Modules
•NuDAM-6050 : Module with 7 DI channels and 8 DO channels
•NuDAM-6052 : Isolated Digital Input Module
•NuDAM-6053 : 16-channel digital Input Module
•NuDAM-6054 : 15-channel digital Input Module
•NuDAM-6056 : 15-channel digital Output Module
•NuDAM-6058 : 28-channel programable digital I/O Module

1-4 Introduction
•NuDAM-6060 : 4-channel Relay Output & Digital Input Module
•NuDAM-6063 : 8-channel Relay Output Module
•NuDAM-6080 : Counter/Frequency Input Module
1.4 EIA RS-485 Standard
The EIA RS-485 interface is a communication standard
developed for multi-dropped systems that can communicate at
high rate over long distance. The standard RS-485 can operate at
speed up to 10 M bps over cable length up to 4000 feet.
The RS-485 interface can support up to 32 drivers / receivers on
the same line. This allows actual networking applications on a
parity line system (sometimes called multi-drop).
The RS-485 uses differential transmission on a balance line. Its
easy wiring make it popular to use in industrial applications.
1.5 RS-485 on NuDAM
The NuDAM improves the RS-485 capability for minimizing the
user‘ s cost. On each NuDAM module, a half-duplex RS-485
transceiver is used to communicate with other modules. A single
twisted pair of wires, which provides standard differential
transmission, is used to transmit and receive data between
modules. The high input impedance of each NuDAM receiver
allows up to 128 NuDAM modules on the same RS-485 bus
without using a signal repeater.
The maximum transfer rate of NuDAM is 115.2Kbps which is
lower than the maximum speed of the RS-485 standard. The
slew-rate limiter on every RS-485 transceiver of NuDAM is very
useful for transmitting error-free data, minimizing EMI, and
reducing reflections caused by improperly terminated cables.
The NuDAM on a network may not use the same power supply.
Therefore, the voltage difference between ground of the modules
may exist.

Introduction 1-5
Excessive output current and power dissipation caused by faults
or by bus contention are prevented by the current limiter and the
thermal shutdown circuitry inside the NuDAM.
1.6 NuDAM RS-485 Network Configurations
NuDAM-6000 series is designed under RS-485 multi-drop network
architecture. Up to 256 NuDAM modules can be controlled in a
multi-drop network. The limit of 256 is due to command code.
The network can be connected by simple topology (Figure 1-1) or
branch topology (Figure 1-2) or free topology (Figure 1-3).
The ND-6520 and ND-6510 are the two basic communication
modules to construct a RS-485 network. The ND-6520 is a RS-
232 to RS-485/RS-422 converter. The ND-6520 is used to build a
RS-485 port for the host computer by converting standard RS-232
signal into RS-485 signal.
The ND-6510 is the RS-485 signal repeater which is used to
extend or to lengthen the network distance. A NuDAM bus can
connect up to 256 modules, each segment is up to 128 modules.
Whenever the numbers of the modules excess 128, the repeater
should be used. In addition, the length of a standard RS-485 bus
is up to 4000 feet, the repeater should be used whenever the
length of a signal bus is more than 4000 feet.
Figure 1-1 Simple Topology
Host
ND-6520
RS-232/RS-485
Converter
NuDAM Modules
RS-232
RS-485 bus
ND-6520
RS-232 to RS-485/RS-422
Converter
Terminator

1-6 Introduction
Figure 1-2 Branch Topology
Figure 1-3 Free Topology
Host
Host
ND-6520
RS-232 to RS-485/RS-422
Converter
ND-6520
RS-232 to RS-485/RS-422
Converter
ND-6510
Repeater
ND-6510
Repeater
NuDAM I/O
modules
NuDAM I/O modules
RS-485 bus
RS-232
RS-485 bus
ND-6510
Repeater
Terminator
RS-485 bus
NuDAM Modules
Terminator
Terminator
NuDAM Modules
NuDAM Modules

Introduction 1-7
1.7 Constructing a NuDAM Network
Go through the following steps, the user can construct a NuDAM
network easily.
1. Setup a ND-6520.
2. Connect the host computer with the ND-6520.
3. Setup one or more ND-6510 if necessary.
4. Connect the ND-6510 to extend to RS-485 bus if necessary.
5. Install the NuDAM utility software from disk.
6. Initialize the brand-new NuDAM modules.
7. Add the new NuDAM modules into RS-485 network.
Refer to chapter 2 for executing step 1 and 2. Refer to chapter 3
for executing step 3, 4 and for understanding the time to install
ND-6510. The knowledge about the software for operating the
NuDAM is in chapter 5. For executing the step 6 and step 7, refer
to chapter 4.
1.8 Termination Bus
In order to avoid signal reflections on the bus, each bus segment
has to be blanked off at its physical beginning and at its end with
the characteristic impedance. An termination resister ( Rt) is
intalled for this purpose. The Rt value - 120Ω±2% is
recommended, and the detailed connection of Rt can be referred
from the “Terminator Connection”diagram below.
Terminator Connection
Host
Data+
Data-
120 ohms
Data+
Data-
120 ohms

1-8 Introduction
1.9. Shielding
In case of increased interference, a shielded bus cables is
recommended to use for wiring between module and modules. In
addition, a shielding also should be done for the cable of power
supply and for the signal cables.
Some experiences and recommendations are concerning for
shield connection.
1. The shield should be connected with protective earthing at each
bus connection.
2. The shield should be applied additionally several times along
the course of the cable.
3. The Computer should be applied the shield directly to the
appliance or to separate shield rails.
DATA+
DATA -
Earthing Point
RS-485 Connection Cable
NuDAM Module
Isolation
braided shield

Introduction 1-9
1.10. How to Calculate Checksum Value
Format of NuDAM Commands
(LeadingCode)(Addr)(Command)(Data)[Checksum]<CR>
When checksum is enable then [Checksum] is needed, it is
2-character.
[Checksum] = ((LeadingCode)+(Addr)+(Command)+(Data)) MOD 0x100
Example 1: checksum is disable
User Command : $012<CR>
Response : !01400600
Example 2: checksum is enable
User Command : $012B7<CR>
Response : !01400600AC
‘ $’= 0x24 ‘ 0’= 0x30 ‘ 1’= 0x31 ‘ 2’= 0x30
B7 = ( 0x24 + 0x30 + 0x31 + 0x32 ) MOD 0x100
‘ !’= 0x24 ‘ 0’= 0x30 ‘ 1’= 0x31 ‘ 4’= 0x34
‘ 6’= 0x36
AC = ( 0x24 + 0x30 + 0x31 + 0x34 + 0x30 + 0x30 + 0x36 + 0x30
+ 0x30 ) MOD 0x100

NuDAM-6520 2-1
2. NuDAM-6520
2.1. Overview
What is NuDAM-6520 ?
NuDAM-6520 is a RS-232 to RS-422/RS-485 converter, it
converts the RS-232 signal to the RS-422/RS-485 signals. The
ND-6520 can be considered as an extension RS-422/RS-485
serial port for the host computer. A standard 9-pin D-type
connector is used to connect the host computer and the ND-6520.
Hence, the ND-6520 can connect with all kinds the PC, IPC or
Notebook PC, which install a standard RS-232 interface.
Features of NuDAM-6520
•RS-422/RS-485 transceiver
•Differenial 2-wire half-duplex RS-485
•Easily setup and installation
•Auto direction flow control
•Maximum 128 NuDAM on a bus without using repeaters
•Maximum 256 addressable NuDAM modules
•High transfer speed
•High isolation voltage
•Lower power consumption

2-2 NuDAM-6520
Specifications of NuDAM-6520
²Input
•Interface : standard RS-232 9 pin female D-type connector
•Speed (bps) : 1200(115.2K1), 2400, 4800, 9600, 19.2K,
38.4K, RTS
•Data Format : 9 bits, 10 bits, 11 bits, or 12 bits
²Output
•Interface : RS-485, differential, 2 half-duplex wires
RS-422, differential, 4 full-duplex wires
•Speed (bps) : 1200(115.2K1), 2400, 4800, 9600, 19.2K,
38.4K, RTS
•Max RS-485 network bus distance : 4000 ft. (1200m)
²Isolation
•Isolation voltage :5000 Vrms(between RS-422/RS-485
network and host computer)
²Bus
•Max loading : 128 NuDAMs on a RS-485 network
•Max modules : 256 NuDAMs with one ND-6510 repeater
²Power
•Power Supply : +10V to +30V
•Power Consumption : 0.95 W
Note 1: 115.2K is supported by version A1.2 or later.

NuDAM-6520 2-3
A Look at NuDAM-6520 & Pin Assignment
(RS-232 IN)
ND-6520
(R)+Vs
(B)GND
RS-232 to RS-485
/RS-422Converter
Switch Position Baud Rate
SW1: ON
RTS CTRL
SW2: ON
SW3: ON
SW4: ON
SW5: ON
SW6: ON
SW7: ON
115.2K bps
2400 bps
4800 bps
9600 bps
19.2K bps
38.4K bps
TX+
RX+
TX-

2-4 NuDAM-6520
Pin Definitions
Pin # Signal Name Description
1(Y)DATA+ RS-485 transmission line, positive
2(G)DATA- RS-485 transmission line, negative
4TX+ RS-422 transmission line, positive
5TX- RS-422 transmission line, negative
6RX+ RS-422 receiving line, positive
7RX- RS-422 receiving line, negative
9(R)+VS NuDAM power supply, +10V~+30V
10 (B)GND NuDAM ground
-- RS-232 IN 9-pin RS-232 connector
Connection Between Host and ND-6520
Host RS-232
RTS ’
GND •
TXD Ž
RXD •
ND-6520 RS-232
‡RTS
…GND
ƒTXD
‚RXD
Host
Computer
DATA +
DATA -
+Vs GND
NuDAM-6520
RS-232/RS-485
Converter
RS-232

NuDAM-6520 2-5
Functional Block Diagram
Power Regulator
Power Input
+10V ~ +30V
+5V
Isolation +5V
DC to DC
Converter
TXD
RXD
RTS
GND
Receiver
RS-232
/ Driver
SW1
Opto-Isolation
Switching
Communication
Controller
Direction Control
Communication
TVS : Transient Voltage Suppresser
PTC : Positive Temperature Coefficient
RS-422/RS-485
Receiver/Driver
Data+
Data-
Rx+
Rx-
Tx+
Tx-
PTC
TVS

2-6 NuDAM-6520
2.2. Setup
Objective of Setup
In normal condition, it is not necessary to setup the NuDAM-6520.
The default configuration of this communication module is 9600
bps and data format of 8 data bits with 1 start bit, 1 stop bit, and no
parity check. Note that the data format is reserved to be
compatible with other brand‘ s communication port, it should not
be modified if only NuDAM is used in a system. The baud rate
can be configured according applications’requirement.
Setup Equipments
Only screw driver is used to open the case. Software, power
supply, and wiring are not necessary.
Setup Procedure
Only hardware switch setting can be setup in ND-6520. The user
can set the speed of the serial interface ( RS-232 and RS-
422/RS-485 ), and the serial data format. The speed and the data
format on the whole RS-485 network must be identity otherwise
the communication will be not correct.
To setup the ND-6520, use the screw driver to open the case, then
change the switch setting. The new setting is available after power
on. The case must be put back and locked carefully. Note that do
not scratch the surface of the circuit while setting up, otherwise the
surface coating or even the circuits will be damaged.
Default Setting
•9600 baud rate
•10 bits series data format : one start bit, eight data bits, one
stop bit, no parity check
SW1 Setting