Add Daq Channel

Step 2 — Load the .db in the softIOC

Edit /home/controls/labutils/epics/minimal_working_ioc.sh, add:

dbLoadRecords("/home/controls/labutils/epics/my_file.db", "P=Y1:,R=AUX-,DESC=,EGU=")

Then restart the softIOC on worker1:

sudo systemctl restart auxioc

Verify: caget Y1:AUX-MY_CHANNEL

Step 3 — Add channel to edc.ini on cymac1

SSH to cymac1 and append to /etc/advligorts/edc.ini:

[Y1:AUX-MY_CHANNEL]
datatype=5
units=myunit

Datatypes: 5 = float32 (for ao/ai/temperature), 4 = int32 (for integer/enum channels).

Note: Channels written by external code via caput use datatype=5 for floats, datatype=4 for integers. Binary (bi/bo) channels: use datatype=4.

Step 4 — Restart ALL four DAQ services on cymac1

Critical: Restarting only rts-edc is NOT sufficient. All four services must restart together:

ssh cymac1 "sudo systemctl restart rts-edc.service rts-local_dc.service rts-daqd.service rts-nds.service"

Wait ~10 seconds for them to settle.

Step 5 — Verify

From worker1, check connectivity:

# Channel is live
caget Y1:AUX-MY_CHANNEL

# cymac1 can see it
ssh cymac1 "caget Y1:AUX-MY_CHANNEL"

# Check NDS2 (use GPS time, not Unix time!)
python3 -c "
import nds2, time
conn = nds2.connection('192.168.1.11', 8088)
GPS_OFFSET = 315964818
gps_now = int(time.time()) - GPS_OFFSET
buf = conn.fetch(gps_now-30, gps_now-3, ['Y1:AUX-MY_CHANNEL'])
arr = buf[0].data
print(f'samples={len(arr)} mean={arr.mean():.3f}')
"

Use /var/lib/cds-conda/base/envs/cds-testing/bin/python3 if nds2 not in path.

Notes

• EDC status page: http://192.168.1.11:9000/
• edc.ini: dcuid=52, datarate=16 Hz
• NDS2 server: 192.168.1.11:8088
• NDS2 queries must use GPS time (GPS = Unix - 315964818), not Unix timestamps
• For calcout records that write to CDS channels via CA: softIOC's CA_ADDR_LIST must include 192.168.1.255 (subnet broadcast) — already configured in minimal_working_ioc.sh
• Documentation: /home/controls/Downloads/Private & Shared/Stream EPICS data to DAQ *.md