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RS-485 MicroLinK HM
RS-485 HART Protocol Modem
HART Device to Modbus Accumulator
DIN Rail Mount
Setup Software
Installation
Operation
& Specifications
Manual
The RS-485 MicroLink-HM 101-0035 is an RS-485 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. An external 5 to 30
volts DC power supply is required to power the unit.
When used as a HART protocol modem it provides the hardware interface between Highway Addressable Remote
Transducer devices (HART) and an RS-485 network. 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 RS-485 MicroLink-HM and HART devices is
always 1200 baud, odd parity.
RS-485 MicroLink-HM can be confi gured 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. Confi gura on is simple using
the included HM Confi gura 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 confi gura on cable is needed for setup as communica on is done
using the RS-485 port A and B. For confi gura on your PC will need an RS-485 port or a suitable converter, such as
the Microfl ex 101-0020 USB to RS-485 converter or the Microfl ex 101-0009 RS-232 to RS-485 converter.
620-0021 R2 © Microfl ex 2016-2021
101-0035
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Table of Contents
Related Manuals for Microflex MicroLink-HM 101-0035
Summary of Contents for Microflex MicroLink-HM 101-0035
- Page 1 & Specifications Manual The RS-485 MicroLink-HM 101-0035 is an RS-485 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.
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Page 2: Finding The Com Port Number
HART Protocol Modem The RS-485 MicroLink-HM ships confi gured to operate as a HART protocol modem. Connect the A and B terminals to an RS-485 port and provide a power supply. Power must be supplied by an external 5 to 30 volts DC power supply. Refer to the Power Supply sec on in this manual for details. -
Page 3: Power Supply
RS-485 MicroLink-HM Block Diagram 5-Pin Power Terminal Block Supply HART Status LED 1 - DC (+) HART Loop 2 - DC (-) Terminals 3 - GND RS-485 4 - RS-485 B HART Transceiver 5 - RS-485 A Modem Microcontroller Modbus Register Tables Power Supply The RS-485 MicroLink-HM is powered through an external power supply. -
Page 4: Home Screen
RS-485 MicroLink-HM HART - Modbus Accumulator In addition to being an RS-485 HART Protocol Modem, the MicroLink HM can be set to collect and store process variable information from up to 16 HART devices. HART devices are continuously polled and variable information is accumulated into a table of Modbus registers. - Page 5 HART Protocol Settings With unchecked, RS-485 MicroLink-HM will func on as a standard HART protocol modem and Fill Modbus Registers not poll HART devices to fi ll Modbus registers. In this mode HART packets are received and then retransmi ed at the HART 1200 baud, odd parity.
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Page 6: Modbus - Rtu Setup
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. -
Page 7: Hart Settings
Setup Registers The RS-485 MicroLink-HM confi gura on can be changed using the setup and confi gura 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. -
Page 8: Mode Settings
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 Serial Port Settings Bits 13,12 00 = No parity... - Page 9 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 RS-485 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.
- Page 10 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.
- Page 11 Modbus Register Map - Grouped by HART Device (1 of 3)
- Page 12 Modbus Register Map - Grouped by HART Device (2 of 3)
- Page 13 Modbus Register Map - Grouped by HART Device (3 of 3)
- Page 14 Modbus Register Map - Grouped by Variable Type...
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Page 15: Specifications
Specifications Enclosure Modbus RTU Polycarbonate plas c with Stainless Steel Cover Floa ng point byte order ........AD-CD or CD-AB (swapped) Weight ....................5 ounces Number of polled HART devices.............1 to 16 Moun ng ................35mm DIN Rail Clip Variables per polled HART device ........... (4) PV, SV, TV, FV Supported Modbus Commands ............ -
Page 16: Safety Considerations
(1) This device may not cause harmful interfer- ence, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by Microflex could void the user’s authority to oper- ate this equipment. Emissions EN55022: 1998... -
Page 17: Limited Warranty
RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF MICROFLEX SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER. MICROFLEX, LLC WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF PRODUCTS, OR INCIDENTAL OR CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE POSSIBILITIES THEREOF.
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