File AUTOEXEC.BAT

The AUTOEXEC.BAT file sets environment variables, loads the network software, retrieves the ZY software and then runs the software. The AUTOEXEC.BAT file for ZY102 looks like this:

  @echo off

  rem ********************************************************************
  rem System setup
  rem ********************************************************************

  prompt $p$g
  path a:\;a:\pctcp

  rem ********************************************************************
  rem Environment variables for this ZY
  rem
  rem variable:          Function:
  rem
  rem ziy       The location of the ZIY, ZY executables and init files
  rem user      The user account for the initialization files
  rem pass      The password for the user account
  rem initdir   The directory for the initialization files
  rem zyid      The ID number of this ZY. For example, for ZY0 zyid = 0
  rem zyaz      The I/O address of the AZ LM628 servo controller
  rem zyel      The I/O address of the EL LM628 servo controller
  rem pctcp     The location of the FTP PCTCP initialization files
  rem *******************************************************************

  set ziy=ziyp
  set user=ftp
  set pass=laser
  set initdir=GBTMetrology\init
  set zyid=102
  set zyaz=256
  set zyel=260
  set pctcp=a:\pctcp\pctcp.ini

  rem *******************************************************************
  rem Software to execute:
  rem
  rem Program:           Function:
  rem
  rem netbind   Binds the NDIS driver to the Packet Driver
  rem ethdrv    The FTP Software PCTCP kernel
  rem setclock  NTP client that sets the PC's clock to current date/time
  rem rload     Retrieves the ZY executable from ZIY host
  rem zy        The ZY
  rem *******************************************************************

  a:\ndis\netbind.exe
  ethdrv
  setclock
  rload hostdir=GBTMetrology\zy102 remote=zy.exe local=zy.exe
  zy

A line by line breakdown of what AUTOEXEC.BAT does follows:

prompt $p$g: Sets the style of the command line prompt. This is not required in any way by the ZY. It is here in case a technician needs to use the ZY computer's console for troubleshooting or maintenance.

path a:;a:$\backslash$pctcp: Sets the path DOS will use in executing subsequent commands, including the ones following in the autoexec.bat file.

set ziy=ziyp: This sets the environment variable ziy to the host name of the ZIY computer. The RLOAD.EXE and ZY.EXE will use the ftp protocol to retrieve the ZY.EXE executable and the ZY.EXE configuration files, respectively, from this host.

set user=ftp: This environment variable holds a valid ftp account name on the ZIY host computer named by the ziy environment variable. This account will be used by RLOAD.EXE and ZY.EXE to retrieve files.

set pass=laser: This variable holds the password for the account named in variable user. This password will be used by the RLOAD.EXE and ZY.EXE when retrieving files from the ZIY host. See remarks below.

set initdir=init: Specifies that the initialization files needed by ZY.EXE are to be found in the directory init in the home directory of the laser account.

set zyid=102: The variable zyid is used by the ZY program to find out which specific ZY it is running. In this case, this is ZY102. This allows the ZY to download the proper configuration files, allowing the ZY program to act as ZY102 should.

set zyaz=256: sets the I/O port address (in decimal) of the Azimuth LM628.

set zyel=260: Sets the I/O port address (in decimal) of the Elevation LM628.

set set pctcp=a:$\backslash$pctcp$\backslash$pctcp.ini: Sets the location of the PC/TCP initialization file [21].

a:$\backslash$ndis$\backslash$netbind.exe: Runs NETBIND.EXE. See subsection A.2.2.

ethdrv: Runs the PC/TCP kernel [21].

setclock: Runs SETCLOCK.EXE, a Network Time Protocol (NTP) client. This sets the PC clock to current UTC time and date.

rload hostdir=zy102 remote=zy.exe local=zy.exe: Retrieves the ZY program file from the ZIY host. RLOAD.EXE is a small FTP protocol client that, given the right command line arguments and/or environment variables, will retrieve a specified file from an FTP server. (see subsection A.2.6).

zy: Runs the ZY. At this point, the ZY computer is under control of the ZY program.

Note that the AUTOEXEC.BAT file must store the user account name and password for the account on the ZIY host where the ZY executable and its initialization files are stored. To ease security concerns and to make this aspect of the ZY immune to changes in passwords on the ZIY host, the files needed are placed a read-only ftp directory structure in the anonymous ftp area of the ZIY computer.