Running simultaneous drives using RS232

[Sam Banout]

Hello everyone,

I have a few AM882 drives which I can communicate with individually using a serial cable (RS232-RJ11).

The performance of these drives is excellent.

As they have an internal pulse generator with microstepping, why can't these be operated without a separate controller (ex. UC300ETH-5LPT) and just receive their command through the serial cable.

Can the cable daisy chain from drive to drive where each drive has its owns address on the network?

If not, what is currently the top controllers to obtain very smooth motor rotation at low speed?


Thank you very much for the help

Sam

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[mactec54]

Hello everyone,

I have a few AM882 drives which I can communicate with individually using a serial cable (RS232-RJ11).

The performance of these drives is excellent.

As they have an internal pulse generator with microstepping, why can't these be operated without a separate controller (ex. UC300ETH-5LPT) and just receive their command through the serial cable.

Can the cable daisy chain from drive to drive where each drive has its owns address on the network?

If not, what is currently the top controllers to obtain very smooth motor rotation at low speed?


Thank you very much for the help

Sam

If the drives don't have built in plugs for daisy chaining them together then it is not likely they can be controlled this way

DMM has all of these methods for controlling a Servo Drive including daisy chaining them together and at very smooth any speed of operation, most of the high end Servo Drives like Yaskawa Etc. Can be daisy chained as well

DMM | Technology Solutions | AC SERVO DRIVE | AC SERVO MOTOR | ROTARY ENCODER

[he1957]

What do you want to do?

RS-323 was not originally designed as a multi-drop communication mechanism.

See this manual: http://www.cncshop.cz/PDF/AM882.pdf

The RS-232 communications port is for communicating with the on-board motor controls for setting various parameters as per the manual above. It is not designed to control the motors for computer controlled motion. Certainly not more than one at a time. This is what the step/direction inputs are for.

If one could control the motors in a multi-axis system using RS-232, there would have to be a packet based communications control protocol driven from the computer end to address an individually addressable motor (which is unlikely available) set up as an X, Y Z and others if more than 3 axis. This would become severly limited in execution speed because you could not send packets fast enough and then have the motor controls execute the packet command codes in interpolated moves to achieve satisfactory behaviour.

These drives should work just fine with the UC300ETH combination you cite.


Cheers,

HarryE.
===

[mactec54]

What do you want to do?

RS-323 was not originally designed as a multi-drop communication mechanism.

See this manual: http://www.cncshop.cz/PDF/AM882.pdf

The RS-232 communications port is for communicating with the on-board motor controls for setting various parameters as per the manual above. It is not designed to control the motors for computer controlled motion. Certainly not more than one at a time. This is what the step/direction inputs are for.

If one could control the motors in a multi-axis system using RS-232, there would have to be a packet based communications control protocol driven from the computer end to address an individually addressable motor (which is unlikely available) set up as an X, Y Z and others if more than 3 axis. This would become severly limited in execution speed because you could not send packets fast enough and then have the motor controls execute the packet command codes in interpolated moves to achieve satisfactory behaviour.

These drives should work just fine with the UC300ETH combination you cite.


Cheers,

HarryE.
===

There are many units like this also that can do what he wants if the servo drive supports RS232

https://www.walkerindustrial.com/SiN...ub-444-din.htm

There are also many servo systems that support and use RS232 Modbus or RS485 Can Communication

[DexterMeira]

Hi Sam!

You cannot do it, unless you are able to develop the entire system to work this way (and it will sucks anyway).

RS232 isn't the problem here, it is just the way via the communication happens, your problem is the protocol of the drive, that isn't made to fit what you're planning to do.

Anyway, RS232 isn't meant to multipoint communication because it isn't a differential system, what can lead to communication errors when "talking" in high speeds, this is why most chained communications uses some variation of RS485.

Live long and prosper,
Dexter Meira.

[Sam Banout]

Thank you so much for all your input.

I completely understand now that the rs232 is mainly to read and configure/tune the drive.

I will use a breakout controller board to interface with the drives.

I already have a 6 axis all-in-one TB6560 controller.
Can i redirect the pulse/dir signals from the output drivers to the AM882 drives?

[ger21]

Just use a $10 breakout board instead.

[he1957]

These may be using serial communications but there is an independent serial channel for each drive. The "hub" as they call it decodes the incoming target drive ID and sends the appropriate axis command to the attached drive. Clever, but not inexpensive :-)