Is it possible to control the Frequency Danfoss FC051 from a computer?

Question

Electronics

Good day colleagues.
At the moment, I am implementing the project "Press" for road builders (to test samples of the roadbed for destruction)
. During the work, a problem arose that I ran into and cannot solve it on my own (help).
To control a 3-phase press motor, the customer purchased a Danfoss FC051 frequency converter, which, alas, I have not encountered before. www.danfoss.com/Russia/BusinessAreas/DrivesSolutio...
Required: From the program developed by me via the rs-232 interface (485 in this model, which is essentially not important) to control the engine speed.
From the side of my software there are no problems .... I can issue anything to the port.
Problems (essentially my questions):
1) I have never come across this device before and I don’t know if it’s possible for it in principle ... control from the outside? (not by hand, of course)
Attempt No. 1
There is an MCT10 program for working with these converters .... but when I got acquainted with this product, I found out that this software only allows programming (configuring) the device ... no controls for changing the engine speed I did not find.
(The logic was to use the port sniffer to determine the control commands and implement them in my software.) - did not work.
Attempt No. 2
The device I tested has a panel for manually configuring the chastotnik and controlling it.
Having disassembled this socket, I found out ... that its communication with the main processor of the device occurs via
interface rs-232
. I tried to count control commands but crashed because it seems that some kind of special protocol was implemented (or I just didn’t figure it out.)
Attempt No. 3
This device has the ability to step change the rotation speed by sending a pulse to a certain input of the frequency converter (I close through the relay to the ground). ..
I implemented this feature. Alas, the step with which the speed switching will occur is fixed and is set in the device configuration settings.
If there are competent specialists in this device, can you advise a program for controlling (smooth ... without steps) this device, or a protocol and control commands (start \ stop \ reverse \ speed change).
The materials from the site did not bring any clarity ... except for configuring the device .... so I ask for help.

Answer 1

Supports the widely used Modbus RTU protocol (and some other FC protocol, it seems to be a purely danfoss protocol)
www.danfoss.com/NR/rdonlyres/44CBE88E-E0B5-4663-A3...
Description of protocols in section 8
Answer - control from outside is available, of course. For this they are made - chastotniki.
And for modbus control, you need to find the registers you are interested in in the datasheet and, in accordance with the modbus protocol, form a datagram and send it to the frequency converter.
Under Windows, there are both Master and slave modbus-rtu protocol emulators (useful for tests and debugging)
And, of course, you need an RS232-RS485 or USB-RS485 converter

Answer 2

with line 72 at the bottom of the page "Working with preset speeds" ?