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The Decarad system was developed at JLab - it consists of 10 radiation detecting heads (geiger-mueller (GM) tubes) that connect (signal & HV cables) to a central box. That box has a board inside for changing the HV level and reading out the GM tube signals. The center box is connected to a digi port server via DB9 at box to RJ50 at the digi, which is then connected to the outside world via ethernet. The software uses the epics tool Stream with an asyn connection to the digi to send commands to the center box to read and write. The software is part of the RadiationMonitoring slac epics package.
Proposed PV names:
| PV Name | Purpose |
|---|---|
| $(P):FIRM | read firmware number |
| $(P):HRTBT | read heartbeat |
| $(P):HVSTAT | read status of high voltage |
| $(P):TEMP | read temperature of chassis |
| $(P):HVMON | high voltage reading (V) |
| $(P):HVSETPT | high voltage setting (V) |
| $(P):RACK:Position | String to hold a description of the rack position |
| $(P):nn:DoseRate | readback of dose from GM tube nn (01-10) in mR/hr (close enough, it saturates at xxx) |
| $(P):nn:Position | string to hold a description of the position of GM tube number nn |
| $(P):SEQ | sequence to readout the PVs at 1 Hz. The SEQ record has a delay of 0.06 seconds between sending 1 to each PV's PROC field so commands don't collide in the cable |
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