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Microflex MicroLink-HM 101-0029 Installation & Operation Manual

Rs-232 hart protocol modem hart device to modbus accumulator din rail mount
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101-0029
MicroLinK HM
RS-232 HART Protocol Modem
HART Device to Modbus Accumulator
DIN Rail Mount
Setup Software
Installation
Operation
& Specifications
Manual
The MicroLink-HM 101-0029 is an RS-232 to HART® protocol modem with managed HART master timing to
function as either a primary or secondary HART master - eliminating 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, communications
direction control is handled internally so there is no need to handle tricky request-to-send (RTS) handshake timing,
greatly simplifying software development and enabling the MicroLink-HM modem to be compatible 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 communications between the MicroLink-HM and HART devices is always 1200 baud, odd
parity.
MicroLink-HM can be confi gured to poll up to 16 HART devices and save the HART device data into modbus reg-
isters. Modbus RTU commands can then be used to read the HART device data. Confi guration is simple using the
included MicroLink-HM Confi guration software. Settings are saved in modus registers so modbus RTU commands
can also be used to edit the MicroLink settings. No special confi guration cable is needed for setup as communica-
tions is done using the MicroLink-HM serial port.
620-0018 R1.1 © Microfl ex 2016, 2017

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Summary of Contents for Microflex MicroLink-HM 101-0029

  • Page 1 & Specifications Manual The MicroLink-HM 101-0029 is an RS-232 to HART® protocol modem with managed HART master timing to function as either a primary or secondary HART master - eliminating 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.

  • Page 2: Finding The Com Port Number

    HART Protocol Modem MicroLink-HM ships confi gured to operate as a HART protocol modem. No additional drivers or external power sourc- es are needed. Simply connect the 9-pin D-sub connector to a standard RS-232 port. Power can be supplied by the DTR handshake line or by an external supply.

  • Page 3: Power Supply

    MicroLink-HM Block Diagram 9-Pin RS-232 HART Status LED HART Loop D-Sub Connector Terminals RS-232 2 - RX HART 3 - TX Driver/Rcvr Modem Microcontroller 4 - DTR 5 - GND Power Supply Modbus Register Tables 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.

  • Page 4: Home Screen

    MicroLink-HM HART - Modbus Accumulator In addition to being an RS-232 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, MicroLink-HM will function as a standard HART protocol modem and not poll Fill Modbus Registers HART devices to fi ll Modbus registers. In this mode HART packets are received and then retransmitted at the HART 1200 baud, odd parity.

  • Page 6: Modbus Address

    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 fractional information, the number of decimal places is stored in a separate Modbus register and applied later.

  • Page 7: Hart Settings

    Setup Registers The MicroLink-HM confi guration can be changed using the setup and confi guration software or by writing 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 information 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 information 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 ad- dress 0 is used then only one device can be polled and Device 1 should be set to 0. Address 0 is not valid in multi-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...

  • Page 15: Specifications

    Specifications Enclosure Modbus RTU Polycarbonate plastic with Stainless Steel Cover Baud Rates ............1200, 2400,4800, 9600 Weight ..................5 ounces 114400, 19200, 38400, 57600 Mounting ..............35mm DIN Rail Clip Parity ................None, Odd, Even Floating point byte order ......AD-CD or CD-AB (swapped) Number of polled HART devices ..........1 to 16 RS-232 Serial Port Variables per polled HART device ......(4) PV, SV, TV, FV...

  • 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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