DESCRIPTION

The Compumotor Model 4000 can be used either over its GPIB or one of its two RS-232C interfaces. From the configuration editor, switch to the Device screen to select the appropriate version of the CM4000 controller from one of the following:

MOTORS        DEVICE   ADDR  <>MODE  NUM                           <>TYPE
   YES                    3            4           Compumotor 4000 (GPIB)
   YES    /dev/ttyS0     <>    9600    4  Compumotor 4000 (Serial port 1)
   YES    /dev/ttyS1     <>    9600    4  Compumotor 4000 (Serial port 2)

Corresponding entries in the config file are:

GP_CM4000  =  gpib_address  number_of_motors

RS1_CM4000  =  device_name  baud_rate  number_of_motors

RS2_CM4000  =  device_name  baud_rate  number_of_motors

On the Motor screen, select the CM4000 controller type for each motor to be controlled. Motors are assigned to the CM4000 channels in the same order they appear on the motor screen.

CONTROLLER SETUP

You must program the RS-232 baud rate or the GPIB address using the Compumotor front panel controls before trying to access it with spec. You should consult the Compumotor manual for details, but in brief, the procedure is as follows. First enter the ACCESS code (the factory default is 4000). Then choose the IMMED function, and then the DEFINE GPIB ADDR statement to select the the GPIB address. Alternatively, choose the IMMED function, and the the RS232 PORT1 statement to configure the baud rate for the RS-232 interface.

There are many other configuration options with this controller. Other than the GPIB address and the baud rate, you should probably not change any of these others. You can reestablish the factory defaults using the RESET function from the main menu.

Output pins 46 or 47 on the programmable output connector can be used to gate a counter during powder-mode scans. While the powder-mode motor is moving during these scans, spec sets pin 46 high and pin 47 low. Use the one appropriate for your particular counter. To gate the Ortec 994 counter/timer, for example, pin 46 and an even-numbered pin (all are logic ground) are connected to the front panel enable BNC connector on the Ortec module.