add warning about Chain parameter

diff --git a/trb3/DacProgramming.tex b/trb3/DacProgramming.tex
index 3d4c60a56663fa656df4468d395564fb428a7b1f..f8bf56234cfe314dcd1d83fd4961b47006926010 100644 (file)
--- a/trb3/DacProgramming.tex
+++ b/trb3/DacProgramming.tex
@@ -52,7 +52,9 @@ The ASCII format is shown below, the commands can be found in table~\ref{ltc2600
  \item Value: The value to load. 16 Bit value. Note that we are using LTC2620 which are 12 Bit only, the lower 4 Bit are "don't care" in this case and should be 0
  \item The "!Reference" keyword is used to set a reference for all following values. E.g. one can set the reference voltage used on the DAC and give all subsequent values in plain voltages. The format can be (almost) any number: integer, float or hex. The use is optional, if no reference is given, the upper limit is assumed to be 65536.
 \end{itemize*}
-
+\begin{warning}
+The Chain parameter is NOT the number of the chain, but a bitmask! This way, several DAC chains can be programmed in parallel. E.g. to access chain 4 (JKEL1 on Trb3sc) the parameter needs to be 0x10 or 16.
+\end{warning}
 \begin{table}
 \centering
 \begin{tabular}{c|l}