ICP DAS USA HRT-710 User manual

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 1
TM
HRT-710
User’s Manual
Version 1.24

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 2
Warranty
All products manufactured by ICP DAS are under warranty regarding
defective materials for a period of one year from the date of delivery to the
original purchaser.
Warning
ICP DAS assumes no liability for damages resulting from the use of this
product. ICP DAS reserves the right to change this manual at any time
without notice. The information furnished by ICP DAS is believed to be
accurate and reliable. However, no responsibility is assumed by ICP DAS for
its use, or for any infringements of patents or other right of third parties
resulting from its use.
Copyright
Copyright 2012 by ICP DAS. All rights are reserved.
Trademark
The names used for identification only may be registered trademarks of
their respective companies.

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 3
Table of Contents
1. Introduction 5
1.1 Features 5
1.2 Modbus Function Code Support 6
1.3Specifications 6
2. Hardware 8
2.1 Block Diagram 8
2.2 Pin Assignment 8
2.3 Wiring 9
2.4LED indicator 13
2.5DIP Switch 14
2.6Jumper 15
3. HART Introduction 16
3.1 Analog and Digital signal 16
3.2 Network topology 17
3.3 HART Frame 18
4. Modbus Communication 22
4.1 Module Execution Process 22
4.3 Modbus / HART Mapping Table 22
4.4 Diagnostic Messages 28
4.5 Through Mode 28
4.6Data Exchange Example 29
5. HG_Tool Application 33
5.1 Install .NET Compact Framework 33
5.2 Install HG_Tool 34
5.3 HG_Tool Function 37
5.4 Establish connection with HRT-710 60
6. Troubleshooting 63
7. FAQ 64
Q01 : How to add HART devices to HRT-710 ? 64
Q02 : How to make sure that HRT-710 gets the HART device data correctly ? 67
Q03 : How to map HART device CMD(3) data directly to SCADA or HMI ? 70
Q04 : How to update the firmware of HRT-710 ? 78
Q05 : How to read HART device CMD1 data with standard format by Modbus ?80
Q06 : How to read HART device CMD 3 data with standard format by Modbus ?
83
Q07 : How to know the connection status between HRT-710 and HART devices ?
85
Q08 : How to integrate Active and Passive HART devices in multi-drop network ?
87
Q09 : How to integrate multiple HRT-710 modules in the same project ? 88
Q10 : How to integrate HART comm. device with RS-232 hardware interface ? 90
Q11 : How to add the HART Device-Specific command to HRT-710 ? 90
Q12 : How to set HART device address by HRT-710 utility ? 93

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 4
8. Dimensions 96
Appendix A: HART Command 98
Appendix B: Command Format 103
Appendix C: Version History 104

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 5
1. Introduction
Modbus and HART are two kinds of famous protocols and used wildly in
the fields of factory and process automation. The HRT-710 module is a
Modbus to HART gateway. By using this module, users can integrate their
HART devices into Modbus network easily. The below figure 1 shows an
application example for the HRT-710 module.
Figure 1:Application architecture of the HRT-710 module
The main features and specification of HRT-710 are described as below :
1.1 Features
●Support HART Short/Long frame.
●Support HART Burst mode.
●Allow two HART Masters.
●Support Modbus RTU and ASCII format.
●Support Modbus Slave / HART Master mode.
●Support firmware update via Com Port. (FW_v1.2 and HW_v1.2)
●Support on-line replacement of HART devices. (FW_v1.5)
●Support acquire Long Frame Address automatically (FW_v1.5)
●Isolated COM 1:RS-232/422/485.
●Provide LED indicators.
●Built-in Watchdog.
●DIN-Rail or Wall Mounting.

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 6
1.2 Modbus Function Code Support
HRT-710 supports the following Modbus Function Code commands.
[ Table 1: Modbus Function Codes ]
FC
Description
01
Read multiple coils status
02
Read multiple input discretes
03
Read multiple Holding registers
04
Read multiple input registers
05
Write single coil
06
Write single register
15
Force multiple coils
16
Write multiple registers
1.3Specifications
[ UART Spec. ]
●COM1:RS-232(3 wire) / RS-422 / RS-485
●Connector:9-pin screwed terminal block
●Baud Rate:1200 ~ 115200 bps
●Data Format:
[1] data bits :7/8
[2] parity :None/Odd/Even
[3] stop bit :1/2
[ HART Spec. ]
●Channel number:1
●Connector:2-pin screwed terminal block
●Operates as a HART Master station and supports all HART commands
●Frame:Short or Long
●Network:Point to Point or Multi-drop
●Max. 15 HART modules
●Max. 100 user commands and 32 default commands
[ Power Requirement ]
●Unregulated +10 ~ +30 VDC
●Power reverse protection, Over-Voltage brown-out protection
●Power consumption:1 W

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 7
[ Module Spec. ]
●Dimensions: 72 mm x 121 mm x 35 mm (W x L x H)
●Operating temperature:-25 ~ 75 ºC
●Storage temperature:-30 ~ 85 ºC
●Humidity:5 ~ 95% RH, non-condensing
●LED Status Indicators (Table 2)
[ Table 2: LED status indicator ]
PWR LED
Show the power state
ERR LED
Show error state
RUN LED
Show HART communication state

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 8
2. Hardware
2.1 Block Diagram
Figure 2:Block diagram of HRT-710
2.2 Pin Assignment
Figure 3: Pin assignment of HRT-710

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 9
[ Table 3: Screw terminal block ]
Pin
Name
Description
1
HART+
Positive of HART
2
HART-
Negative of HART
3
-
N/A
4
-
N/A
5
-
N/A
6
-
N/A
7
-
N/A
8
-
N/A
9
+VS
V+ of Power Supply(+10 ~ +30 VDC)
10
GND
GND of Power Supply
11
RXD
Receive Data of RS-232
12
TXD
Transmit Data of RS-232
13
GND
GND of RS-232
14
RX+
Receive Data+ of RS-422
15
RX-
Receive Data- of RS-422
16
TX+
Transmit Data+ of RS-422
17
TX-
Transmit Data- of RS-422
18
-
N/A
19
D+
Data+ of RS-485
20
D-
Data- of RS-485
2.3 Wiring
It is recommended to use only one serial port interface (RS232,
RS422 or RS485) of the HRT-710 module at the same time. The following
section describes the necessary steps to connect one of the three COM
port types to a Modbus network.
2.3.1 RS-232 Wiring
The RS-232 port of the HRT-710 has only three pins. The wiring of
the RS-232 device with the RS-232 port of the HRT-710 is shown as
Figure 4.

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 10
Figure 4:RS-232 wiring diagram
2.3.2 RS-485 Wiring
The RS-485 wiring is shown as Figure 5.
Figure 5:RS-485 wiring diagram
2.3.3RS-422 Wiring
The RS-422 wiring is shown as Figure 6.

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 11
Figure 6:RS-422 wiring diagram
2.3.4 HART Wiring
The HART bus wiring is divided into the below two types:
(1) ―Loop Power Source‖
(2) ―External Power Source‖
Figure 7:Example1—Loop Power Source with built-in resistor of HRT-710

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 12
Figure 8:Example2—Loop Power Source with external resistor
Figure 9:Example3—Loop Power Source with external resistor

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 13
Figure 10:Example4—External Power Source with external resistor
2.4LED indicator
The HRT-710 provides three LEDs to indicate the module status. The
descriptions are as shown in table 4 and Figure 11.
[ Table 4: LED status description ]
LED
Name
Status
Description
PWR
on
Power Supply OK.
off
Power Supply Failed.
ERR
flash
Comm. Error.
off
No Error.
RUN
flash
Flash per second:module in initial mode.
Flash per half second:module received
the burst frame from HART device.
on
Module in normal operation.
off
Firmware has not been loaded yet.

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 14
Figure 11:LED indicator
2.5DIP Switch
There is a DIP Switch on the backplane of the HRT-710 module, as
shown in Figure 12. In the normal situation, it needs to set the DIP Switch to
the ―Normal‖ position. If the user forgets the setting of HRT-710, the user can
set the DIP Switch to the ―Default‖ position; the HRT-710 module will be
started at default settings.
Figure 12:DIP Switch of the HRT-710
The following is the default value of module ―Default‖mode.
[ System Defalut Value ]

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 15
HART command interval:1000 ms
HART command timeout value:1000 ms
Auto. Polling:Enable
Retry count:3
[ Modbus Default Value ]
Baud rate:115200 bps
Date bits:8 bits
Stop bits:1 bit
Parity:None
Net ID:1
Protocol:Modbus RTU Slave
Swap mode:None
2.6Jumper
There is a Jumper (JP4) in the HRT-710 module shown as Figure 13. The
jumper can provide HART bus with 250 Ω (1/4 W) resistor. When the pin 1&2
of JP4 is closed, the resistor will connect to HART bus. When the pin 2&3 of
JP4 is closed or JP4 without jumper connected, it will disconnect the resistor
from HART bus. By default, the pin1&2 of JP4 is closed. Please refer to
section 2.3.4 - HART connection for detail.
Figure 13:Jumper of the HRT-710

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 16
3. HART Introduction
3.1 Analog and Digital signal
The HART communication protocol is based on the Bell 202 telephone
communication standard and operates using the frequency shift keying (FSK,
Figure 14) principle. The digital signal is made up of two frequencies - 1,200
Hz and 2,200 Hz representing bits 1 and 0, respectively. Sine waves of these
two frequencies are superimposed on the direct current (dc) analog signal
cables to provide simultaneous analog and digital communications (Figure 15).
Figure 14:FSK signal
Figure 15:Analog and digital signals

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 17
3.2 Network topology
HART bus can operate in one of these two network configurations—point
to point or multi-drop.
1. Point to Point Mode :
In point to point mode, the analog signal is used to communicate one
process variable and the digital signal gives access to secondary variables
and other data that can be used for operations, commissioning, maintenance
and diagnostic purposes. Only one HART slave device can exist in HART bus
and the polling address must be zero.
Figure 16:―Point to Point‖topology
2. Multi-drop Mode :
In multi-drop mode, all process values are transmitted digitally. The
polling address of all field devices must be bigger than 0 and between 1 ~
15. The current through each device is fixed to a minimum value (typically
4 mA). The maximum HART device number in HART bus is up to 15.
[ Note ]
1. The built-in resistor in HRT-710 is 250 Ohm with 1/4W. Therefore, HRT-
710 supports to connect the maximum 7 HART devices simultaneously. If
the HART devices in multi-drop mode are more than 7, then users need to
disconnect the built-in resistor in HRT-710 (prevent to burn down) and use
the external 250 Ohm resistor with 1W.

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 18
Figure 17:―Multi-drop‖topology
3.3 HART Frame
The HART frame format is shown as below:
Figure 18:HART frame format
3.3.1 Preamble
All frames transmitted by HART master or slave devices are
preceded by a specified number of "0xFF" characters and they are
called the preamble. The number of preamble can’t be less than 5 and
more than 20.

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 19
3.3.2 Delimiter
This data can indicate the frame is long or short frame and the
frame is master frame, slave frame or burst frame.
3.3.3 Address
If the HART frame is short frame, the address field is only one byte.
If it is long frame, the address field is 5 bytes and include manufacturer
ID, device type and device ID.
3.3.4 Command
The HART command set includes three classes shown as below.
(1) Universal Command
(2) Common-Practice Command
(3) Device-Specific Command
Command Number Command Class
0 Universal
‧‧
‧‧
‧‧
30 Universal
31 Reserved
-------------------------------------------------------
32 Common Practice
‧‧
‧‧
‧‧
127 Reserved
-------------------------------------------------------
128 Transmitters-Specific
‧‧
‧‧
‧‧
253 Transmitters-Specific
-------------------------------------------------------
254 Reserved
255 Reserved
About the often used HART command, please refer to ―Appendix A:
HART command‖.

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 20
3.3.5 Byte Count
It is the number of bytes between it and the check byte the end of
the HART frame.
3.3.6 Response Codes
It includes two bytes of status. These bytes convey three types of
information:Communication errors, Command response problems and
Field device status. They are shown as below.
[ First Byte ]
bit 7:1 (communication error)
bit 6:Parity error
bit 5:Overrun error
bit 4:Framing error
bit 3:Checksum error
bit 2:0(reserved)
bit 1:Rx buffer overflow
bit 0:Overflow (undefined)
[ bit 7=0 (Comm. OK) ; Bit 0~6: as an integer, not bit-mapped ]
0:No command-specific error
1:(undefined)
2:Invalid selection
3:Passed parameter too large
4:Passed parameter too small
5:Too few data bytes received
6:Device-specific command error (rarely used)
7:In write-protect mode
8-15:Multiple meanings
16:Access restricted
28:Multiple meanings
32:Device is busy
64:Command not implemented
[ Second Byte - Field device status ]
bit 7:Field device malfunction
bit 6:Configuration changed
bit 5:Cold start
bit 4:More status available
bit 3:Analog output current fixed
bit 2: Analog output saturated
bit 1:Non-primary variable out of limits