EPICS Device Support
For SL1000 Digitizers
Contents
 Introduction
 Support Modules
 Device Support
 Sample MEDM Viewer
 SummaryHajime Nakamura
andTakashi Asakawa
Yokogawa Electric Corporation, Japan

Joseph TingApril 2009

Yokogawa Corporation of America, the USA

Introduction
 The SL1000 is a data acquisition unit featuring fast dataacquisition and transfer, and data storage capabilities.
 The SL1000 series has a wide and varied module lineup.
 EPICS device support for waveform digitizers including
100MS/s, 10MS/s, 1MS/s, and 100kS/s has been recently
developed by Yokogawa.

SL1000 Data Acquisition Unit720210 100MS/s Digitizer Module2Support Modules

ModelSampling
RateResolution

Comments

720210100MS/s

12bitsIsolation

70125010MS/s12bitsIsolation

701251

1MS/s

16bitsIsolation

701255

10MS/s12bitsnon-Isolation

701260100kS/s

16bitsIsolation

These modules are supported by exactly the same (single) device support.

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Device Support
 The SL1000 is equipped with the 1000BASE-T Ethernet
interface.
 The SL1000 employs the VXI-11 protocol; the device
support requires the Asyn driver.
 The device support can read data during themeasurement (no need to stop the acquisition).
 The following basic features of the SL1000 digitizers aresupported: Data Compression
 Storage of Historical Waveforms
 SRQ Function (Asyn4.11 or later required)4

Device Support (cont.)
Key Features
Data Compression• SL1000 performs the peak-to-peak data compression.
• The device stores both raw data and compressed data
(2k points fixed) in the device memory.
• The device support can access either type of data.
• The device support further compresses the transferred
2k point data to a pre-determined number of points(default is 1k points) for display use.
• It is very beneficial to use the compressed data indisplaying waveforms; 1k points would be enough fordisplay use, while we can highly reduce the network
traffic load by using compressed data.
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Device Support (cont.)

EPICS• When anomaly in a signal is detected, raw data can beused for a precise analysis of the phenomenon.
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Device Support (cont.)
Storage of Historical Waveforms• Since SL1000 is equipped with a large acquisition
memory of 128MP, multiple waveforms can be stored.
• The device support can access historical waveform datastored in the device memory (by specifying a trigger
number of the waveform).

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Device Support (cont.)• The maximum number of waveforms which can bestored in the device depends on the number ofchannels and the record length:
Number of Channels

RecordLength

123, 45 to 89 to 16

10k

5000

5000

3275

1637

818

100k

1309

654

326

162

80

1M

127

63

31

15

7The maximum number of waveforms which can be stored in the device.

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Device Support (cont.)SRQ Function• The function is supported. At present (May/2009),
the Asyn driver in the CVS repository at ANL is required.
• Hopefully, the next version (Asyn4.11) or later will
officially support this function.

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Device Support (cont.)
Data Acquisition Sequence

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Device Support (cont.)Performance
The system works properly in the following conditions:

Transferred Data: Compressed Data (2k points/wave fixed.)
Data Size (points)

Sampling
Rate

RecordLength(points)

TriggerRate

No. ofChannels

Device->IOC

IOC->MEDM

1100MS/s

1M50Hz162k fixed

1k

2100MS/s

100k50Hz

42k fixed

1k

310Ms

100k50Hz

162k fixed

1k

41MS/s

10k50Hz

142k fixed

1k5100kS/s

2k25Hz162k fixed

1k

Note 1: The SRQ function is enabled.
Note 2: The performance limit is affected by the record length and the number of channels. Since the SL1000 is
optimized for transferring long data (e.g. 500k and 1M), the dependency of the performance on the record
length might be complicated. See the documentation on the device support for more details.

Note that these results do not warrant the performance.
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Sample MEDM Viewer
Main Display (Controller/Viewer)
Waveform Display

Channel Settings

TriggerParameters
Current Value
Measurement

DAQ Menu

TimingParameters

Sampling
Parameters

Module number and trigger numberof waveforms to be displayed.

This is for controlling the device and displaying compressed waveforms.
The number of modules equipped in the SL1000 unit is automatically detected.
Waveforms of the selected module (2 channels) are displayed at a time.
12Sample MEDM Viewer (cont.)
Raw Waveform Viewer
Waveform Display

The region of interest can be zoomed
up by specifying a start position and adata length (span) for the selected
waveform.

Start Position (point number)
History Number
Data Length (Span = No. of points)
Channel NumberTrigger Number
13Summary Device support for SL1000 digitizer modules has beendeveloped by Yokogawa.
 The digitizer modules including 100MS/s, 10MS/s, 1MS/s,100kS/s work properly with exactly the same devicesupport.
 Basic features of the SL1000 digitizers:- Data Compression,- Storage of Historical Data, and- SRQ Function
are supported by this device support.
Note: Our device support is of a sample and is supplied “AS IS”
without warranty of any kind.
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Thank you.