## SICS Hardware Configuration

Hardware is configured into the SICS system by executing special hardware configuration commands from the server initialisation file. These commands are described here. Much SICS hardware is hooked up to the system via RS-232 interfaces. The SICS server communicates with such devices through a serial port server program running on a Macintosh PC. All such devices require on initialisation the following parameters:

- hostname The name of the macintosh computer.
- port The port number where the serial port server program is listening for requests. It is given on the Macintosh screen when the serial port server is running. It is usually 4000.
- channel The number of the RS-232 interface on the Macintosh. 0 is the standard Macintosh modem port, 1 is the standard Macintosh printer port, 2 is the first connector on the interface extension box. This leads to much confusion which can be healed with a simple rule: If a device is connected to the Macintosh serial port extension box, then its channel number is the interface number on the box plus one.

### Motors

The following commands are available to install motors into the system:

Motor name SIM lowlim uplim err speed
  This command creates a simulated motor with the lower limits lowlim, the upper limit uplim, an ratio of randomly generated errors err and a driving speed of speed. Use this for testing and instrument simulation.
Motor name EL734 host port chan no
  This command creates a stepper motor named name which is controlled through a El734 motor controller. The parameters host, port, chan have the meanings defined above. no is the number of the motor in the EL734 motor controller.
Motor name EL734DC host port chan no
  This command creates an analog motor named name which is controlled through a El734DC motor controller. The parameters host, port, chan have the meanings defined above. no is the number of the motor in the EL734DC motor controller.

### Counting Devices

MakeCounter name SIM
  This command creates a simulated single counter accessible as object name.
MakeCounter name EL737 host port chan
  This command creates a single counter name, using an EL737 driver. The counter is at host host, listening at port port and sits at serial port chan.

#### Histogram Memory

Due to the large amount of parameters, histogram memories are configured differently. A histogram memory object is created using a special creation command. This command is described below. Then a lot of options need to be configured. The commands used for setting these options and their meanings are defined in the user documentation because histogram memories may be reconfigured at runtime. The sequence of configuartion options is ended with the command hmname init. This last command actually initialises the HM. Histogram memory objects can be created using the command:

MakeHM name type
  The parameter name specifies the name under which the HM will be avialable in the system. type specifies which type of driver to use. Currently two types of drivers are supported: SIM for a simulated HM and SINQHM for the SINQ histogram memory. Please care to note, that the SINQHM requires a EL737 counter box for count control. This counter must have been defined before creating the HM object.

As an example the configuration of a SINQHM HM with the name banana will be shown:

    MakeHM banana SINQHM
    banana configure HistMode Normal
    banana configure OverFlowMode    Ceil
    banana configure Rank     1
    banana configure Length   400
    banana configure BinWidth 4
    banana preset 100.
    banana CountMode Timer
    banana configure HMComputer psds04.psi.ch
    banana configure HMPort 2400
    banana configure Counter counter
    banana init

### Velocity Selectors

A velocity selector is configured in a three step process. First a Tcl array is filled with the necessary configuration options for the actual velocity selector driver. In a second step the velocity selector is created with a special command. In a third step the forbidden regions for the velocity selector are defined. Currently two drivers for velocity selctors are known: a SIM driver for a simulated velocity selector and a DORNIER driver for a Dornier velocity selector hooked to a SINQ serial port setup. The last one needs a parameter array containing the fields Host, Port, Channel and Timeout. Host, Port and Channel have the meanings as defined at the very top of this section. Timeout is the maximum time to wait for responses from the velocity selector. A large value is required as the dornier velocity selector is very slow. The second step is performed through the following commands:

VelocitySelector name tilt-motor SIM
  This command installs a simulated velocity selector with the name name into the system. tilt-motor is used for driving the tilt angle of the selector. tilt-motor must exist before this command can be executed successfully.
VelocitySelector name tilt-motor DORNIER arrayname
  This command installs a dornier velocity selector into the system. name and tilt-motor have the same meanings as described above. arrayname is the Tcl-array with the driver configuration parameters.

As an example the configuration of a dornier velocity selector named nvs is shown:

    set dornen(Host) lnsp25.psi.ch
    set dornen(Port) 4000
    set dornen(Channel) 6
    set dornen(Timeout) 5000
    VelocitySelector nvs tilt DORNIER dornen
    nvs add -20 28800
    nvs add 3800 4500
    nvs add 5900 6700
    nvs add 8100 9600

### Chopper

Chopper systems are handled via a generic controller object. This basicly consists of two components: One object represents the actual controller. This basic object allows to query parameters only. Then there is for each parameter which can be controlled from SICS in this controller an adapter object. These adapter object are virtual motors which can be driven with the normal run or drive commands. Currently two drivers for this scheme exists: one for a simulated device, the other for the Dornier Chopper Controller at FOCUS. The first step when initializing this system is the installation of the general controller object into SICS. This is done with the commands:

    MakeChopper name sim
    MakeChopper name docho mac port channel

The first command simply installs a simulated controller. The second command install a controller with a driver for the FOCUS Dornier Chopper system. Mac, port and channel are the usual Macintosh terminal server parameters which describe where the chopper controller is connected to through its RS-232 interface. After both commands the controller is available as command name within SICS.

A drivable parameter at this controller is installed with a command similar to this:

    ChopperAdapter vname cname pname lower upper

vname is the name under which the virtual motor will appear in SICS. cname is the name of the controller object installed into SICS with the commands in the previous paragraph. pname is the name of the drivable parameter in the controller. upper and lower are the upper and lower limits for this parameter. More then one of these commands can be given for each general controller.

After this, the parameter can be modified by a command like:

    drive vname newvalue

To be expanded. Please note, that environment devices such as temperature controllers are dynamically configured into the system at run time. Therefore the necessary commands are described in the user documentation.