RoboteQ AX2550/2850 user manual Analog and R/C Modes Data Logging String Format

Serial (RS-232) Controls and Operation

to revert the controller in the RC mode (the controller must be configured to default to RC mode).

RC Radio

Computer

	RC Activated
	Switch
	4.7k
RC3	Power Control
RC1
RC2	220uF

TxData	RC1/RxData
	RC2/InputF	Controller
RxData	TxData

FIGURE 60. External circuit required for RS232 to RC switching

The switching sequence goes as follows:

Upon controller power on with Radio off: (or Radio on with RC ch3 off)

•Controller run in RC mode (must be configured in RC mode)

•Computer must send 10 consecutive Carriage Returns. Controller enters RS232 mode

Controller is on, Radio urns On with RC ch3 On

•Controller is reset, returning to RC mode

•Controller will output the continuous parameter strings on the RS232 output.Com- puter thus knows that RC mode is currently active. Computer sends Carriage Return strings to try to switch controller back in RS232 mode. Since the RS232 line is not connected to the controller, mode will not change

Controller is on, Radio is turned Off (or Radio On with RC ch3 Off)

•Relay deactivates. RS232 now connected to shared input

•String of Carriage Returns now received by controller.

•Computer looks for OK prompt to detect that RS232 mode is now active. Then resumes normal operation.

Note: Wait 5 seconds for the capacitor to discharge before attempting to switch to RC mode if doing this repeatedly. Controller will not reset otherwise.

Analog and R/C Modes Data Logging String Format

When the controller is configured in R/C or Analog mode, it will automatically and continu- ously send a string of ASCII characters on the RS232 output.

This feature makes it possible to log the controller’s internal parameters while it is used in the actual application. The data may be captured using a PC connected via an RS232 cable or wireless modem, or into a PDA installed in the actual robot. Details on how to wire the

102 AX2500/2850 Motor Controller User’s Manual Version 1.7. February 1, 2005