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    Hardware reference : Motors : Phytron IXE-a-C

Phytron IXE-a-C



Interface:
  • GPIB, Serial


config file

RS_IXE = device_name baud_rate number_of_motors 
GP_IXE = gpib_address number_of_motors 

edconf:   DEVICES screen 
MOTORS        DEVICE   ADDR  <>MODE  NUM                           <>TYPE 
   YES    /dev/tty00           9600    2             Phytron IXE (Serial)
   YES                    6            4               Phytron IXE (GPIB)


Finding Reference Positions:
The Phytron's axis initialization command "0" , which searches for the negative limit switch as described in the Phytron manual, is sent to a specific motor when the chg_dial() function is invoked with either the "home+" or "home-" arguments. The free-axis-displacement commands "L+" and "L-" are sent with the "lim+" and "lim-" arguments, respectively.

There is no fixed hardware signal for a home switch on the Phytron controller, but there are twelve digital inputs available on the input connector. There is also a command which will perform a relative move at the base rate until one of the inputs goes high or low or the magnitude of the move is reached. There are four parameters in this command: the direction of the move, the magnitude of the move, the binary input number and the sense of the input switch. All four parameters are set by entering a string as generic parameter 1 on the optional motor parameter screen of the configuration editor. (Get there by typing m twice from the standard motor parameter screen.) The string you enter will be sent to the motor when the "home" argument is used with the "chg_dial()" function. The string is the actual command sent to the Phytron, and is of the form 
         SmagvEnnD
where S is a + or a - for the sign of the move, mag is the magnitude of the move (maximum of 65535 steps), nn is the input number (01 through 12) and D is the sense of the input where 0 means the motor stops if the input goes off and 1 means the motor stops if the input goes on. For example, 
         +200vE071
would command the motor to move no more than 200 steps in the plus direction, or until input 7 goes ON.

Use the m command twice from the motor screen of the configuration editor to reach the screen where you can enter generic parameter 1. Type an initial single quote ' to enter a string.



Special Commands
On faster computers, the Phytron apparently cannot keep up with commands sent by the computer at full speed. You can slow down the communication between spec and the Phytron controllers with the following commands:

 

Function Reference:

motor_par(motor, "rdelay" [, value])
If value is given, sets the delay before reading a response from the Phytron to value seconds, otherwise returns the current value. The default value is 0.015.
motor_par(motor, "wdelay" [, value])
If value is given, sets the delay before sending a command to the Phytron to value seconds, otherwise returns the current value. The default value is 0.015.
Only one copy of the rdelay and wdelay parameters is kept for all the Phytron controllers. The motor mnemonic motor can be associated with any of the Phytron controllers. The values for the parameters are saved in the state file, so should only need to be reset after starting fresh. (See here in the Reference Manual.)

Command pass through is available using the following functions.

motor_par(motor, "send", cmd)
Sends the string cmd to the Phytron channel associated with motor .
motor_par(motor, "read", cmd)
Sends the string cmd to the Phytron channel associated with motor , as above, and returns a string containing the response.
motor_par(motor, "usend", cmd)
Sends the string cmd to the Phytron controller associated with motor .
motor_par(motor, "uread", cmd)
Sends the string cmd to the Phytron controller associated with motor , as above, and returns a string containing the response.
For example, 
     0.FOURC> print motor_par(tth, "read", "P20R")
     240000

     0.FOURC>
results in the string "\002XP20R\003\r\n" being sent to the controller. Command pass through should be used with caution to avoid interfering with the built-in programming commands spec sends to the Phytron controllers.

The following command is also available to help with debugging:
motor_par(motor,"dump")
Displays the values of Phytron parameters P01 through P10 and P12 through P17 for the channel associated with motor.

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