Table of Contents
Advertisement
9.3 Technical description
Introduction
This unit makes it possible to communicate with the projector. You can interface with the projector in several ways:
•
Communication port : communication with Barco equipment (RCVDS, ... )
•
RS232 and RS422 port with active and passive loop through
•
Infrared (IR) receivers at the front and rear side of the projector
•
Local keypad with LCD display
•
Wired remote control via jack or XLR plug
•
Rugged wired remote with local keypad and LCD display
•
Error display
•
Optional Network Interface
RCVDS Communication
•
If the RCVDS is present, the RDY line is pulled high. This switches the TX_RCVDS signal to pin 3 of the comm. port connector.
If an external information display is connected, the RDY line is pulled low thereby switching the SDA_COMM line to pin 3.
•
The PPM or RC5 signal on pin 1 is AC coupled by C1 and clamped between 0V and 3.3V by D10 and D9-Z4. This is done to
get good communication across long cables.
•
All inputs and outputs are protected by series resistors and diodes. The ++24V is short circuit protected by PT2. The ++9V
also has short circuit protection in I7.
RS232/422 Communication
•
The RS232 and RS422 signal levels are converted into TTL levels and visa versa by means of I5. It can by switched between
the two RS modes by means of the RS422_SEL line. The signals also have an active loop-through between J2 and J3.
•
With the N_LB line the RS drivers in I5 can be tested. The TX_PC signal is looped back to the RX_PC line through the internal
drivers without changing the external RS signals.
•
With power off, the TXD and RXD lines are looped through between J2 and J3 by means of relays S1 and S2. The outputs of
I5 are in high impedance mode at that time.
•
The RS422 inputs can be terminated with a 120 Ohm resistor through relay S3. It can be selected with the RS422_TERM line
only in the RS422 mode.
•
All inputs are protected by series resistors and diodes.
IR Reception
•
All RC5 signals are added onto the IRQ_RC5 line coming from the local keypad and going to the controller. It is pulled high by
R9 and made glitch-free by means of C3.
•
The RC5 signal coming from the jack or XLR wired remote is detected via the current sense resistors R10 and R11. The signal
is then AC coupled by C2 , clamped with D33 and drives the transistor Q3. On the base of Q4 the RC5 signals of Q3 and the
IR receivers are combined.
•
The signals IR_FRONT and IR_REAR can come from the connectors J7 and J6 or from the flexfoil connector J700. For direct
connection with a processor board the 0 Ohm resistors R61 and R62 have to be removed.
•
The IR receivers can be switched off only if a wired remote control is connected. Only then are Q6 and Q8 in the off state. This
is why, in case of the XLR connection, pin 3 has to be externally connected to ground. The rear receiver can be disabled with
the IR_DISR line, the front and display receivers can be disabled with the IR_DISF line. The transistors Q7, Q5 and Q11 take
care of that.
ERROR display connection
•
The two 7 segment displays are controlled by the I2C lines SDA_ERROR and SCL_ERROR coming from the processor board.
•
The red IR-received led is activated by a mmv of I4 triggered on the RC5 or PPM signal.
•
The green IR-accepted led is also activated by a second mmv of I4 triggered on the IR_OK line coming from the processor.
•
The yellow sync-present led is directly controlled by the L_YEL line.
•
The two-colored standby led is controlled by the /PMP_PE line. It also drives the RI signal on the RS232 port (pin 9) and the
TRIGGER OUTPUT port.
R5976820 SLM R12+ PERFORMER 08/03/2005
9. Communication Module R763768
57
Advertisement
Table of Contents
