This repository contains a CA client program that works as the UDP daemon that saves data from Germanium detectors.

PV prefix is defined in prefix.cfg file.

1. Build

This program was created under EPICS framework in Linux, and configured per NSLS2 environment. To build on non-NSLS2 computers, redefine the location of EPICS base (EPICS_BASE) in configure/RELEASE.

2. Install

This software can be installed like a regular EPICS IOC using systemd-softioc/manage-iocs package. Refer to https://github.com/NSLS-II/systemd-softioc for details on how to install the package and the IOC.

3. Use

• Define PV prefix in prefix.cfg. It should be identical to the prefix used in the Germanium detector IOC. Follow the format in the existing prefix.cfg.

• Make sure this program is running before start counting on the detector, if data saving is desired. This is indicated by $(Sys)$(Dev):UDP_ONLINE.

• Restart the program if the detector is rebooted or the IP address of the UDP data connection is changed. This can be done either in the IOC shell, through manage-iocs restart germ_agent command, or by write 1 to $(Sys)$(Dev):UDP_RESTART. The program restarts automatically if the Germanium detector IOC has been restarted.

4. Troubleshooting

• If the UDP daemon reports network errors when starting, or if no data is received from the UDP connection, please check if the computer is aware of the device's MAC address:

arp | grep "00:01:02:03:04:05"

If no entries are returned, manually to add the ARP entry:

sudo arp -s ${UDP-IP} 00:01:02:03:04:05

Where ${UDP-IP} is the IP address of the UDP data connection, i.e., the value of $(Sys)$(Dev).IPADDR.