RS-232 Communication Troubleshoots

If the serial RS232 communication does not operate properly, EasyMotion Studio will issue an error message and you’ll see displayed on the status bar (the bottom line) of the EasyMotion Studio the text “Offline”.

1.	If the error message is “Cannot open the selected serial port”, the serial port you have selected from “Port” does not exist or is used by another device of your PC (mouse, modem, etc.). Click “Cancel”, reopen Communication \| Setup dialogue, select another serial port and try again.

2.	If the error message is “Cannot synchronize the computer and drive/motor baud rates” click “Cancel”, then check the following:

•	Serial cable connections

•	Serial cable type, if you use a standard cable. Make sure that the cable is non-inverting (one-to-one)

•

In “Communication | Setup” dialogue, the “Axis ID of the drive/motor connected to PC is” selection. If you use EasyMotion Studio with a previously bought drive/motor, this may not support the default option “autodetected”. Select the same axis ID with that of your drive/motor. The drives/motors axis ID is set at power on using the following algorithm:

a.	With the value read from the EEPROM setup table containing all the setup data

b.	If the setup table is invalid, with the last axis ID value read from a valid setup table

c.	If there is no axis ID set by a valid setup table, with the value read from the hardware switches/jumpers for axis ID setting

d.	If the drive/motor has no hardware switches/jumpers for axis ID setting, with the default axis ID value which is 255.

•	Drive hardware settings for RS-232 communication (see RS-232 Setup)

3.	If the communication operates usually but gives communication errors from time to time, check the following:

•	If your PC has an earth connection.

•	If your drive/motor is linked to earth. For the drives/motors without an explicit earth point, connect the earth to the ground of the supply/supplies.

•

In “Communication | Setup” dialogue click on the Advanced… button and increase the “Read interval timeout”, “Timeout multiplier” and “Timeout constant” parameters. Note that these parameters are related to PC serial operation and usually the default values for these parameters do not need to be modified.

After you fix the problem, execute menu command “Communication | Refresh” to restore the communication.