User manual

Page 3
Document No. 80-15151 Issue 6 HEBER LTD
4.8 Sheet 8
This sheet shows various Power Supply related functions:
• Current sensing +12V Meter supply
• Power fail detection.
• Current sensing from Lamp Multiplex.
• Fuse and +5V regulator.
• Voltage rail overvoltage and transient protection.
• P3 “PWR IN” power input connector
4.9 Sheet 9
This sheet shows the following I/O connectors.
• P7 “REELS” carries enough I/O lines to run 6 reels, including a sub set of the lamp multiplexer and
power supplies for the motors.
• P8 “I/O 1” and P9 “I/O 2” are general purpose I/O.
• P11 “MULTIPLEX EXPANSION” provides signals for the connection of Multiplex Expansion
boards.
• P12 “AUX OUTPUTS” provides 6 open drain TTL outputs, typically for driving VFD displays.
• P13 “I
2
C” provides a connector for external I
2
C expansion, e.g. E
2
PROM modules. Note that the
lines used to implement this connector are different to the lines allocated for the internal I
2
C bus to
U40 and U37.
• P14 “I/O EXPANSION” is a position for a daughter board for I/O expansion.
4.10 Sheet 10
This sheet shows the following circuits and connectors:
• Reset circuit and LED.
• Battery Backup for RAM and optional Real Time Clock.
• Optional I
2
C Real Time Clock socket, U40, PCF8583.
• Optional I
2
C E
2
PROM socket, U37, 24C04 (512 bytes) or 24C08 (1024 bytes).
• RS232 buffers.
• P1 “RS232” is a general purpose RS232 serial communication port.
• P2 “DATAPORT” is the BACTA standard Dataport.
4.11 Sheets 11, 12 & 13
These sheets show the Multiplex Lamp and LED drive circuits and connectors.
• Sheet 11 shows the Lamp Columns/Digits Sink drivers.
• Sheet 12 shows the Lamp Row/Source drivers
• Sheet 13 shows the LED Segment drivers
• P4 “LAMP SINKS” is the Lamp Array Column/Sink outputs
• P5 “LED” is the connector for the 32 or 16 LED digits.
• P6 “LAMP SRC” is the Lamp Array Row/Source outputs