Appendix A
SCPI Command Reference
RFGenerator subsystem
4460 GSM System Option and 4468 EDGE System Option
Version 12.20
757
:RFGenerator:EGPRs:MODulation:DIFFbitcod
:RFGenerator:EGPRs:MODulation:POLarity
:RFGenerator:EGPRs:MODulation:TSEQuence:STATe
Description
Sets the coding scheme. If
:RFG:EGPRs:MOD:CHAN
is set to either
PDCH
or
BPDCh
, the Willtek 4400 transmits a packet data channel which is encoded using
this coding scheme.
Query
The query form of this command returns the current setting. The string delivered back
contains a one-digit number.
Example
:RFG:EGPRs:MOD:CS 4
>:RFG:EGPRs:MOD:CS?
Returns the following string:
4
.
Syntax
:RFGenerator:EGPRs:MODulation:DIFFbitcod <PredefExp>
Parameters
PredefExp
is one of the following predefined expressions:
ON|OFF
.
Default is
ON
.
Description
This command switches differential bit coding either
ON
or
OFF
.
Query
The query form of this command returns the current setting. A query will return a
string, containing one of the predefined expressions explained above.
Example
:RFGenerator:EGPRs:MODulation:DIFFbitcod ON
:RFG:EGPRs:MOD:DIFF?
Value returned in this example "
ON
".
Syntax
:RFGenerator:EGPRs:MODulation:POLarity <PredefExp>
Parameters
PredefExp
is one of the following predefined expressions:
NORMal|INVert
.
Default is
NORMal
.
Description
Sets the modulation polarity for the GMSK coded RF output signals.
NORMal
means standard modulation polarity while
INVert
will invert the modula-
tion polarity.
Query
The query form of this command returns the current setting. A query will return a
string, containing the short-form version of one of the predefined expressions
explained above.
Example
:RFG:EGPRs:MODulation:POLarity INVert
:RFG:EGPRs:MOD:POL?
Value returned in this example "
INV
".
Syntax
:RFGenerator:EGPRs:MODulation:TSEQuence:STATe
<PredefExp>
Parameters
PredefExp
is one of the following predefined expressions:
ON|OFF
.
Default is
ON
.