How to start EDTM pulser (experts only)

1 Open a terminal from any computer in counting house and type the command:

 ->telnet hatsv4 2004

2 After connecting to that port and hitting the enter key, a prompt should pop up and we can set the EDTM pulser rate by the following command:

 ->r_pulser_Start(0,0xa100,0xc339)

The meaning of the arguments are explained below.

3 To quit from telnet, hold the "ctrl" key and hit "]". we should then see a prompt like "telnet>". Now type "q" to close the connection.

The EDTM pulse is now supplied by a synchronous pulser generator based on VME programmable logic. The generator has two synchronous outputs and the output rates are controlled by the second and third argument in the function r_pulser_Start() respectively. Currently the second output is used to feed the EDTM module and the first output is irrelevant. We shall set the first argument in function r_pulser_Start() to be 0 to set the rate of both outputs of the pulser generator.

The table showing the correspondence between the pulser rate and the hexadecimal words used in the r_pulser_Start() function can be found by typing the following command in a terminal opened on a computer in the counting house:

 >less /adaqfs/home/adaq/vme/rpulser/obs.txt

Intel Version

The crate containing the random pulser has both a Vxworks CPU (happex8) and an intel CPU (intelha3). As this crate is being used to read some F1 TDCs, using the intel ROC, the r_pulser library has been ported to Linux to run on intel ROCs, in case the Vxworks CPU needs to be reomved from the crate. This ported version is in /root/rpulser on intelha3. The available commands can be seen by running

 /root/rpulser/rpulserl usage

The pulser can be started with

 /root/rpulser/rpulserl start 0 0xa100 0xc339

This command has been placed in the boot script for intelha3. The equivalent command has been commented out of the boot script for happex8.