Baud Rate Measurement And Ias Baud Rate - Wavecom W 4010 User Manual

IOC MODUL: Used to adjust the Index of Cooperation (in German: MODUL) to either 288 or 576; the se-
lected IOC being displayed in the status line. The IOC must be chosen before the synchronizing tones of 300
& 675 Hz. An IOC of 576 is by far the most commonly used value.
POLARITY POS-NEG: The key [BU-ZI] selects either positive or negative image polarity, the selected value
being displayed in the status line. Negative polarity offers advantages for the reception of satellite pictures.
PHASE LEFT / PHASE RIGHT: When the print-out is started by hand the converter has not received the
synchronization at the start of the transmission. In this case it is easily possible that the picture is not in the
middle of the paper. After manually starting, the W 4010 prints out a scale across the entire width of the pa-
per.
Use these keys to position the picture correctly. For example, when the left margin of the picture is under
the symbol <<5, push the keys [F1]+[F2] five times. The selected value is displayed in the status line. The
reaction of the printer is delayed, however, with the delay determined by size of the printer buffer.
FINE SPEED UP / FINE SPEED DOWN: The FAX picture is only synchronized at the beginning of trans-
mission. If there is a small difference in drum speed and the W 4010, the picture will start to drift in one di-
rection or the other. These fine speed (FS) keys can be used to compensate and correct this difference.
When the mode WEATHER-FAX is first used, the FS value is preset to 220. In the mode WEATHER-FAX CALI-
BRATION, pushing the key [F1] also presets the FS value to 220. The FS value is displayed in the status line.
If the picture is too far left, FS must be reduced; if too far right, FS must be increased. Since the FS value is
memorized, it only has to be adjusted once. If the FS value is changed, the printer output can be disturbed
for a short time.
FORM FEED ON/OFF: Form feed on or off can be selected by using [BU-ZI] and [F4].
PRINTER SELECT: A 9- or 24-pin printer can be selected by using [BU-ZI] and [F3].
EPSON LQ-500
STAR NL-10
BROTHER M1109
NEC P6
NEC P7
Additional hints:
In the mode WEATHER-FAX large amounts of data have to be processed and therefore the graphic data is
output only to the parallel print port and not to serial port.
The following are to be selected before the [TRAFFIC] LED glows:
- Drum speed RPM
- IOC MODUL
- Printer (9 or 24 pins)
- Polarity (pos. or neg.)
Adjustments made after this point lead to undefined printer outputs.
The [F1] key, when displayed in the menu, initiates a baudrate measurement. The measurement result often
indicates which signal type is being received. The first measurement stage is a rapid, preliminary measure-
ment which can differ from the effective baudrate. If a more accurate measurement is not desired, pushing
the [F2] or [F3] key causes a return to the respective operating mode.
if the key [F1] is pushed again, the IAS-BAUDRATE measurement starts. IAS means ISO-ASYNCHRON and
SYNCHRON. Baudot signals with one half stop bit can not be measured with this software. The software per-
forms signal calculations in large steps with the display changing in short intervals. After a short time, the
display PRECIS MEAS. appears, which means that only small variations with respect to the actual baudrate
are being measured. The measurement time in PRECIS MEAS. should be about 10 minutes.
EPSON LQ-400
STAR LC-10
SEIKOSHA SL-80AI
NEC CP6
NEC CP7

3.3 BAUD RATE MEASUREMENT AND IAS BAUD RATE

EPSON FX-80
STAR LC-24
Centronics GLP II
NEC P6+
EPSON FX-800
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