Liz Chock
June 2002

Background

The DCS simulator is software which can emulate the real DCS (drive and control system) software used to control the telescope and rotator. This document describes the procedure for running this software for DEIMOS.

Notes

dcsSim task runs on polo to offload cpu usage from roto
real DCS keyword access (when in REAL mode) :
- from polo and keamano: same via dcs2 or dcs service
- from roto: via dcs2 service only
simulated dcs keyword access (when in SIM mode) :
- from polo and keamano: via dcs2sim service explicitly
- from roto: via dcs2 OR dcs2sim service
note that $KROOT/data directories differ on roto and keamano, so dcs*cake*real/sim links are changed only on roto

Procedure

Follow these steps to launch the simulator:

Configure software on `polo`

Log in to polo as user kics
Set up the EPICS env-vars for looking @ the dcsSim channels: (specify tdc, aux vme crates and polo where dcsSim runs; and avoid "ambiguous channel" errors when looking at dcs2sim keywords)
```
	setenv EPICS_CA_ADDR_LIST "128.171.136.30 128.171.136.35 128.171.136.63"
	setenv EPICS_CA_AUTO_ADDR_LIST NO
```
if the dcsSim task is not running in the background on polo, type:
```
	dcsSim dcs2sim < /tmp/fooliz &	
```
If /tmp/fooliz doesn't exist, just touch it.

test keyword access on polo:

	[593] kics@polo% show -s dcs2 az simulate instrume
                            az = 67.35 deg
                      simulate = false
                      instrume = ESI 
 
	[594] kics@polo% show -s dcs az simulate instrume
                            az = 67.35 deg
                      simulate = false
                      instrume = ESI 
 
	[595] kics@polo% show -s dcs2sim az simulate instrume
                            az = 350.07 deg
                      simulate = true
                      instrume = AO

Configure software on `roto`

Log in to roto as user kics:
Set up the EPICS env-vars for looking @ the dcsSim channels: (specify tdc, aux vme crates and polo where dcsSim runs)
```
	setenv EPICS_CA_ADDR_LIST "128.171.136.30 128.171.136.35 128.171.136.63"
	setenv EPICS_CA_AUTO_ADDR_LIST NO
```

Run check_dcs_mode will yield something like

	rotop:kics 294 % check_dcs_mode
 
		talking to the DCS SIMULATOR ...
  	                    instrume = AO 
   	                   simulate = true

To switch between modes, type
```
	make_dcs_sim
```
or
```
	make_dcs_real
```

Shutting down the simulator

Execute the following command on roto as user kics:
```
	make_dcs_real
```
Log in to polo as user kics and kill the dcsSim task

Liz Chock June 2002