Setup COM Port
The RS-485 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
fi
rst 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
fi
nd the correct RS-485
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.
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. Using the RS-485 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
fl
oating point. Up to 4 variables for
each polled HART device.
In the accumulate mode, RS-485 MicroLink-HM will function as a HART master (primary or secondary) polling devices
and storing variable values into registers. No additional HART software 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 multi-drop loop. The device polling
address for each device is stored in the RS-485 MicroLink-HM using the RS-485 MicroLink-HM con
fi
guration software.
Modbus slave address, baud rate, parity, and other settings are set using the RS-485 MicroLink-HM con
fi
guration
software. Con
fi
guration is done using the same connection that Modbus will use, so no additional setup cable is re-
quired. After the con
fi
guration is completed, the port is connected to the Modbus controller. At power on the RS-485
MicroLink-HM will begin polling and accumulating values. Modbus RTU command 3 is used to read the accumulated
values.
MicroLink HM Installation - Windows
The RS-485 MicroLink-HM con
fi
gura 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 con
fi
gured to run the CD
fi
le when the CD is inserted you
will need to navigate to the
Msetup.exe
fi
le on the CD and double-click the
fi
le name to run it.
A er Installa on the HM Con
fi
gurator icon will be added to your system.
Don’t have a CD drive?
Download the HART Protocol CD image from
www.micro
fl
x.com/pages/support
Home Screen
The home screen displays a summary of the RS-485 MicroLink-HM
status, HART modem se ngs, and Modbus se ngs. Use the top drop-
down menus to con
fi
gure the RS-485 MicroLink-HM modem.
Figure 3. COM Port List.
Figure 4. RS-485 MicroLink-HM Setup home screen.
