<p>From <a href="https://github.com/luke-jr/bfgminer/blob/bfgminer/README.ASIC#L89" rel="nofollow">BFGMiner's README.ASIC file</a>:</p>

<blockquote>
  <p>The U3 does not support autodetection, so you will want to use
  --scan-serial to manually probe it. For example, to scan all devices, you can use:</p>
  
  <p>-S antminer:all --set antminer:chip=BM1382</p>
  
  <p>Additionally, for optimal performance you will need to set voltage,
  clock, and timing. Voltage format for the U3 is not documented by the
  manufacturer, thus must be provided as hexadecimal configuration
  codes. Timing is provided in the number of nanoseconds each hash takes
  at the given configuration. A known-working configuration is:</p>
  
  <p>--set antminer:voltage=x800 --set antminer:clock=237.5
  --set antminer:timing=0.022421</p>
</blockquote>

CC BY-SA 3.0
2016-08-09T23:58:19.327Z
2016-08-09T23:58:19.327Z
Luke Dashjr
<p>I am using windows 7. I have installed the driver successfully by zadig. </p>

<p>In cgminer when I open the .bat file, it just doesn't open and gets closed immediately. </p>

<p>When I open in bfgminer it says no device connected.</p>

<p>Command:</p>

<pre><code>cgminer.exe -o xxx -u abc.worker -p x
</code></pre>

<cgminer><bfgminer><mining-setup>
Antminer U3 not detecting in cgminer nor bfgminer?
user31168
# Antminer U3 not detecting in cgminer nor bfgminer?

(Asked by: username_0 on 2015-12-13)

I am using windows 7. I have installed the driver successfully by zadig. 
In cgminer when I open the .bat file, it just doesn't open and gets closed immediately. 
When I open in bfgminer it says no device connected.
Command:
cgminer.exe -o xxx -u abc.worker -p x

**Tags:** cgminer, bfgminer, mining-setup


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## 1 answers

### Answer by username_1 on 2016-08-09. Score: 1

From [BFGMiner's README.ASIC file](https://github.com/luke-jr/bfgminer/blob/bfgminer/README.ASIC#L89):

> The U3 does not support autodetection, so you will want to use
> --scan-serial to manually probe it. For example, to scan all devices, you can use:
>
> -S antminer:all --set antminer:chip=BM1382
>
> Additionally, for optimal performance you will need to set voltage,
> clock, and timing. Voltage format for the U3 is not documented by the
> manufacturer, thus must be provided as hexadecimal configuration
> codes. Timing is provided in the number of nanoseconds each hash takes
> at the given configuration. A known-working configuration is:
>
> --set antminer:voltage=x800 --set antminer:clock=237.5
> --set antminer:timing=0.022421


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