Fisher ControlWave HART Device Interface (HDI) Manuals & Guides

Part D301737X012

March 2015

ControlWave® HART® Device Interface (HDI)
Instruction Manual

Remote Automation Solutions

HART Device Interface Instruction Manual

Page

Revision

2.5

Mar-15

Initial issue

May-13

Revision Tracking Sheet

March 2015

This manual may be revised periodically to incorporate new or updated information. The revision date
of each page appears at the bottom of the page opposite the page number. A change in revision date
to any page also changes the date of the manual that appears on the front cover. Listed below is the
revision date of each page (if applicable):

ii Rev Mar-15

HART Device Interface Instruction Manual

Contents

Chapter 1 – General Information 1-1

1.1 Scope of Manual ............................................................................................................................1-1

1.2 HDI Overview .................................................................................................................................1-1

1.3 Hardware ........................................................................................................................................1-3

1.3.1 HDI Connectors ...............................................................................................................1-4

1.3.2 HDI Status LEDs ..............................................................................................................1-6

1.3.3 HDI Circuitry .....................................................................................................................1-6

1.4 Additional Technical Information ....................................................................................................1-6

Chapter 2 – Installation and Use 2-1

2.1 Installation Requirements ...............................................................................................................2-1

2.1.1 Restrictions and Assumptions..........................................................................................2-1

2.1.2 HART Remote Devices ....................................................................................................2-2

2.2 Configuring a Single HDI ................................................................................................................2-2

2.2.1 RS-485 Interface Communications ..................................................................................2-2

2.2.2 RS-232 Interface Communications ..................................................................................2-5

2.3 Configuring Multiple HDIs ..............................................................................................................2-7

2.3.1 RS-485 Interface Communications ..................................................................................2-7

2.3.2 RS-232 Interface Communications ..................................................................................2-9

Rev Mar-15 Contents iii

HART Device Interface Instruction Manual

[This page is intentionally left blank]

iv Contents Rev Mar-15

Chapter 1 – General Information

Chapter 1
General Information

Provides an overview of the purpose and physical
structure of the HART Device Interface (HDI).

Installation and Use

HDI.

This manual describes the ControlWave® Highway Addressable Remote
Transducer (HART®) Device Interface (HDI). This chapter provides an
overview of the HDI and its components.

In This Chapter

1.1 Scope of Manual................................................................................. 1-1

1.2 HDI Overview ..................................................................................... 1-1

1.3 Hardware ............................................................................................ 1-3

1.3.1 HDI Connectors ..................................................................... 1-4

1.3.2 HDI Status LEDs ................................................................... 1-6

1.3.3 HDI Circuitry .......................................................................... 1-6

1.4 Additional Technical Information ........................................................ 1-6

1.1 Scope of Manual

This manual contains the following chapters:

HART Device Interface Instruction Manual

1.2 HDI Overview

Chapter 2

Provides information on installing and using the

The ControlWave HART Device Interface (HDI) enables HART remote
devices or 3508 and 3808 transmitters to communicate with a Remote
Automation Solutions ControlWave PAC, ControlWave Micro, or
ControlWave Express RTU. The HDI supports both RS-232 and RS-485
interfaces. The interface to the field devices is provided by a jumper­selectable 249 ohm resistor in parallel with an AC coupled transformer.
To support the protocol (Data Link Layer), you must define a HART
function block and configure a host ControlWave communications port as
a custom port in HART mode. The ACCOL3 Client function block
supports RS-232-configured HDIs for communication with 3508/3808
transmitters. Each HDI can support up to 15 HART remote devices.

The HDI provides host/remote device communications, with the host
originating each transaction, and remote devices generating replies only
when prompted by the host. The HDI supports two hosts on a single link.
The “primary host” is the normal control-system host. When required,
you can define a hand-held communicator as the “secondary host” for
maintenance purposes. Primary and secondary hosts must use separate
addresses.

Rev Mar-15 General Information 1-1

HART Device Interface Instruction Manual

Figure 1. ControlWave HART Device Interface (HDI)

The HDI provides an RS-485/232 interface to a ControlWave RTU
communications port, using a two-wire (voltage sourced or current
sourced) connection to either a remote HART device or a 3508 or 3808
transmitter. Twisted-pair copper cable is used as the medium.

The HDI requires a 9-to-30 VDC bulk power supply. It supports RS-232
or RS-485 interfaces to the host ControlWave/RTU. For RS-232
communications, the HDI supports TXD, RXD, CTS, RTS, and CD
signals. For RS-485 communications, the HDI supports +TXD, -TXD,
+RXD, and -RXD signals. Interface to the field device is provided by a
jumper-selectable 249 ohm resistor in parallel with an AC coupled
transformer. During transmission, the FSK signal amplitude is between
400 to 600 mV with the average value of the FSK signal at 0 V. The HDI
receiver input requires a signal that must be in the range of 120 mV to 1.5
V (peak-to-peak). The HDI ignores FSK signals from the field devices
below 80 mV (peak-to-peak).

The HDI provides the following components and features:

 Selectable RS-232 or RS-485 interface to ControlWave RTUs
 Transformer-coupled communication interface to remote HART

devices

 Operates from external 9-to-30 VDC power source
 Applicable with both HART remote devices and 3508/3808

transmitters. Both RS-232 and RS-485 communication modes are
valid for HART remote devices. RS-232 mode is valid for both 3508s
and 3808 transmitters.

 Conforms to HART® FSK Physical Layer Specification.

1-2 General Information Rev Mar-15

1.3 Hardware

HART Device Interface Instruction Manual

The HDI is installed on a DIN rail mounting.

Figure 2. HDI mounted on a DIN rail

The HDI measures 5.56” long by 4.37” in high by 1.06” deep (see Figure

3).

Figure 3. HART Device Interface (with plastic enclosure)

Rev Mar-15 General Information 1-3

HART Device Interface Instruction Manual

A

A

B

C

In addition to eight selectable jumpers and four status LEDs, the HDI
provides three connectors.

1.3.1 HDI Connectors

The HDI provides the following connectors (see Figure 4):

 J1:a 9-pin D-type connector for the RS-232 interface (see Table 1)
 TB1: a 2-point terminal block for the RS-485 interface and input

power (see Table 2)

 TB2: a 2-point terminal block for HART remote device connections

(see Table 3)

J1; 9-pin D-type connector

B

TB1; 6-point terminal block

C

TB2; 2-point terminal block

Figure 4. HART Device Interface Circuit Board

1-4 General Information Rev Mar-15

HART Device Interface Instruction Manual

PIN #

RS-232 signal

Signal description

DCE I/O

PIN #

Name

Description

1

VIN +9 - +28 VDC

Input Power (+)

4

+RXD

+TX Data from ControlWave

PIN #

Field Connect

Table 1. RS-232 Interface Connector J1 Signal Identification

1 DCD Data Carrier Detect Output

2 /TXD Transmit Data NOT Input

3 /RXD Receive Data NOT Output

5 GND Ground -

6 CTS Clear to Send Output

7 RTS Request to Send Input

Table 2. Power & RS-485 Interface Connector TB1 Signal Identification

2 GND Power Ground (-)

3 - RXD - TX Data from ControlWave

5 - TXD - RX Data to ControlWave

6 +TXD +RX Data to ControlWave

Table 3. Remote Device Field Connector TB2 Signal Identification

1 Field Loop (no polarity)

2 Field Loop (no polarity)

Table 4. HDI Jumper Identification and Assignment

Jumper # Description Pos. 1-2 Pos. 2-3

W1 RS-232 Mode Disabled

W2 3508 Mode (10 mS ON Delay) Disabled Enabled

W3 RS-485 Rcvr. 120 ohm Terminator2 Enabled Disabled

W4 RS-485 Rcvr. Positive Bias2 Enabled Disabled

W5 RS-485 Rcvr. Negative Bias2 Enabled Disabled

W6 RS-485 Xmtr. 120 ohm Terminator2 Enabled Disabled

W7 Status LED Enable Enabled Disabled

W8 249 Ohm Loop Resistor Connected Open

N/A1

1 = W1 is a two-position jumper. When installed, it disables RS-232 and

enables RS-485 communications; when removed, it enables RS-232 and
disables RS-485 communications.

2 = Install on RS-485 End Node

Rev Mar-15 General Information 1-5

HART Device Interface Instruction Manual

Name

Form Number

Part Number

ControlWave HART Device Interface Product Data Sheet

CW:HDI

D301736X012

HART Master Protocol Manual

D40687

D301404X012

1.3.2 HDI Status LEDs

The HDI provides four status LEDs (located in the upper left corner of
the circuit board on Figure 4). You can disable the four LEDs by placing
jumper W7 in position 2-3.

 CR14 = /TXD (Transmit Data NOT)
 CR15 = /RXD (Receive Data NOT)
 CR16 = /DCD (Data Carrier Detect NOT)
 CR17 = /RTS (Request to Send NOT).

1.3.3 HDI Circuitry

The HDI has a built-in ±5V DC switching power supply that is fused and
operates from a bulk 9-to-30 VDC power supply. A blocking diode
protects the power supply circuitry from reversed input power conditions.

Independent RS-232 and RS-485 transceivers are jumper-selectable. A
120-ohm biasing resistor is jumper-selectable for the RS-485 transmit
lines. A 120-ohm terminator and biasing resistors are jumper-selectable
for the RS-485 receive lines.

When you configure the HDI to communicate with remote devices which
support the HART protocol, and the communication mode between the
HDI and the ControlWave device is RS-232. CTS NOT is asserted 100
microseconds after RTS NOT becomes valid. In the RS-485 mode, RTS
NOT is generated by a 1 to 0 transition of TXD. For 3508 applications in
RS-232 mode, a 10 millisecond RTS NOT to CTS NOT delay is selected
to emulate the existing TIB design. The added combination of RTS232
NOT and RTS485 NOT enables the FSK modem’s transmit circuitry,
enables the CMOS switch to the transformer, and disconnects the receive
signal to the FSK modem’s receiver.

The FSK modem operates at Bell 202 standards with a 460.8 KHz clock.

RS-232 and RS-485 signals are transorb protected from surge transients
and electrostatic discharge (ESD).

1.4 Additional Technical Information

Refer to the following technical documentation (available at
www.EmersonProcess.com/Remote) for additional and most-current
information:

Table 5. Additional Technical Information

1-6 General Information Rev Mar-15

Chapter 2 – Installation and Use

This chapter provides generalized guidelines for the installation and
operation of the HDI.

In This Chapter

2.1 Installation Requirements ................................................................... 2-1

2.1.1 Restrictions and Assumptions ............................................... 2-1

2.1.2 HART Remote Devices ......................................................... 2-2

2.2 Configuring a Single HDI .................................................................... 2-2

2.2.1 RS-485 Interface Communications ....................................... 2-2

2.2.2 RS-232 Interface Communications ....................................... 2-5

2.3 Configuring Multiple HDIs ................................................................... 2-7

2.3.1 RS-485 Interface Communications ....................................... 2-7

2.3.2 RS-232 Interface Communications ....................................... 2-9

2.1 Installation Requirements

This section details the installation requirements of the HART Device
Interface.

HART Device Interface Instruction Manual

Caution

To avoid circuit damage when working inside the unit, use
appropriate electrostatic discharge precautions (such as wearing a
grounded wrist strap).

When working on units located in a hazardous area (where explosive
gases may be present), make sure the area is in a non-hazardous
state before performing procedures. Performing these procedures in
a hazardous area could result in personal injury or property damage.

2.1.1 Restrictions and Assumptions

For multi-drop configurations, place the remote HART devices in a
“digital” operation mode, setting the loop current for the device at 4mA
or less. In receive mode, the host has an input impedance of 249 ohms.
Use the following equation to determine the maximum number of field
devices you can place in parallel with a 24V power supply:

Maximum number of remote devices =
{(24V - V(Field device) - [4mA x 249 x #(Field Devices)] - [4mA x
#(Field devices) x Wire Resistance] - 2Vloop} >0V

This calculation indicates that the HDI supports a maximum of ten
transmitters (which require a minimum of 12V to operate in a loop), when
the wire resistance is not included. If you intend to connect more than ten
transmitters in parallel, the power supply voltage must exceed 24V.

Note: You can connect a maximum of 15 transmitters in parallel.

Field devices with a maximum ID number of 15 cannot be mixed with
field devices with a maximum ID number of 224.

Rev Mar-15 Installation and Use 2-1

HART Device Interface Instruction Manual

2.1.2 HART Remote Devices

HDIs configured for RS-232 communications can meet the Carrier On
Delay value, but the Carrier Off Delay value may exceed the 5-bit time
requirement (but the delay will be less than 12 bit times). HART remote
devices are required to send a minimum of 5 preamble signals. The HDI’s
FSK modem can output receive data within 9 to 15 milliseconds after
completing the transmit cycle. At 1200 baud, one character time is 11 x

0.833 milliseconds or 10 milliseconds. The remote device starts to
transmits the preamble 10 milliseconds (one character time) after the end
of the last character sent from the host device. The total delay from the
end of the last character sent from the host to valid receive data is 25
milliseconds. Since there is a 1 character delay from the HDI, the receive
communications driver synchronizes on the third preamble at the latest.
The receive communications driver for the HART ACCOL3 function
block requires one preamble before the start of data.

For HDIs configured for RS-485 communications, the Carrier Off Delay
value is between 12 and 18 milliseconds (equivalent to 2 characters). The
FSK modem takes 9 to 15 milliseconds to assert Carrier Detect (CD) and
valid data. The total delay is 33 milliseconds. The remote device delays 9
millseconds (one character time). The difference is 33 - 9.2 = 23.8
milliseconds. This is about 2.6 characters. Two valid preambles will be
seen by the receive communications driver for the HART ACCOL3
function block, which is sufficient before the start of data.

2.2 Configuring a Single HDI

This section details how to configure a single HDI.

2.2.1 RS-485 Interface Communications

Note: An RS-485 cable cannot exceed 4000 feet in length.

Follow steps 1 through 4 to configure a single HDI for RS-485 or HART
interface operation.

1. Install the HDI in a suitable DIN rail mounted location. Connect the

power supply (9-to-30 VDC) to TB1 so that pin 1 accepts the +
Voltage and pin 2 is Ground.

2. Connect the HDI to the HART remote devices either as shown in

Figure 6 (for-to-20mA current sourced transmitters) or to a single
HART remote device (for a +12 to +45 VDC voltage sourced
transmitter) as shown in Figure 7.

3. Configure the selected ControlWave port for RS-485 operation (see

the HART Master Protocol Manual, Document # D4068) and connect
the selected port to TB1 of the HDI (see Table 2 for HDI - TB1
designations) (see Figure 5 for ControlWave D-Type RS-485
designations).

2-2 Installation and Use Rev Mar-15

HART Device Interface Instruction Manual

4. In ControlWave Designer, configure the HART function block in

your ControlWave project and download the project to the
ControlWave device. For information on HART function block
configuration, see the online help in ControlWave Designer.

Figure 5. ControlWave RS-485 D-Type Port Assignment

5. Set the HDI jumpers:

 Jumper W1 - RS-232 Mode - in position 1-2 (Disabled).
 Jumper W2 - In position 1-2 (Disabled).
 Jumper W3 - In position 1-2 (Enabled) places a 120 ohm

termination resistor across the RS-485 receive lines.

 Jumper W4 - RS-485 Receiver Positive Bias - position 1-2 =

Enabled.

 Jumper W5 - RS-485 Receiver Negative Bias - position 1-2 =

Enabled.

 Jumper W6 - In position 1-2 (Enabled) places a 120 ohm

termination resistor across the RS-485 transmit lines.

 Jumper W7 - In position 1-2 to Enable the Status LEDs, or

position 2-3 to disable them.

 Jumper W8 - In position 1-2 (Connected) - places a 249 ohm loop

resistor into the Power Supply loop (for 4-20 mA Current Loop
Transmitters). In position 2-3 for a voltage output slave device.

Rev Mar-15 Installation and Use 2-3

HART Device Interface Instruction Manual

Figure 6. HART Remote Transmitters with 4-20 mA Current Source Connected to ControlWave Using

an HDI in RS-485 Mode

Figure 7. HART Remote Transmitters with +12 to +45 VDC Voltage Source Connected to ControlWave

Using an HDI in RS-485 Mode

2-4 Installation and Use Rev Mar-15

HART Device Interface Instruction Manual

HART Device

CTS

CTS

GNDGND

RTS

RTS

DTR

DCD

TXD

RXD

RXD

TXD

ControlWave

1

9

6

9

6

5

1

5

2.2.2 RS-232 Interface Communications

Follow steps 1 through 4 to configure a single HDI assembly for RS-232
operation:

Note: An RS-232 cable cannot exceed 25 feet in length.

1. Install the HDI in a suitable DIN rail mounted location. Connect the

power supply (+9V to +30V DC) to TB1 as follows: Pin 1 = +
Voltage, Pin 2 = Ground.

2. Connect the HDI to the HART remote devices as shown in Figure 9

(for 4-20mA current sourced transmitters) or to a single HART
voltage output slave device as shown in Figure 10.

3. In the Flash Configuration utility, configure the ControlWave serial

port in question for the HART Protocol port type and connect the port
to J1 of the HDI board (see Table 1-1 for HDI - J1 designations). See
Figure 8 for ControlWave RS-232 cable designations. For
instructions on how to access the Flash Configuration utility, refer to
Chapter 5 of the OpenBSI Utilities (D5081) manual.

4. In ControlWave Designer, configure the HART function block in

your ControlWave project and download the project to the
ControlWave device. For information on HART function block
configuration, see the online help in ControlWave Designer.

Figure 8. ControlWave RS-232 Cable

Rev Mar-15 Installation and Use 2-5

HART Device Interface Instruction Manual

Figure 9. HART(Transmitters with 4-20 mA Current Source Connected to ControlWave using an HDI

in RS-232 Mode

5. Set the HDI jumpers: :

 Jumper W1 - RS-232 Mode - stored in position 1 or 2 (Enabled).

 Jumper W2 - In position 2-3 (Enabled) for 3508 Mode - 10

millisecond delay. In position 1-2 (Disabled) - for all except 3508
Mode.

 Jumper W3 - In position 2-3 = Disabled.

 Jumper W4 - In position 2-3 = Disabled.

 Jumper W5 - In position 2-3 = Disabled.

 Jumper W6 - In position 2-3 = Disabled.

 Jumper W7 - In position 1-2 to Enable the Status LEDs, or

position 2-3 to disable them.

 Jumper W8 - In position 1-2 (Connected) - places a 249 ohm loop

resistor into the Power Supply loop (for 4-20 mA Current Loop
Transmitters). In position 2-3 for a HART voltage output slave
device.

2-6 Installation and Use Rev Mar-15

HART Device Interface Instruction Manual

Figure 10. HART Transmitters (with +12 to +45 VDC Voltage Source Connected to ControlWave

Using an HDI in RS-232 Mode

2.3 Configuring Multiple HDIs

This section details how to configure multiple HDIs.

2.3.1 RS-485 Interface Communications

When using RS-485 communications, you can configure more than one
HDI in conjunction with a single ControlWave port to support multiple
groups of remote devices. (A single HDI can support up to 15 remote
devices.)

Note: In this situation, both the ControlWave port and HDI must be

configured for RS-485 communications.

Figure 11 shows an example of such a network. Depending on the type of
transmitter, configure the HDI either for current source or voltage source,
as described earlier.

Note: The maximum length of an RS-485 cable should not exceed 4000

feet.

Follow steps 1 through 5 to configure multiple HDIs for RS-485/HART
interface operation:

1. Install each HDI in a suitable DIN rail mounted location. Connect the

power supply (+9V to +30V DC) to TB1 as follows: Pin 1 = +
Voltage, Pin 2 = Ground.

2. Connect each HDI to the HART remote devices as shown in Figure 6

(for 4-20mA current sourced transmitters) or to a single HART slave
device as shown in Figure 7 (for a +12 to +45 VDC voltage output
transmitter).

Rev Mar-15 Installation and Use 2-7

HART Device Interface Instruction Manual

3. Configure the selected ControlWave port for RS-485 operation (see

the HART Master Protocol Manual, Document # D4068) and connect
the port in question to TB1 of the HDI board (see Table 2 for HDI ­TB1 designations) (see Figure 5 for ControlWave D-Type RS-485
designations).

Figure 11. Multiple HDI Assemblies Connected to Multiple Groups of HART Transmitters

4. Set the HDI board jumpers:

 Jumper W1 - Installed = RS-485 Mode Enabled.

 Jumper W2 - In position 1-2.

 Jumper W3 - In position 1-2 (Enabled) places a 120 ohm

termination resistor across the RS-485 receive lines. Jumper W3
should be placed in position 1-2 for the most distant HDI board
(End Node) and placed in position 2-3 (Disabled) for all other
nodes.

 Jumper W4 - RS-485 Receiver Positive Bias - position 1-2 =

Enabled, position 2-3 = Disabled. Jumper W4 should be placed in
position 1-2 for the most distant HDI board (End Node) and
placed in position 2-3 (Disabled) for all other nodes.

 Jumper W5 - RS-485 Receiver Negative Bias - position 1-2 =

Enabled, position 2-3 = Disabled. Jumper W5 should be placed in
position 1-2 for the most distant HDI board (End Node) and
placed in position 2-3 (Disabled) for all other nodes.

2-8 Installation and Use Rev Mar-15

HART Device Interface Instruction Manual

 Jumper W6 - In position 1-2 (Enabled) places a 120 ohm

termination resistor across the RS-485 transmit lines. Jumper W6
should be placed in position 1-2 for the most distant HDI board
(End Node) otherwise in position 2-3 (Disabled).

 Jumper W7 - In position 1-2 to Enable the Status LEDs, or in

position 2-3 to disable them.

 Jumper W8 - In position 1-2 (Connected) - places a 249 ohm loop

resistor into the Power Supply loop (for 4-20 mA Current Loop
Transmitters). In position 2-3 for a HART voltage output slave
device.

2.3.2 RS-232 Interface Communications

When using RS-232 communications, you can configure only one HDI in
conjunction with a single ControlWave port. Each ControlWave port can
support up to 15 HART transmitters or up to five 3508s or 3808s.

If a single ControlWave device must communicate with multiple groups,
wire the HDI associated with each group to a separate ControlWaveport,
(that is, a port dedicated to the selected HDI and group). Depending on
the type of transmitters, configure each HDI for either current source or
voltage source, as described earlier.

Rev Mar-15 Installation and Use 2-9

HART Device Interface Instruction Manual

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herein or their use or applicability. Remote Automation Solutions reserves the right to modify

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North American/Latin America:

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Asia-Pacific:

www.EmersonProcess.com/Remote

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Remote Automation Solutions
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T [phone] | F [phone]

www.EmersonProcess.com/Remote

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Remote Automation Solutions
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www.EmersonProcess.com/Remote

Emerson Process Management

Remote Automation Solutions
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Houston TX USA 77072
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www.EmersonProcess.com/Remote

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Remote Automation Solutions
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© 2015 Remote Automation Solutions, a business unit of Emerson Process Management.
All rights reserved.

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be liable for technical or editorial errors in this manual or omissions from this manual.
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