Omega Products D6700 Installation Manual

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D6000 SERIES

Digital Transmitters,

Modbus RTU, RS-485 Output

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User’s Guide

Extended Warranty

Program

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Table of Contents:

1.0 Introduction

2.0 Configuration

2.1 Getting Started

3.0 Communications

3.1 RS-485 Serial

4.0 Module Types

4.1 D6100 Seven Channel Voltage Input Module

4.1.1 Analog to Digital Converter

4.1.2 Connector Pin Assignments

4.1.3 Factory Initial Values

4.1.4 Features Register Assignments

4.1.5 Calibration Procedure

4.2 D6200 Seven Channel Current Input Module

4.2.1 Analog to Digital Converter

4.2.2 Connector Pin Assignments

4.2.3 Factory Initial Values

4.2.4 Features Register Assignments

4.2.5 Calibration Procedure

4.3 D6300 Seven Channel Thermocouple Module

4.3.1 Analog to Digital Converter

4.3.2 Connector Pin Assignments

4.3.3 Factory Initial Values

4.3.4 Features Register Assignments

4.3.5 Calibration Procedure

4.4 D6400 Seven Channel Voltage, Thermocouple, Current Input Module

4.4.1 Analog to Digital Converter

4.4.2 Features Register Assignments

4.4.3 Factory Initial Values

4.4.4 Calibration Procedure

4.4.5 Connector Pin Assignments

4.4.6 D6400 Current Channel Enable

4.5 D6500 Two Channel Analog Output Module

4.5.1 Analog Outputs

4.5.2 Features Register Assignments

4.5.3 Factory Initial Values

4.5.4 Voltage Output Calibration Procedure

4.5.5 Current Output Calibration Procedure

4.5.6 Analog Output Calibration Register Tables and Values

4.6 D6710 Fifteen Bit Digital Input Module

4.6.1 Digital Inputs

4.6.2 Connector Pin Assignments

4.6.3 Factory Initial Values

4.6.4 Features Register Assignments

4.7 D6720 Fifteen Bit Digital Output Module

4.7.1 Digital Outputs

4.7.2 Connector Pin Assignments

4.7.3 Factory Initial Values

4.7.4 Features Register Assignments

4.7.5 Communications Watchdog Timer

1

5.0 Modbus Protocol

5.0 Functions

5.1 Function 01 – Read Coil Status

5.2 Function 02 – Read Input Status

5.3 Function 03 – Read Holding Registers

5.4 Function 04 – Read Input Registers

5.5 Function 05 – Force Single Coil

5.6 Function 06 – Preset Single Register

5.7 Function 0F – Force Multiple Coils

5.8 Function 10 – Preset Multiple Registers

6.0 Modbus Exception Error Codes

6.0 Modbus Register Assignments

6.1 Seven Channel Voltage Input Register Assignments

6.2 Seven Channel Current Input Register Assignments

6.3 Seven Channel Thermocouple Input Register Assignments

6.4 Seven Channel Voltage, Thermocouple and Current Input Register Assignments

6.5 Two Channel Analog Voltage and Current Output Register Assignments

6.6 Fifteen Bit Digital Output Register Assignments

6.7 Fifteen Bit Digital Input Register Assignments

7.0 Calibration Procedures

7.1 Seven Channel Voltage Input Module

7.2 Seven Channel Current Input Module

7.3 Seven Channel Thermocouple Input Module

7.4 Seven Channel Voltage, Thermocouple and Current Input Module

7.5 Two Channel Analog Voltage and Current Output Module

7.6 Fifteen Bit Digital Output Module

7.7 Fifteen Bit Digital Input Module

2

1.0 Introduction

The D6000 series RS-485 serial interface modules are a complete family of data acquisition
modules. The family of modules includes multi-channel analog input measurement modules,
multiple channel analog output modules, and digital modules.

The D6000 series modules communicate using the Modbus RTU protocol. This protocol very
popular in the data acquisition market and is supported by almost every commercial data
acquisition program in the market today. Thus providing access to wide variety of software control
programs that can meet almost any application budget.

The D6000 series analog input modules contain seven differential analog input channels and can
measure voltages, current, and thermocouples. There are four versions available, the D6100,
D6200, D6300 and the D6400. The D6100 module can measure DC voltage signals. The D6200
module can measure seven 4-20mA current loops. The D6300 series can measure eight user­selectable thermocouple types. The D6400 series can measure six selectable voltage input
ranges, one current input range, and eight selectable thermocouple types.

The D6500 series analog output modules contain two output channels for generating either a
voltage or current output signal. Each analog output channel is user-selectable as either a voltage
or a current output. These analog output signals can be used as control inputs for items such as
motor controls, valve controls, and other control devices. Each analog output channel also
contains a programmable communications watchdog timer for instances when communications to
the module is lost.

The D6700 series digital input and output modules each contain 15-bits of input or output. The
digital input modules contain internal pull-ups on each bit for direct connection of dry contact
switches. The digital outputs are open-collector outputs that can be connected up to 30Vdc and
can sink 100mA per bit. The open-collector allows the modules to be used in a wider variety of
control applications. The digital output module also contains a programmable watchdog timer for
instances where communications to the module is lost.

Mixing and matching the D6000 series modules together in an application provides a user with all
the measurement and control hardware for a complete process control system.

3

1.0 Configuration & Getting Started

Default Mode

All D6000 series modules contain an EEPROM (Electrically Erasable Programmable Read Only
Memory) to store setup information and calibration constants. The EEPROM replaces the usual
array of switches and pots necessary to specify baud rate, address, parity, etc. The memory is
nonvolatile which means that the information is retained even if power is removed. No batteries
are used so it is never necessary to open the module case.

The EEPROM provides tremendous system flexibility since all of the module’s setup parameters
may be configured remotely through the communications port without having to physically change
switch and pot settings. There is one minor drawback in using EEPROM instead of switches;
there is no visual indication of the setup information in the module. It is impossible to tell just by
looking at the module what the baud rate, address, parity and other settings are. It is difficult to
establish communications with a module whose address and baud rate are unknown. To
overcome this, each module has an input pin labeled DEFAULT*. By connecting this pin to
Ground, the module is put in a known communications setup called Default Mode.

The Default Mode settings are: 9600 baud, one start bit, eight data bits, one stop bit, no parity,
any address is recognized. The module will answer to address “01” in the Default Mode.

Grounding the DEFAULT* pin does not change any of the setups stored in EEPROM. The setup
information may be read back to determine all of the setups stored in the module.

Setup information in a module may be changed at will in the Default Mode. The baud rate and
parity setups may be changed without affecting the Default Mode values of 9600 baud and no
parity. When the DEFAULT* pin is released, the module automatically performs an internal reset
and configures itself to the baud rate and parity stored in the setup information.

The Default Mode should only be used with a single module connected to a computer for the
purpose of identifying and modifying setup values. In most cases, a module in Default Mode may
not be used in a string with other modules.

Communications Connections

The D6000 series module must be connected to a host computer with an RS-485 serial port for
configuration. For computers that contain an internal RS-232 port then the A1000 RS-232 to RS­485 serial converter can be used to connect the module to a computer. For computers without
internal serial ports then a USB to RS-485 converter can be used to connect the module to a
computer. The RS-485 serial connections for both devices are detailed below.

A1000 RS-485 Connections

A1000 RS-485 Out Connector D6000 Module Connector

(B) GND GND

(R) +VS +VS
(G) DATA- DATA­(Y) DATA+ DATA+

USB to RS-485 Connections

Your USB Connector D6000 Module Connector

Ground GND

Data- DATA-

Data+ DATA+

Note: When using the USB converter a separate power supply will be
required and connected between the +VS and GND terminals.

4

DEFAULT Mode Connection

For simplicity, we recommend performing all the setups while in the Default Mode. Place the
D6000 in Default Mode by connecting the DEFAULT* terminal to the GND terminal using a
jumper wire. When the module is in the Default Mode the serial parameters are internally set to:
9600 Baud, 8 data bits, no parity and one stop bit. The module will respond to Modbus Slave
address “01”.

Note: No other wiring connections are required on the analog or digital I/O pins to perform the
module configuration.

1.1 Getting Started

The first step towards “Getting Started” with your D6000 series module is to connect the module
to an RS-485 serial port using the wiring connections above. Included within the wiring
connections is the “Default*” line being connected to the power supply ground. This connection
places the module in the “Default Mode”. The Default Mode forces the module into a known
communications state and is best utilized for configuring the module. The Default Mode serial
communications parameters are: 9600 baud, eight data bits, no parity and one stop bit. The
module will answer to Modbus Slave address “1” (0x01).

The D6000 series modules require a software program to change the setup register values. Since
the modules communicate via the Modbus RTU protocol, a Modbus Master program or the
D6000 series Utility Software will be required to change the module configuration.

The D6000 Series Utility Software is the best program to use when configuring a module. The
utility software reads the module information, displays the information in easy to understand
terms, allows changes to be made via drop-down list boxes and then writes the new values back
to the module. The module parameters can also be stored to disk and recalled at a later date.

The D6000 series Utility Software is provided free of charge on CDROM with a purchase order
and the latest version is always downloadable from www.omega.com. The utility software runs on
Windows based computers. Simply insert the CDROM into the CDROM drive, or download the
Setup.Exe file from the website, and then run the SETUP.EXE installation file. The software will
install and create a menu section called “Omega Utility Software” and the Utility Software will be
under that selection.

From the computer desktop select the “start” button, select “all programs”, select “Omega Utility
Software” and then select “D6000 Series Utility Software” to run the utility software. When the
software opens the first step is to select, configure and open the host serial communications port
where the module is connected.

5

Select the “Serial Port” connection type in the upper left corner of the program screen and then
select the proper communications port in the upper right hand corner of the screen. Next, press
the Serial Port “Settings” button.

If the “Default*” line is connected to ground then select 9600 baud, no parity, eight data bits, one
stop bit, RTS Only handshaking and the Tx and Rx delays can be left in their default state.
Otherwise, adjust the communications settings to match the settings in the connected module.

Press the “Open Port” or “Update” button to complete the serial port configuration process.

Test Communications

After the utility software serial port has been configured the next step would be to check for valid
communications between the computer and the module. You must have valid communications
with the module before trying to perform the configuration process. To test the communications,

6

set the Modbus Address to 01 in the “Default Mode” or set the Modbus Address to match the
setting in the module. Set the Function selector to 03 and the Register selector to 40001. Press
the “Send” button to verify communications. A module response will be shown in the figure below.

The figure above illustrates the Modbus function 03 being sent to Modbus Slave address 01. Both
the command and response messages are displayed beginning with CMD and RSP respectively.
This display format is provided for troubleshooting purposes as it displays each byte of
information being sent to and received from the module. This format can be a good
troubleshooting tool or a way to become familiar with the formatting of the Modbus RTU protocol.

The response data value from register 40001 is located in the RSP: line. The data value returned
is a 16-bit value located in the fourth and fifth bytes in the message (00 01). The “00 01” indicates
that the register value is 0001. From the 7CH Current Input Modbus Register map, register 40001
is the Modbus Slave address value. In the case the module slave address value is read back as

0001.
In the event that the module was not detected by the software then the RSP: line would say

“RSP: Timeout – No Response Detected!”. Several things can contribute to this problem. Some
examples are no power to the module, bad RS-485 wiring connection(s), invalid port settings, or
RS-485 half-duplex handshaking problems all can cause timeout errors. Timeout errors must be
corrected before attempting to configure a module.

Setup a Module

After a successful communications test has been performed then the module can be configured.
Select the type of module using the drop-down list box under “Quick Setup” in the lower left hand
corner of the screen. Then press the “Setup” button. A new screen (see below) will appear that
contains list of all the user-selectable module values. Several different screens can appear. Each
screen is specific to the type of module connected. The screen below is for a seven channel
current input module.

7

Ensure that the Module Address in the lower left corner is 01 and then press the “Read Setup”
button. The screen will now populate with the existing configuration data inside the module.

The user-selectable values will be displayed in an easy to understand format and new selections
can be made using the drop-down list boxes. The drop-down list boxes make the configuration
process easy and accurate because erroneous values cannot be entered.

8

Once the new module configuration settings have been changed to meet the application
requirements then press the “Apply” button to transmit the new settings.

Scan Module Data Values

After the module has been properly configured, the analog input module configuration screens
can poll modules in order to verify the data from each channel. This feature is a good
troubleshooting or verification tool when the analog input signals are physically connected to the
module.

The analog input screens contain a “Scan” button that will start the scanning process. Each data
channel is read by requesting the data values from data registers within the module. The analog
input data registers can be found in the Modbus Register map and the data register locations are
specific to the module type.

The data values are returned in hexadecimal percentage of Full Scale format where a value of
0x0000 represents the minus full scale input of the module. A value of 0xffff represents the
positive full scale input of the module. These values can be used as check to ensure that the
channels are operating properly when analog input signals are applied to the input terminals.

The data values can also be displayed as a numerical value. The utility software knows the plus
and minus full scale input limits for each channel. Using the raw hexadecimal percentage of full
scale data values the software can convert these readings to millivolts, milliamps, or temperature
readings. Simply uncheck the “Display Hex Values” selection underneath the channel readings to
display the numeric values.

The scanning process will also log and display the highest (peak) and lowest (valley) readings
that were recorded during the scanning process. This is just for indication purposes only.

A scan interval slide control is also provided to speed up or slow down the scanning process. This
slide control allows the channels to be scanned at intervals from 0.5 to 5 seconds.

9

3.0 Communications

Each D6000 series module contains a two-wire RS-485 serial interface for communications. The
RS-485 communications standard was developed to satisfy the need for multi-dropped systems
that can communicate at high data rates over long distances. RS-485 is similar to RS-422 in that
it uses a balanced differential pair of wires switching from 0 to 5V to communicate data. RS-485
receivers can handle common mode voltages from -7V to +12V without loss of data, making them
ideal for transmission over great distances. RS-485 differs from RS-422 by using one balanced
pair of wires for both transmitting and receiving. Since an RS-485 system cannot transmit and
receive at the same time it is inherently a half-duplex system.

RS-485 offers many advantages:

1) balanced line gives excellent noise immunity

2) can communicate with modules at high baud rates

3) communicate at distances up to 4,000 feet.

4) true multi-drop configuration as the modules are connected in parallel

5) individual modules may be disconnected without affecting other modules

6) up to 32 modules on one segment of the communications line; 247 with repeaters

7) simplified wiring using standard telephone cable
Figure 2.0 below illustrates the wiring required for multiple-module RS-485 system. Notice that

every module has a direct connection to the host system. Any number of modules may be
unplugged without affecting the remaining modules. Each module must be setup with a unique
address and the addresses can be in any order. Also note that the connector pins on each
module are labeled with notations (B), (R), (G), and (Y).

Figure 2.0 Typical RS-485 Serial Communications System Architecture

This designates the colors used on standard 4-wire telephone cable:
(B) GND Black Wire

(R) V+ Red Wire
(G) DATA* Green Wire (RS-485 DATA-)
(Y) DATA Yellow Wire (RS-485 DATA+)

This color convention can be used to simplify installation. If standard 4-wire telephone cable is
used, it is only necessary to match the labeled pins with the wire color to guarantee correct
installation. The RS-845 data lines are designated on the label as DATA* and is the complement
of DATA (negative true). To minimize unwanted reflections on the transmission line, the bus

10

should be arranged as a line going from one module to the next. ‘Tree’ or random structures of
the transmission line should be avoided. For wire runs greater than 500 feet, each end of the line
should be terminated with a 220 ohm resistor connected between DATA and DATA*.

When using a bi-directional RS-485 system, there are unavoidable periods of time when all
stations on the line are in receive mode. During this time, the communications lines are left
floating and are very susceptible to noise. To prevent the generation of random characters, the
lines should be biased in a MARK condition as shown in Figure 2.0. The 1K resistors are used to
keep the DATA line more positive than the DATA* line when none of the RS-485 communications
transmitters are on.

When enabled, the low impedance of an RS-485 driver easily overcomes the load presented by
the resistors. Special care must be taken with very long busses (greater than 1000 feet) to ensure
error-free operation. Long busses must be terminated as described above. The use of twisted
cable for the DATA and DATA* lines will greatly enhance signal fidelity.

In situations where many modules are used on a long line, voltage drops in the power leads
becomes an important consideration. The GND wire is used both as a power connection and the
common reference for the transmission line receivers in the modules. Voltage drops in the GND
leads appear as a common-mode voltage to the receivers. The receivers are rated for a
maximum of -7Vdc of common-mode voltage. For reliable operation, the common mode voltage
should be kept below -5V. To avoid problems with voltage drops, modules may be powered
locally rather than transmitting the power from the host.

Inexpensive ‘calculator’ type power supplies are useful in remote locations. When local supplies
are used, be sure to provide a ground reference with a third wire to the host or through a good
earth ground. With local supplies and an earth ground, only two wires for the data connections
are necessary.

11

4.0 Module Types

The D6000 series RS-485 serial interface modules are a complete family of data acquisition
modules. Mixing and matching the D6000 series modules together in an application provides a
user with all the measurement and control hardware to build a complete process control system.
The family of modules includes multi-channel analog input measurement modules, multiple
channel analog output modules, and digital modules.

D6100 Voltage Input Module

The D6100 series analog input modules contain seven differential inputs for measuring DC
voltages. Each input can be individually configured to measure one of six different voltage
ranges. The input ranges are: +/-0.025V, +/-0.05V, +/-0.10V, +/-1V, +/-5V and +/-10V.

D6200 Current Input Module

The D6200 series analog input module contains seven differential inputs for measuring current
signals such as 4-20mA loops. The analog input range is factory configured for +/-20mA.

D6300 Thermocouple Input Module

The D6300 series analog input module contains seven differential inputs for measuring
thermocouple probes. Each input can be individually configured to measure one of eight different
thermocouple types. The supported thermocouple types are: J, K, T, E, R, S, B and C.

D6400 Voltage, Thermocouple and Current Input Module
The D6400 series analog input module contains seven differential inputs for measuring DC

voltages, thermocouples and current. Each input can be individually configured to measure one of
fourteen different ranges. The supported thermocouple types are: J, K, T, E, R, S, B and C. The
DC voltage input ranges are: +/-0.025V, +/-0.05V, +/-0.10V, +/-1V, +/-5V and +/-10V and the
current input range is +/-20mA.

D6500 Analog Output Module

The D6500 series analog output modules contain two analog output channels for generating
either a voltage or current output signal. Each analog output channel contains two user-selectable
voltage output ranges and two current output ranges. These analog output signals can be used
as control inputs for items such as motor controls, valve controls, and other control devices. Each
analog output channel also contains a programmable communications watchdog timer for
instances when communications to the module is lost.

D6700 Digital Inputs/Output Module

The D6700 series modules each contain 15-bits of digital inputs or digital outputs. The D6710 15­bit digital input module contains internal pull-ups on each bit for direct connection to dry contact
switches.

The D6720 digital output modules contain fifteen open-collector outputs that can be connected up
to 30Vdc and can sink 100mA per bit. The open-collector outputs allow the modules to be used in
a wide variety of control applications. The digital output module also contains a programmable
communications watchdog timer for accidental instances where communication to the module is
lost.

12

4.1 D6100 - Seven Channel Voltage Input Module

Overview

The D6100 series analog input modules contain seven differential analog inputs that can
measure six different DC voltage ranges. Each analog input channel is user programmable and
may be assigned to measure a different range. Any unused channels can be disabled.

Analog to Digital Converter

The D6100 series analog input modules contain a 16-bit analog to digital converter to perform the
signal conversion to digital information. The analog to digital converter performs a total of 25
conversions per second. Meaning, if all 7 channels were enabled the each channel would be
measured 3+ times per second. The conversion rate per channel can be improved by disabling
any unused channels.

Features and Register Assignments

The D6100 series analog input modules contain many user-selectable features. The user can
select all features such as baud rate, parity type, analog range selection and digital filtering. The
complete list of features is illustrated in the “Seven Analog Voltage Input Register Assignments”
register map below. The register map format is used for consistency with the Modbus RTU
protocol. The register map contains the register numbers in decimal format, register description,
acceptable data values, and list of what each value means. These registers can be written to
using most any Modbus master program or using the D6000 series utility software.

Note: All Modbus Register values in the tables below are represented as “decimal” numbers.

Factory Initial Values

The D6100 series analog module features are initialized at the factory with a set of “Initial
Values”. A complete list of factory “Initial Values” can be found in the table below. For reference
purposes, the Modbus Slave address is preset to hex 0x01, the baud rate is 9600, Parity type is
None and the Stop Bits is “1”.

Calibration

The D6100 series analog input modules are shipped from the factory as fully calibrated devices.
Throughout the lifetime of the module there may be need to verify or adjust the calibration of the
device. The verification and adjustment process should only be completed using NIST traceable
calibration equipment. A D6100 series Calibration procedure is included below.

Connector Pin Designations

The D6100 series module uses two 3.81mm removable plugs for connecting signals to the
module. One six-pin connector is for the power supply and the host RS-485 data line
connections. A second sixteen-pin connector is used to connect analog input signals to the
module. The pin designations for each connector are printed on the module label and are listed in
a table below.

13

4.1.2 Seven Voltage Input Pin Assignments and Specifications

Connections
Power & Serial Communications

Pin Number Pin Designator
1 GND - Power Supply
2 +VS + Power Supply
3 Data- RS-485 Data­ 4 Data+ RS-485 Data+
5 Default* Default*
6 GND - Power Supply

Analog Input Pin Assignments

Pin Number Pin Designator
1 CH1+ CH1 +Input
2 CH1- CH1 -Input
3 CH2+ CH2 +Input
4 CH2- CH2 -Input
5 CH3+ CH3 +Input
6 CH3- CH3 -Input
7 CH4+ CH4 +Input
8 CH4- CH4 -Input
9 CH5+ CH5 +Input
10 CH5- CH5 -Input
11 CH6+ CH6 +Input
12 CH6- CH6 -Input
13 CH7+ CH7 +Input
14 CH7- CH7 -Input
15 ISO. GND Isolated GND
16 ISO. GND Isolated GND

Specifications

Analog Inputs 7 Channels
User Selectable Input Ranges

Bipolar Voltage 10V, 5V, 1V,

Differential Reading
CH to CH

Protocol
Serial Modbus RTU

Power Supply
Voltage +10-30Vdc
Power 1.4W

Connectors
Spacing 3.81mm
Max Wire Size 14-24 AWG
Max Current 8 Amperes

Serial LED Displays
Transmit (Top) Serial TxData
Receive (Bottom) Serial RxData

0.1V, 0.05V,

0.025V

14

4.1.3 Seven Voltage Input Initial Values

Module Parameter Value

Slave Address 1
Baud Rate 9600
Parity Type None
Modbus Response Delay 3mS
Modbus Query Delay 0mS
Conversion Rate 60Hz
Large Signal Filter 0 Seconds
Small Signal Filter 0 Seconds
Channel 0 Range +/-10Vdc
Channel 1 Range +/-10Vdc
Channel 2 Range +/-10Vdc
Channel 3 Range +/-10Vdc
Channel 4 Range +/-10Vdc
Channel 5 Range +/-10Vdc
Channel 6 Range +/-10Vdc

15

4.1.4 Seven Voltage Input Register Assignments

Register Description Function Value Description

40001 Slave Address R/W 1-DF Factory set to 0x0001.
40002 UART Setup R/W Bits 0-4 Baud Rate

5=9600
6=19.2K
7=38.4K
8=57.6K
9=115.2K

Bits 5-6 Parity
0=No Parity, 8-N-2
1=Odd
2=Even
3=No Parity, 8-N-1

Factory set to 0x0035 = 9600, 8, N, 1.

40003 Modbus Delays R/W 0-303F Bits 0-7

The Response Delay in milliseconds. This is
required when the RS-485 adapter cannot
tri-state immediately after the last character
is transmitted from the host. Maximum value
is 63mS. Factory default value is 3.

Bits 8-15
The End of Query Delay in milliseconds
(48mS max). This is an additional time that
the module will wait prior to marking the end
of the message. Slower host computers may
not be able transmit a continuous message
stream, thereby creating gaps between
characters exceeding the normal 3.5
character times limit. Factory default value is

0.

Factory set, 0x0003.

40033 Software Version R Factory set, Code Version.
40048 Last Converted

Chan,
Conversion
Counter

40049 Channel 0 Data R 0-FFFF Data - Ch 0, Offset binary, zero=0x8000.
40050 Channel 1 Data R 0-FFFF Data - Channel 1
40051 Channel 2 Data R 0-FFFF Data - Channel 2
40052 Channel 3 Data R 0-FFFF Data - Channel 3
40053 Channel 4 Data R 0-FFFF Data - Channel 4
40054 Channel 5 Data R 0-FFFF Data - Channel 5
40055 Channel 6 Data R 0-FFFF Data - Channel 6

R 0-06FF Bits 0-7

The counter increments each conversion and
rolled over after FF. The Conversion Counter
indicates when the data registers have been
updated.
Bits 8-10
Input channel last conversion stored. The
information is useful when all channel data is
read back with 1 query. The user can identify
which channels have been converted since
the last query as long as the time between
queries is less than 8 conversion times.
Initialized to ‘0x0000’ on device reset.

16

40095 Misc. Setup R/W 0-1 Bit 0 – Normal Mode Rejection Setting

0 – 60Hz, 25 Hz Conversion Speed.
1 – 50Hz, 20 Hz Conversion Speed.

Factory set to 0x0000.

40096 Signal Filtering R/W 0-3F This register controls all channels. Time

constants are only approximate values.
Bits 0-3 Small Filter Time Constant(Secs)
0 0
1 0.5
2 1
3 2
4 4
5 8
6 16
7 32

Bits 4-7 Large Filter Time Constant(Secs)
0 0
1 0.5
2 1
3 2
4-7 Reserved

Factory set to 0x0000.

40097 Setup Channel 0 R/W 0-F Channel 0 range. Non-volatile write

protected register. If the EEPROM cannot be
written because of not being enabled, it
replies with a Negative Acknowledge
Exception response 07h. Modbus function
code 10h is limited to 4 data values.

Range: Bits 0-7 Hex
Disable Channel 00
+/-10V 01
+/-5V 02
+/-1V 03
+/-0.100V 04
+/-0.050V 05
+/-0.025V 06

Factory set to 0x0001.

40098 Setup Channel 1 R/W 0-F Holds Channel 1 range.

Factory set to 0x0001.

40099 Setup Channel 2 R/W 0-F Holds Channel 2 range.

Factory set to 0x0001.

40100 Setup Channel 3 R/W 0-F Holds Channel 3 range.

Factory set to 0x0001.

40101 Setup Channel 4 R/W 0-F Holds Channel 4 range.

Factory set to 0x0001.

40102 Setup Channel 5 R/W 0-F Holds Channel 5 range.

Factory set to 0x0001.

40103 Setup Channel 6 R/W 0-F Holds Channel 6 range.

Factory set to 0x0001.

40114 Trim Zero, 10V

Range

40115 Trim Zero, 5V

Range

40116 Trim Zero, 1V

Range

WP 0 Forces all Channel Data Registers to 8000h,

with input signal equal to zero. Apply
calibration signal at least 15 seconds prior to
calibrating to all channels. Calibration
Acknowledge Exception Response.
Calibration takes 20 seconds.

WP 0 Refer to Modbus register 40114.
WP 0 Refer to Modbus register 40114.

17

40117 Trim Zero, 0.1V

Range

40118 Trim Zero, 0.05V

Range

40119 Trim Zero,

0.025V Range

40146 Trim FS, 10V

Range

40147 Trim FS, 5V

Range

40148 Trim FS, 1V

Range

40149 Trim FS, 0.1V

Range

40150 Trim FS, 0.05V

Range

40151 Trim FS, 0.025V

Range

40241 Control Register

Functions:

R Read Only
R/W Read/Write
WP Write-Protected

WP 0 Refer to Modbus register 40114. Apply

calibration signal at least 1 minute prior to
calibrating to all channels.

WP 0 Refer to Modbus register 40114. Apply

calibration signal at least 1 minute prior to
calibrating to all channels.

WP 0 Refer to Modbus register 40114. Apply

calibration signal at least 1 minute prior to
calibrating to all channels.

WP D000-

FFFE

WP D000-

FFFE

WP D000-

FFFE

WP D000-

FFFE

WP D000-

FFFE

WP D000-

FFFE

W

Forces all Channel Data Registers to written
value, with appropriate input signal. Apply
calibration signal at least 15 seconds prior to
calibrating to all channels. Acknowledge
Exception Response. Calibration takes 20
seconds. See note 1.
See Modbus Register 40146.

See Modbus Register 40146.
See Modbus Register 40146. Apply

calibration signal at least 1 minute prior to
calibrating to all channels.
See Modbus Register 40146. Apply
calibration signal at least 1 minute prior to
calibrating to all channels.
See Modbus Register 40146. Apply
calibration signal at least 1 minute prior to
calibrating to all channels.

0 – Normal operation (NOP)
1 – Remote Reset (write protected)
2 – Write Enable
5 – Initialize Host Communication setup

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4.1.5 Seven Channel Voltage Input Module Calibration Procedure
Required Equipment:

1. Computer running the D6000 Utility Software or another Modbus Master program.

2. A NIST traceable DC Voltage Standard with +/-10Vdc range.

Setup Steps – Perform Calibration Steps in Order Listed:

1. Allow unit to warm up for 15 minutes.

2. Short all the +Input pins together using short jumper wires.

3. Short all the -Input pins together using short jumper wires.

4. Connect the +Input wires to the Positive terminal on the DC voltage calibrator.

5. Connect the -Input wires to the Negative terminal on the DC voltage calibrator.

6. Install the D6000 Utility Software or another Modbus Master Program to communicate
with, and calibrate with the module via serial port or a TCP/IP connection.

Trim Zero:

1. Set the DC calibrator voltage output to +0.0000Vdc.

2. Use the D6000 Utility Software or a Modbus Master program to perform steps #3 & #5.

3. Set all channels to the same range. Start with +/-10Vdc range, work downward as per
values in Table 1.0.

4. Trim Zero on all channels.

a. Write a value of 0x0002h to Control Register 40241 to Write-Enable the module.
b. Retrieve Trim Zero register value for specific range from Table 2.0 below.
c. Write value of 0x00h to Range Trim Zero register, (ie. 40114 for +/-10V).
d. Perform steps #4a through #4c to trim zero on each range.

Trim Span:

1. Set the DC calibrator voltage output to +10.000Vdc.

2. Use the D6000 Utility Software or a Modbus Master program to perform steps #3 & #5.

3. Set all channels to the same range. Start with +/-0.025Vdc range, work upward as per
values in Table 3.0.

4. Trim Span on each channel.

a. Write a value of 0x0002h to Control Register 40241 to Write-Enable the module.
b. Retrieve Trim Span register value for specific range from Table 2.0 below.
c. Write value of 0xfffe to Trim Span register, (ie. 40146 for +/-10V).
d. Perform steps #4a through #4c to trim span on each range.

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4.1.6 Seven Channel Voltage Input Calibration Tables:

Seven Channel Range Register Values

Channel Range Control Range Values

Channel 0 40097
Channel 1 40098
Channel 2 40099
Channel 3 40100
Channel 4 40101
Channel 5 40102
Channel 6 40103

Table 1.0 Register Setup Values.

00 Disabled
01 +/-10V
02 +/-5V
03 +/-1V
04 +/-0.1V
05 +/-0.05V
06 +/-0.025V

Trim Zero Registers and Calibration Values

Range Register Value

+/-10Vdc 40114 0000

+/-5Vdc 40115 0000
+/-1Vdc 40116 0000

+/-0.1Vdc 40117 0000

+/-0.05Vdc 40118 0000

+/-0.025Vdc 40119 0000

Table 2.0 Trim Zero Registers and Values.

Trim Span Registers and Calibration Values

Range Register Value

+/-0.025Vdc 40151 FFFE

+/-0.05Vdc 40150 FFFE

+/-0.1Vdc 40149 FFFE

+/-1Vdc 40148 FFFE
+/-5Vdc 40147 FFFE

+/-10Vdc 40146 FFFE

Table 3.0 Trim Span Registers and Values.

20

4.2 D6200 - Seven Channel Current Input Module

Overview

The D6200 series analog input module contains seven differential analog inputs for measuring
current signals such as 4-20mA loops. Each analog input channel can measure current signals
up to +/-20mA. Any unused channels can be disabled.

Analog to Digital Converter

The D6200 series analog input modules contain a 16-bit analog to digital converter to perform the
signal conversion to digital information. The analog to digital converter performs a total of 25
conversions per second. Meaning, if all 7 channels were enabled the each channel would be
measured 3+ times per second. The conversion rate per channel can be improved by disabling
any unused channels.

Features and Register Assignments

The D6200 series analog input modules contain many user-selectable features. The user can
select all features such as baud rate, parity type, analog range selection and digital filtering. The
complete list of features is illustrated in the “Seven Channel Analog Current Input Register

Assignments” register map below. The register map format is used for consistency with the

Modbus RTU protocol. The register map contains the register numbers in decimal format, register
description, acceptable data values, and list of what each value means. These registers can be
written to using most any Modbus master program or using the D6000 series utility software.

Note: All Modbus Register values in the tables below are represented as “decimal” numbers.

Factory Initial Values

The D6200 series analog module features are initialized at the factory with a set of “Initial
Values”. A complete list of factory “Initial Values” can be found in the table below. For reference
purposes, the Modbus Slave address is preset to hex 0x01, the baud rate is 9600, Parity type is
None and the Stop Bits is “1”.

Calibration

The D6200 series analog input modules are shipped from the factory as fully calibrated devices.
Throughout the lifetime of the module there may be need to verify or adjust the calibration of the
device. The verification and adjustment process should only be completed using NIST traceable
calibration equipment. A D6200 series Calibration procedure is included below.

Connector Pin Designations

The D6200 series module uses two 3.81mm removable plugs for connecting signals to the
module. One six-pin connector is for the power supply and the host RS-485 data line
connections. A second sixteen-pin connector is used to connect analog input signals to the
module. The pin designations for each connector are printed on the module label and are listed in
a table below.

21

4.2.2 Seven Channel Current Input Specifications

Connections
Power & Serial Communications

Pin Number Pin Designator
1 GND - Power Supply
2 +VS + Power Supply
3 DATA- RS-485 Data­ 4 DATA+ RS-485 Data+
5 Default* Default*
6 GND - Power Supply

Analog Input Pin Assignments

Pin Number Pin Designator
1 CH1+ CH1 +Input
2 CH1- CH1 -Input
3 CH2+ CH2 +Input
4 CH2- CH2 -Input
5 CH3+ CH3 +Input
6 CH3- CH3 -Input
7 CH4+ CH4 +Input
8 CH4- CH4 -Input
9 CH5+ CH5 +Input
10 CH5- CH5 -Input
11 CH6+ CH6 +Input
12 CH6- CH6 -Input
13 CH7+ CH7 +Input
14 CH7- CH7 -Input
15 ISO. GND Isolated GND
16 ISO. GND Isolated GND

Specifications

Analog Inputs 7 Channels
Input Range

Current +/-20mA
Differential Reading

CH to CH +/-10Vdc
Protocol

Serial Modbus RTU
Power Supply

Voltage +10-30Vdc
Power 1.4W

Connectors
Spacing 3.81mm
Max Wire Size 14-24 AWG
Max Current 8 Amperes

Serial LED Displays
Transmit (Top) TxData
Receive (Bottom) RxData

22