You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 3 Next »

The Decarad system was developed at JLab - it consists of 10 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. It's connected to the outside world with DB9 connector. On the other end of that cable is an RJ50 that plugs into a 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 read and write. The software is part of the RadiationMonitoring slac epics package.

PV NamePurpose
$(P):FIRMread firmware number
$(P):HRTBTheartbeat
$(P):HVSTATstatus of high voltage
$(P):TEMPtemperature of chassis
$(P):HVMONhigh voltage reading (V)
$(P):HVSETPThigh voltage setting (V)
$(P):RACK:PositionString to hold a description of the rack position
$(P):nn:DoseRatereadback of dose from GM tube nn (01-10) in mR/hr (close enough, it saturates at xxx)
$(P):nn:Positionstring to hold a description of the position of GM tube number nn
$(P):SEQsequence 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

There are two sets of decarads (10 heads + central unit) so the PVs listed above are doubled and differentiated by $(P).
Suggested $(P) = 

Notes on cable connection (from email 8/12/21)

RJ50 cable/breakout (digiport server side)                              DecaRad Chassis DB9
Pins                                                                                                  Pins
1 blue/wht  TX-                                                                             2
2 org/wht    RX-                                                                             8
3 org      NC
4 green/wht   NC
5 green TX+                                                                                    7
6 brown/wht  RX+                                                                         3
7 brown    SGND                                                                            6
8 blk/wht    NC
9 black         NC
10 blue        NC

Using Decarad frame.pdf as the basic design

Thingsourcepart numberQty
for 2 frames		total
1.5x1.5" lite smooth 80-20

tecotechnology.com

prices from 8020.net

1515-LS-9610@72"
12@14"
12@24"		$7/foot comes to $700
flange mount for caster to cross piecetecotechnology.com

2426
attach kit: 3458

24 flanges

4*24 bolts/nuts

24*$23

4*24*$1 = $650


casterteco tech2323
attach kit: 3110

24

4*24 bolts/nuts

24*$30

4*24*$0.3 = $750


5 hole tee plate for lower cross piece to vertical pieceteco tech4340
attach kit: 3325

12
5*12 bolts

12*$10
5*12*$0.77 = $175


7 hole corner between end verticals and first upper horizteco tech4352
attach kit: 3325		4
7*4 bolts		4*$10.34
7*4*$0.77 = $65
6 hole T to connect upper horiz with verticals in the middleteco tech4310
attach kit: 3325		8
6*8 bolts

8*$10
6*8*$0.77 = $125


4 hole corner bracket to tie decarad heads to - only need two bolts perteco tech4301
attach kit: 3320		20
20*2		20*$5.12
20*2*$0.77 = $150
teco tech total (bob's total was $1k)


700+650+750+175+
65+125+150=$2615
wheel to hold 150' ethernet cable

2

75' retractable extension cord with 4 plugsamazon
22*$70 = $150
150' cat 6 ethernet cableBob says cablestogo
22*$110
cartmcmaster-carr2602T2422*$283.23 = $575
zipties for decarads 15"long by 1/2" widemcmaster-carr2113N5125$20
zipties for cables 11" long by 0.18" widemcmaster-carr7130K15100$11
power strip with GFCImcmaster-carr7693K4922*$87.31 = $175
DB9 female connectorL-comC&P9F44*$1.28 = $6
DB9 pinsL-comCPF1044*$4.74 = $20
DB9 hoodL-comSDC9AG44*$3.81 = $16
L-com total


6+20+16=$42

wheel for 150' cable: https://www.amazon.com/Woods-E103-Extension-Holiday-Storage/dp/B000E8SWQM/ref=sr_1_1?keywords=woods+e103+extension+storage&qid=1639714062&sr=8-1 (no longer available)

cabestogo 150 ft cat 6: https://www.cablestogo.com/product/43170/150ft-cat6-snagless-solid-shielded-ethernet-network-patch-cable-blue

black & Decker retractable extension cord 75' with 4 plugs: https://www.amazon.com/dp/B091GSSDVV/ref=sspa_dk_detail_3?psc=1&pd_rd_i=B091GSSDVVp13NParams&smid=A38BOHDI5WNXSO&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyODdYUlUwRkFJNjFJJmVuY3J5cHRlZElkPUEwODM4MDIxMVhZNUFRMEhaS0Y2RiZlbmNyeXB0ZWRBZElkPUEwMTkyNjcxMUtPMFJOUUo1RkxZTiZ3aWRnZXROYW1lPXNwX2RldGFpbDImYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl

Files from Bob and JLab folks (2020, 2021)
Com Cable Pinout.pdfDeca_stuff.tar.gzDecaRad_src.tar.gzdecarad_to_the_world.pdfdecarad_to_the_world.pptxDecRad System.docxiocnl22rfcry.tar.gzLND 714_DecaRad tube_datasheet.pdfSchematic.pdf80-20.xlsx80-20 Shopping Cart.pdfdecaraddocs.docxLND 714_DecaRad tube_datasheet.pdfDecRad System.docxDecarad frame.pdfdecarad_to_the_world.pdfhow long cables.pptx

  • No labels