F-Code Programming - Philips VP415 Operating Instructions Manual

F-CODE PROGRAMMING
GENERAL INTRODUCTION
1bc VP41S player is designed 10 allow control of a• h1netions from an
u1emal computer. Connection 10 a compu1er
,S
via 1ht RS232·C serial
illlerfaceo, the SCSI interface o n 1hc rcarof1hc VP41S
1lte intcrlittt allows lwo-way communicalion bet...-cen player a nd
oomptiler. Some commands sent 10 the pla)·er are followed by
torn:5P(>~ing acknowledgements back to 1he computer.
R5ZJ:t-C INTERFACE CONNECTION
The!. is a serial computer interface, in accordance
with
international
communication slandards. Communication
is
full duplex, with a
sclcc1abkbaudra1c.
The player is fitted with a 25-pole female D-connector wi1h the
following pin connections:
PIN SIGNAL
2 (T•D) transmittcdda1afromplaycr1ocompater
) (RxD) reccivcdda ta fromoompulerloplayc r
S (CTS) clear to send:- a signal from rompu1er 10
player indicating the
computer
is
read)· 10
receive data
7 (GND) logicground
+12V/\00mA
10
-12VI\OmA
20 (DTR) da1a 1ennina tready:- a5ignalfro mpbyu
1ocompute rindica1ing1heplayeristtady
1orecciveda1a
UTR (DAT A TERMINAL READY) PIN 20
Whenever the player is in a condition to reuive data from the
oompu1er it signals 1his to the computer, by seuing 1he DTR line 10 a
highlevel( >+)V).
Conversely. when the playe r is busy proce~ing data ii is una ble to
receive data and indicates this lo the computer bysening the DTR line
to a negative level (
< - )
V ).
le -is imponant to
ensure that the data outpuc o f the compuler is
accuutely controlled by the DTR line
so as
10 prevwt panial loss or
data.
CTii
1 cu:AR
TO SEND) PIN 5
On
1he serial interface
or
many compu1en 1here is a
co•urol
line which
may be used
10
tell the player when the computer
G
ready 10 receive
data. Whenever the player wishes lo transmit data back to the
computer it fi~t checks the Slatus of the CT'S line. If lhe CTS line is
grea ter 1han + ) Volts the playe r assumes that the rotnpuler is ready to
~ceivc data, which is therefore transmitted.
If
the
CT'S
line is less than -3 Volts. the playe r ddays uansmission
indclinilely until the correct CTS status is seen.
Uthe computer cannot control the CTS line, it is recommended that
1he 'Tran"'1i5Sion delay on· )I command is sent 10 the player. This
re~ull~ in a transmission rate of 50 characters per uoond, giving the
computer more time to execute the characten. In lhiscase 1hc
CT'S
line
(pin S)shou\d
be
ke pi active (e.g. byleavint: Wcom1«tion open).
21
DATA FORMAT
Data formal is 8 dau bits and I stop bit (parity ignored).
Data sent lo the player should oomprii;e a strin1 of characle rs plus
carria1e~turn(CR).
Each by1e sen110 the player is checked
for
validity. ASCII
codes lower
than 32. and all other bytes of the s1rin1. arc rejected. ASCII codes
higher tha n
127
a re accep1ed. In this case. the
MSB
(mosi-sicnif.cant
bit) is always read
as
having a value of zero.
For ASCII valungreater tha n 127 the player effee1ively subCracis 128
from the ASCII value. A computer which transmits only seven d ala
bits per ASCII code may therefore be used. In this case at leas{ two
stopbitsmu!>lbcscnt.
The player actK>ns lhc commands after receiving (CR).
BAUD RA TE SETI'ING (RS13l-C only) (Fig.
'JJ
Data transmission
spero
may be set to 12txV2400/4800l96lU
bud
accordin& to ihe posi1ions of rhe two haud rate dip switches (numhcrs
I
and2) atthcrearof1heplayc r.
• • 12008AUO
• • 9600BALD
•a
2400 BAUD
• • 4800 BAUD
fl&,9:BHdnltdipiwikllcs.
When altering lhe positions of these dip switches, it is useful co lint
switch on lhe player and disc stalus display using the DISPLA Y
bu110fl
on the remote: con1ml handset. The baud rate setting
is thcndtsplayed
on the screen.
COMMANDS TO THE PLA \'J::R
The F•cocle commands that arc senl to 1he player to ea
TT)'
ou1 P!lrtkular
(unctions a rc lislc:d
i11
T ables
I
and
2.
Func1ional e1plana1ionsor these
commands a re
IM,?"
in Section
6 'F-CODE
COMMANDS'
Table
3
lislS adi;nowlcdgemcnts sent from the player
10
the
computer
on receipt
of cc:nain
commands.
PLAYER REGISTERS
The re are
lwo
picture number registe~ in the player; each ca n hold a
five-digit number from
I
to
79999.
Normally a disc can con1ain up to
around 54 OOO pictures (or frames) so numben beyond this are not
used. There I'S also a time code ugister which can store a time code of
the fonn mm:ss
in
lhe ra nge 00:00 to 59:59.
Picturr alldlbft --, rtpkr
This register is au1omatieally cleared to zero when the player reaches
1hepic1urenumhcrs10fedandcnten thestillmocle.
Pkt:111-.~iaronuliosln,pller
When the player passes the number s1oud. a n acknowlcdacmen1 is
sent back to lhe computer a nd the register is automalically clc:11cd.
The playing mode
doc1o
not change.
Tunceotlc:iale....iioarqisler
When the player passes the time code stored, an acknowledgement is
sent back 10 1he computer and the register is automatically cleared.
The playing mode docs not change.