Microlink 101-0029 User manual

Setup Software
Installation
Operation
& Specifications
Manual
620-0018 R2 © Microflex 2016, 2021
101-0029
MicroLinK HM
RS-232 HART Protocol Modem
HART Device to Modbus Accumulator
DIN Rail Mount
The MicroLink-HM 101-0029 is an RS-232 to HART® protocol modem with managed HART master ming to funcon
as either a primary or secondary HART master - eliminang the need for external CD monitoring and RTS control.
It can also be used as a HART to Modbus Concentrator polling up to 16 HART devices. Power can be taken from the
serial port DTR handshake line or an external 5 to 30 volts DC power supply.
When used as a HART protocol modem it provides the hardware interface between Highway Addressable Remote
Transducer devices (HART) and a computer with an RS-232 port. Unlike many HART modems, communicaons
direcon control is handled internally so there is no need to handle tricky request-to-send (RTS) handshake ming,
greatly simplifying soware development and enabling the MicroLink-HM modem to be compable with common
USB to RS-232 serial converters. Serial port baud rates can be set from 1200 to 57,600 and parity can be odd, even,
or none. HART protocol communicaons between the MicroLink-HM and HART devices is always 1200 baud, odd
parity.
MicroLink-HM can be configured to poll up to 16 HART devices and save the HART device data into modbus
registers. Modbus RTU commands can then be used to read the HART device data. Configuraon is simple
using the included MicroLink-HM Configuraon soware. Sengs are saved in modus registers so modbus RTU
commands can also be used to edit the MicroLink sengs. No special configuraon cable is needed for setup as
communicaons is done using the MicroLink-HM serial port.
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Finding the COM Port Number
You will need to know the COM port number the MicroLink-HM modem is connected to. To see a list of COM ports
installed on your PC, open the Device Manager and select View > Devices by Type. Expand Ports (COM & LPT) to see the
list of available COM ports. MicroLink-HM is compable with USB to serial converters as well as RS-232 serial ports.
HART Protocol Modem
MicroLink-HM ships configured to operate as a HART protocol modem. No addional drivers or external power sources
are needed. Simply connect the 9-pin D-sub connector to a standard RS-232 port. Power can also be supplied by the
DTR handshake line or by an external supply. Refer to the Power Supply secon in this manual for details.
MicroLink-HM is compable with most HART configuraon and test soware. Included on the CD is the Microflex HART
Host applicaon.
To funcon as a HART protocol modem the serial port is typically set to 1200 baud, odd parity. Most HART soware
will require this seng. It is possible to set the serial port to other baud rates and parity sengs. This is helpful when
connecng the MicroLink-HM to a device that does not offer 1200 baud. In this case MicroLink-HM will receive the
HART command at the higher baud rate then transmit the HART data at 1200 baud, odd parity onto the HART loop. The
1200 baud, odd parity HART reply packet is received by the MicroLink-HM modem and then transmied back at the
higher baud rate.
If MicroLink-HM is configured to Fill Modbus Registers and the serial port detects a HART packet on the RS-232 port,
MicroLink-HM will temporarily switch to HART mode and stop polling devices. HART protocol packets always begin
with the hex FF preamble character. Modbus packets begin with the slave address. If no HART commands are received
over the serial port, MicroLink-HM will return to polling and filling modbus registers aer 30 seconds. Also, if a modbus
command is received MicroLink will exit HART mode and return to polling and filling modbus registers.
Connecting to the HART Loop
Connect the two screw terminals to the HART device
or HART loop. Microlink provides electrical isolaon
between the HART loop and the serial port so it is safe
to ignore grounding and polarity issues when making
the HART connecons. The HART protocol requires a
loop resistance of 230 to 600 ohms, typically 250 ohms.
Refer to your equipment installaon instrucons for
details on connecng a HART master or configuraon
device to the loop.
HART Status LED Operation
The LED on the front panel of the MicroLink-HM is used
to monitor HART communicaons acvity. The LED
will be green while transming or sending a packet to
your HART protocol devices, and will be red when HART
protocol replies are received.
LOOP
POWER
SUPPLY HART
DEVICE
250Ω
LOOP
POWER
SUPPLY HART
DEVICE
250Ω
Figure 1. Connecting HART modem to device loop.
Connecting across the loop resistor.
Connecting across the HART device.
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Mounting
The DIN rail mounng clip is compable with widely used 35mm EN 50022 rails. It can be snap mounted and removed
from the mounng rail without tools for quick installaon and servicing.
Power Supply
The MicroLink-HM is powered through the 9-pin RS-232
connector using the RS-232 Data-Terminal-Ready (DTR)
handshake line - pin 4. When using DTR for power, no external
power supply is required.
An external DC power supply in the 5 to 30Vdc range can also
be used. Connect the posive side to DTR (pin 4) and negave
to Ground (pin 5). Maximum supply current ranges from 2mA
at 30 volts to 10.5mA at 5 volts. The RS-232 transmit and
receive will share the ground (pin 5) with the power supply
ground. If external power is used then DTR should not be
connected to the mang RS-232 port. Only transmit, receive,
and ground are required for communicaons.
5 - GROUND
2 - RX ←
3 - TX →
4 - DTR (5-30Vdc)
Figure 2. DB-9 Wiring Diagram
HART Status LED
Power
Supply
RS-232
Driver/Rcvr HART
Modem
Microcontroller
Modbus Register
Tables
TX
RX
CD
RTS
1
2 - RX
3 - TX
4 - DTR
5 - GND
6
7
8
9
9-Pin RS-232
D-Sub Connector HART Loop
Terminals
HART Status LED
MicroLink-HM Block Diagram
RS-232 Cable Schematic
The RS-232 extension cable connecng the
MicroLink-HM to the RS-232 serial port requires
only 4 wires. If external power is used then only
transmit, receive, and ground are needed on the
RS-232 port side.
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Setting COM Port
The MicroLink-HM soware must be set to use the same COM
port that the modem is connected to. From the top menu
select Setup>Com Port. Choose the COM port number from the
list of available ports. Aer choosing, click Connect to aempt
to connect using the sengs selected. The connecon process
will first try the last good baud rate and parity sengs. If it
fails to connect the process will work through other sengs
to try to find the
correct MicroLink-
HM sengs for
communicaons.
If it sll does not
connect - verify
that you have
chosen the correct
COM number,
connecons are
correct, and power
is on before trying
again.
MicroLink-HM HART - Modbus Accumulator
In addion to being an RS-232 HART Protocol Modem, the MicroLink HM can be set to collect and store process
variable informaon from up to 16 HART devices. HART devices are connuously polled and variable informaon is
accumulated into a table of Modbus registers. Using the MicroLink-HM serial port, the registers can be read using
Modbus RTU command 3. Variable data can be read as 16 bit integers or 32 bit floang point. Up to 4 variables for each
polled HART device.
In the accumulate mode, MicroLink-HM will funcon as a HART master (primary or secondary) polling devices and
storing variable values into registers. No addional HART soware is needed. The HART loop may contain a single
device or up to 16 devices. When more than one device is in the loop each HART device must have a unique HART
polling address. The address for each device is set before wiring the device into the mul-drop loop. The device polling
address for each device is stored in the MicroLink-HM using the MicroLink-HM configuraon soware.
Modbus slave address, baud rate, parity, and other sengs are set using the MicroLink-HM configuraon soware.
Configuraon is done using the same RS-232 port that Modbus will use so no addional setup cable is required. Aer
the configuraon is completed, the RS-232 port is connected to the Modbus controller. At power on the MicroLink-HM
will begin polling and accumulang values. Modbus RTU command 3 is used to read the accumulated values.
MicroLink HM Installation - Windows
The MicroLink-HM configuraon soware is included on a CD with the unit. Simply insert the CD and follow the on-
screen prompts to install the soware. If AutoRun is not configured to run the CD file when the CD is inserted you will
need to navigate to the SetupHM.exe file on the CD and double-click the file name to run it.
Aer Installaon the MicroLink-HM icon will be added to your system.
Don’t have a CD drive?
Download the HART Protocol CD image from www.microflx.com/pages/support
Home Screen
The home screen displays a summary of the MicroLink-HM status, HART modem sengs, and Modbus sengs. Use the
top drop-down menus to configure the MicroLink-HM modem.
Figure 3. COM Port List. Figure 4. MicroLink-HM Setup home screen.
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Polling HART Devices - Fill Modbus Registers
To enable Modbus register accumulaon, check the Fill Modbus Registers opon. The Hart Protocol Sengs window will
expand to show the Polled Devices sengs.
Retries
If a HART devices is polled but does not respond, or errors are detected, MicroLink-HM can retry up to 3 mes before
indicang a bad device. If a device is not responding the Modbus values are filled with Hart Device Failed register
values - setup is done in the Modbus configuraon secon.
Polled Devices
In the example screen shot (Figure 5), MicroLink-HM is set to poll one HART device using polling address 0 and will retry
1 me before reporng a communicaons error. The Device Variables (Modbus Register Values) box on the right displays
the register values for the acve polled device. Click Add Device to add a polled HART device. Be sure to set the Polling
Address for each device. Each device must have a unique HART polling address. Polling addresses must be setup for
each HART device
before it can be
connected to a
mul-drop HART
loop and can be set
from 1 to 63.
Address 0 can only
be used when one
device is in the
HART loop.
Polling addresses
16-63 should only
be used with HART
revisions 6 and
higher. For HART
3-5 use addresses
1-15 for multi-drop
systems.
HART Protocol Settings
With Fill Modbus Registers unchecked, MicroLink-HM will funcon as a standard HART protocol modem and not poll
HART devices to fill Modbus registers. In this mode HART packets are received and then retransmied at the HART
1200 baud, odd parity. Received reply packets are retransmied at
the selected baud rate. RTS ming and carrier detect are handled
internally by the MicroLink-HM allowing RS-232 communicaons at
higher than 1200 baud. HART loop data is handled at the standard
HART protocol 1200 baud, odd parity but because MicroLink-HM
buffers the data the RS-232 port can be set for higher rates as well
as odd, even, or no parity. Port sengs can be set in the Modbus
Sengs secon.
Since MicroLink-HM manages network timing it needs to be con-
figured for either a primary or secondary master. Portable configu-
ration modems are typically set to be secondary masters.
Figure 5. HART protocol sengs dialog when filling modbus registers is enabled.
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Modbus - RTU Setup
Modbus-RTU Sengs can be accessed and changed by clicking Setup>Modbus from the top drop-down menu.
Modbus Address
Each device on a Modbus network must have a unique address.
Set this to match the address that your Modbus master will use
to communicate with the MicroLink-HM. The Modbus address
can be set to any value from 1 to 247. The MicroLink-HM
configuraon soware will discover this address as part of the
connecon process.
Baud Rate & Parity
The MicroLink-HM baud rate and parity must be set to the
same sengs as your Modbus master. If you are using the
MicroLink-HM as a HART protocol modem these should be set
to 1200 baud, odd parity. Click Use HART Protocol Settings to
set the correct values for a HART modem.
Holding Registers Map
Accumulated data is stored in Modbus registers that are
grouped or mapped by HART device or by variable type. Choose
the register map that best fits your applicaon. Register maps
can be viewed using the MicroLink-HM configuraon soware.
From the top drop-down menu select View -> Modbus Registers
Maps (Figure 7.)
Decimal Places
When device data is stored into a 16 bit signed Modbus register the value can range from -32768 to 32767. To allow
the 16 bit integer to represent a smaller number and include fraconal informaon, the number of decimal places is
stored in a separate Modbus register and applied later. The number of decimal places can be set from 0 to 5. Decimal
places can be set for each variable. The Device Variables box shows the effect of the decimal place seng. Decimal place
sengs are not used for the Modus floang point register values.
Figure 6. Modbus sengs dialog.
Figure 7. Menu for viewing modbus register maps.
Floating Point Byte Order
Modbus 32 bit floang point numbers are stored in two
consecuve 16 bit registers using the IEEE-754 standard
big endian byte order (AB-CD). The most significant byte
(A) is sent first. For compability with some modbus
systems you may need to use the word swapped format
(CD-AB).
HART Device Failed Register Value
If a polled HART device fails to respond, or has
communicaons errors it will retry for the number of
mes set in the HART Protocol Sengs dialog. If aer
retries the device does not respond you can choose to
hold the last value, set to a preset number, or set to
the IEEE-754 NaN floang point value. This can help the
modbus master determine when a HART device is no
longer responding.
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Setup Registers
The MicroLink-HM configuraon can be changed using the setup and configuraon soware or by wring to modbus
registers using modbus-RTU commands 6 or 16. Command 6 writes to a single register and command 16 writes to a
range of modbus registers. The configuraon register values are saved in nonvolale memory and are not lost when
MicroLink-HM power is removed.
HART Settings
Bits 9, 8 HART failed mode 0 = Hold last value after HART retries
1 = Preset to register 772 value after HART retries
2 = Preset to IEEE-754 NaN (0 for integers)
Bits 7, 6 HART poll retries Sets number of HART device poll retries from 1 to 3.
After poll retries, the HART failed mode value is stored in the variable register.
Bits 3 - 0 Number of polled devices -1 Range is 0 to 15. 0 = 1 polled device. 15 = 16 polled devices.
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Serial Port Settings
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Bits 13, 12
00 = No parity
01 = Even
10 = Odd
Mode Settings
Bit 9 - Floating point value byte order 0 = Standard byte order (AB - CD)
1 = Swapped words (CD - AB)
Bit 8 - Modbus device map 0 = Map register data by HART device
1 = Map register data by variable type
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Bits 11 - 8
1 = 1200 Baud
2 = 2400
3 = 4800
4 = 9600
5 = 14400
6 = 19200
7 = 38400
8 = 57600
9 = 115200
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ϭϭ ϳϯϬ WƌĞĂŵďůĞƐDĂŶŽĚĞŽƌdLJƉĞ
ϳϯϭ ĞǀŝĐĞdLJƉĞ/ϭ
ϳϯϮ /Ϯ/ϯ
ϭϮ ϳϯϯ WƌĞĂŵďůĞƐDĂŶŽĚĞŽƌdLJƉĞ
ϳϯϰ ĞǀŝĐĞdLJƉĞ/ϭ
ϳϯϱ /Ϯ/ϯ
ϭϯ ϳϯϲ WƌĞĂŵďůĞƐDĂŶŽĚĞŽƌdLJƉĞ
ϳϯϳ ĞǀŝĐĞdLJƉĞ/ϭ
ϳϯϴ /Ϯ/ϯ
ϭϰ ϳϯϵ WƌĞĂŵďůĞƐDĂŶŽĚĞŽƌdLJƉĞ
ϳϰϬ ĞǀŝĐĞdLJƉĞ/ϭ
ϳϰϭ /Ϯ/ϯ
ϭϱ ϳϰϮ WƌĞĂŵďůĞƐDĂŶŽĚĞŽƌdLJƉĞ
ϳϰϯ ĞǀŝĐĞdLJƉĞ/ϭ
ϳϰϰ /Ϯ/ϯ
ϭϲ ϳϰϱ WƌĞĂŵďůĞƐDĂŶŽĚĞŽƌdLJƉĞ
ϳϰϲ ĞǀŝĐĞdLJƉĞ/ϭ
ϳϰϳ /Ϯ/ϯ
Polled HART Devices Long Address Table
Device ID informaon is read from each polled device using the devices polling address and HART command 0. The
reply to command 0 for each polled device is used to populate the long address table. When MicroLink-HM needs to
poll for the device variables, using HART command 3, this table holds the informaon needed to build the 5-byte long
address. Table values can be read using Modbus-RTU command 3. Only the polled device you have configured will
contain valid informaon. The table is updated aer each valid device poll.
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DŽĚďƵƐ ,ZdĞǀŝĐĞWŽůůŝŶŐĚĚƌĞƐƐ
ZĞŐŝƐƚĞƌ ;ŚŝŐŚďLJƚĞůŽǁďLJƚĞͿ
ϳϰϴ ĞǀŝĐĞϭĞǀŝĐĞϮ
ϳϰϵ ĞǀŝĐĞϯĞǀŝĐĞϰ
ϳϱϬ ĞǀŝĐĞϱĞǀŝĐĞϲ
ϳϱϭ ĞǀŝĐĞϳĞǀŝĐĞϴ
ϳϱϮ ĞǀŝĐĞϵĞǀŝĐĞϭϬ
ϳϱϯ ĞǀŝĐĞϭϭĞǀŝĐĞϭϮ
ϳϱϰ ĞǀŝĐĞϭϯĞǀŝĐĞϭϰ
ϳϱϱ ĞǀŝĐĞϭϱĞǀŝĐĞϭϲ
HART Device Polling Address Table
The polling address for each polled device is stored in this table. Two polling addresses in each 16 bit register. If
address 0 is used then only one device can be polled and Device 1 should be set to 0. Address 0 is not valid in mul-
drop systems. For HART devices with HART revision 3 through 5 you should use polling addresses 1 - 15. Addresses
16-63 require HART revision 6 or higher.
,Zd DŽĚďƵƐ EƵŵďĞƌŽĨĞĐŝŵĂůWůĂĐĞƐ
ĞǀŝĐĞ ZĞŐŝƐƚĞƌ ĞƐĐƌŝƉƚŝŽŶ;ŚŝŐŚďLJƚĞůŽǁďLJƚĞͿ
ϭ ϳϱϲ WsͲ^dsͲ&s
Ϯ ϳϱϳ WsͲ^dsͲ&s
ϯ ϳϱϴ WsͲ^dsͲ&s
ϰ ϳϱϵ WsͲ^dsͲ&s
ϱ ϳϲϬ WsͲ^dsͲ&s
ϲ ϳϲϭ WsͲ^dsͲ&s
ϳ ϳϲϮ WsͲ^dsͲ&s
ϴ ϳϲϯ WsͲ^dsͲ&s
ϵ ϳϲϰ WsͲ^dsͲ&s
ϭϬ ϳϲϱ WsͲ^dsͲ&s
ϭϭ ϳϲϲ WsͲ^dsͲ&s
ϭϮ ϳϲϳ WsͲ^dsͲ&s
ϭϯ ϳϲϴ WsͲ^dsͲ&s
ϭϰ ϳϲϵ WsͲ^dsͲ&s
ϭϱ ϳϳϬ WsͲ^dsͲ&s
ϭϲ ϳϳϭ WsͲ^dsͲ&s
Number of Decimal Places Table
When storing the HART variable data in 16-bit modbus registers the maximum range is -32768 to 32767. To increase the
possible resoluon, the variable value read from the HART device is decimal posion adjusted before being saved in the
16-bit register. When the register is read, the value must be corrected by the number of decimal placed to produce the
correct value. The number of decimal places for each variable occupies 4-bits in the register with one register for each
polled device.
Decimals Variable Range
0 -32768 to 32767
1 -3276.8 to 3276.7
2 -327.68 to 327.67
3 -32.768 to 32.767
4 -3.2768 to 3.2767
5 -0.32768 to 0.32767
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