SME Digital Modulation
1038.6002.02 2.105 E-13
ALPHANUM MESSAGE
Opens a window to select an alphanumeric message and to create
a new one. The following is available:
FOX "The quick brown fox jumps over the lazy dog"
ALPHA "ABCD..." (complete ERMES character string)
LONG Message completely filling a batch
USER1 to 3 Three messages which can freely be edited by means
of command EDIT MESSAGE..
IEC-bus command :SOUR:ERM:MESS:ALPH "FOX"
EDIT MESSAGE
Opens a window to edit one of the alphanumeric messages USER1
to USER3. The message to be processed must be selected using
ALPHANUM MESSAGE.
IEC-bus command :SOUR:ERM:MESS:ALPH:DATA "Test"
--- BIT ERRORS ---
The SME offers the possibility of providing a 30-bit word of the
message transmitted with bit errors for test purposes. The
parameters of this section determine the faulty bits and their
position.
ERROR BIT MASK
Input of the faulty bits into a 30-bit field. The decimal number
transmitted (0 to 1073741823) is converted into a 30-bit binary
number internally and thus determines the 30 bits. These bits are
XORed with the word of the message to be corrupted and thus
determine which bits of this word are transmitted correctly or
wrongly.
IEC-bus command :SOUR:ERM:ERR:MASK 0
POSITION OF ERRONEOUS
BATCH
Input value of the batch in which the faulty word is to be.
IEC-bus command :SOUR:ERM:ERR:BATC A
POSITION OF ERRONEOUS
WORD
Input value of the faulty word. 0 to 153 are valid values
(0 to 189 for a long batch)
IEC-bus command :SOUR:ERM:ERR:WORD 1
--- MESSAGE SEQUENCE ---
The SME always sends complete cycles from five subsequences.
Two types of subsequence are generated. In the message
subsequence, fill data and message data are mixed, the fill
subsequence only contains fill data. The message subsequences of
a cycle only differ in the subsequence number contained, they
cannot be configured differently. I.e., the settings under BATCH are
valid for all message subsequences of a cycle.
The fill subsequences cannot be configured, the subsequences of a
cycle also only differ in the subsequence number contained.
The parameters of this section determine how the message
subsequence is structured and when which subsequence is sent.
BATCH
For each of batches A to P of the message subsequence, a
determination is possible whether it contains message data (an X
under the letter) or fill data (a blank under the letter). Operation is
analog to the variation of a number with the rotary knob, however,
the characters are restricted to 2 there.
IEC-bus command :SOUR:ERM:SEQ:DBAT A, B, G,H
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