HP 8648 A/B/C/D - Changpuak.ch

2-42 HP-IB Programming
The arbitrary messages can contain the following data.
FLEX/FLEX-TD: Frame Information and Block data
POCSAG: Message Codeword data
In other words, the arbitrary messages cannot contain the following
data, and the HP 8648A Option 1EP automatically generates these
data.
FLEX/FLEX-TD: Sync 1 and Sync 2 data
POCSAG: Pre-amble and the Synchronization Codeword
data
The data of each buffer memory segment can only be entered from
the external controller using the [SOURceI :PAGing [:FORMatl
:(POCSIFLEXIFTD) :ARBitrary :DEFine HP-IB command. Refer
to “PAGing Subsystem (Option 1EP Only)” for the details of this
command usage.
Note Since the arbitrary message cannot set the data rate and the
modulation settings, set them using the following commands.
For FLEX/FLEX-TD
PAG:(FLEXlFTD>:RATE (16001320016400)
DM:FORM (FSK2lFSK4)
DM:DEV 4.8 KHZ
DM:STAT (ONll)
For POCSAG
PAG:POCS:RATE (51211200124003
DM:FORM FSK2DM:DEV 3 KHZ
DM:STAT (ON113
When transmitting the arbitrary message, the start and stop segment
numbers of the buffer memory can be specified. The start and stop
values are set in the Message Menu (START FRAME and STOP FRAME
for FLEX/FLEX-TD; START BATCH and STOP BATCH for POCSAG)
from the frontpanelorbythe [SOURceI :PAGing [:FORMatl
:(POCSIFLEXIFTD) :ARBitrary :STARt and :STOP HP-IB commands
from the external controller.
For example, when the start and stop segment numbers of the buffer
memory are 8 and 11 respectively, and the encoding mode is burst
(the number of times is 2), the actual transmitted data is illustrated as
follows.
-----------------_--____________________-------
Buffer Memory I 8 I 9 110 Ill I 8 I 9 110 Ill I
Segment No.
I _____ I _____ I _____ I _____
l-----l _____ I--_-_I_-_--1