Bygonebytes

Signalling Electronics Section Cards and PCB's


Between 1979 and 1996 we designed and produced seventy two cards which were either stand alone or used to make up one of our TD, TDM, Protocol Convertor etc. systems. Below is a list of all the cards and a short description, a photo (if I've got one) and a note saying what system(s) they were used in. There were three cards made before I joined the Section, 73SES1 to 79SES1.

Boards were manufactured in various forms from strip board, in-house photo etched PCB and external PCB house.


73SES1 FLASHER UNIT

24VAC switching supply, Transistor/SCR.

76SES1 FLASHER UNIT MKII

24VAC switching supply, Transistor/SCR.

79SES1 FLASHER CONTROL UNIT MKIII

24VAC switching supply 1.5Hz. NE555/SCR

79SES2 FLASHER CONTROL UNIT MKIV


Switches 12V to 50V AC/DC at 1.5Hz, Relay Pin Code 250, Pin Configuration EFHJK, BR Cat. No.88/47287 NE555/FET.

79SES3 H.B.D. INTERFACE CARD (EDINBURGH)



79SES3 M1 H.B.D. INTERFACE CARD (EDINBURGH)



79SES4 / TD79/20 H.B.D. TRANSMITTER (EDINBURGH)


Frequency Shift output, Frequency determined by five inputs, Current sense, Integrity Monitor, Hot Left, Hot Right and Wheel Count. Base frequency 3KHz, Triangle wave.

79SES4 M1 / TD79/20 H.B.D. TRANSMITTER (EDINBURGH)

Frequency Shift output, Frequency determined by five inputs, Current sense, Integrity Monitor, Hot Left, Hot Right and Wheel Count. Base frequency 3KHz, Triangle wave.

79SES5 TECHNICIANS TEST SET (HAWKER SIDDELEY H.B.D.)



80SES1 BERTH SELECT & DISPLAY DRIVE CARD (BS&DD)

Routes the serial data to any one of 16 Train Describer displays.

80SES2 RELAY CONTACT TIMER

Times the operation of timer relays and displays time on an LCD screen. Battery operated.

80SES3 SINGLE CHARACTER DISPLAY MODULE


Based on the MM5241 character generator chip and uses a single FR Electronics DM75G12 green 5x7 dot matrix display. Consists of two PCB's piggy backed to fit in small case.

80SES4 DISPLAY CONTROL CARD (EDINBURGH H.B.D.)



80SES5 H.B.D. TEST UNIT (EDINBURGH)



80SES6 CLOCK & DISPLAY CONVERTER



80SES7 BERTH STEPPING CARD (AVIEMORE)



80SES8 AVIEMORE KEYBOARD



81SES2 TDM Output Card

An early version of the Demultiplexing Card 82SES3

81SES3 FOUR CHARACTER DISPLAY MKI (BOARD 1 & 2)


4 character display module based on EPROM character defintions. 5x7 Dot Matrix display, DM75G12

81SES4P H.B.D. INTERFACE CARD (MOTHERWELL)


The 81SES4P is an HABD Receiver and Locater built onto one double Eurocard. It receives, decodes and transmits the data to a TD display module. Also handles all the switch/button selections, acknowledges etc. The card was designed so it can be cut to single Eurocard size to build into a handheld portable Locator.

81SES5 H.B.D. PORTABLE LOCATOR DISPLAY CARD



81SES7 SECTION FAILURE INDICATOR


Two PCB's, 1) A variable Power supply whose output is diode protected and on/off controlled by external input. 2) An LM3914 LED bargraph display that indicates the incoming voltage. Each Location moving out from the Office (receiver) has a PSU 0.5V above the previous location. When a fault occurs the the highest voltage will show the fault at or between two locations. The photo has the PSU at the right hand side and again the second photo the receiver towards the right hand side.

82SES1 CONTROL CARD

8748 micro controller card, features 8251A UART, V24 and current loop transmission. Baud rate link selectable, Port 1 brought out to Edge Connector, Port 2 has 4 to 16 I/O Expander, Brown out protection and fault diagnosis LED's. The Control cards were used in our TD's and TDM (DAM) Systems.

82SES1 M1 CONTROL CARD MOD 1

Minor alteration to Fault circuit. 8748 micro controller card, features 8251A UART, V24 and current loop transmission. Baud rate link selectable, Port 1 brought out to Edge Connector, Port 2 has 4 to 16 I/O Expander, Brown out protection and fault diagnosis LED's.

82SES1 M2 CONTROL CARD MOD 2


As Mod 2 with Port 1 sockets modified for I/O use, optoisolate inserted in current loop circuit and 8251 UART TxRDY has direct input to Serial Data OK LED circuit.

82SES2 MULTIPLEXING CARD

14 optically isolated inputs multiplexed on to an 8 bit data bus organised in two 7 bit words. Has Change of State output, Scan Fail output and Ack Output. Each card has a hardwire identity.

82SES2 M1 MULTIPLEXING CARD MOD 1

14 optically isolated inputs multiplexed on to an 8 bit data bus organised in two 7 bit words. Has Change of State output, Scan Fail output and Ack Output. Each card has a hardwire identity. Additional decoupling and zener protection added for both internal and external power supplies.

82SES3 DEMULTIPLEXING CARD

14 relay output board. Decodes Data from a 8 bit data bus and organised in two 7 bit words. Mod applied so outputs only applied after a preset power on delay to ensure outs are valid. Each card has a hardwire identity.

82SES3 M1 DEMULTIPLEXING CARD

14 relay output board. Decodes Data from a 8 bit data bus and organised in two 7 bit words. Outputs only applied after a preset power on delay to ensure outs are valid. Each card has a hardwire identity. Relay voltage has overvoltage zener protection.

82SES4 TIMER DELAY UNIT (10 SECONDS)

12-50v input 10 second delay. Relay picks 10s after power is applied.

82SES5 RELAY TESTER

Tests a 4 contact relay for contact resistance to give a go/no go indication.

83SES1 BERTH STEPPING CARD (BSC)


Used to determine whether the Signalling Conditions and Trigger inputs as valid and sends the 'TO' address for that step to the micro processor. The picture show three different builds of the card.

83SES2 MASTER ROUTEING CARD (MRC)

TD Display data parallel to serial conversion and display selection. External interrupt handling.

83SES2 M1 MASTER ROUTEING CARD MOD 1 (MRC)

TD Display data parallel to serial conversion and display selection. External interrupt handling revised and latch added to address lines.

83SES4 MICRO CONTROLLER FOUR CHARACTER DISPLAY - CIRCUIT


Train Describer 4 character display module receive and display logic.

83SES5 MICRO CONTROLLER FOUR CHARACTER DISPLAY MATRIX


Train Describer 4 character display module DLG7535 Green DOT Matrix display front. High St. Train Describer.

83SES5 MOD 1 MICRO CONTROLLER FOUR CHARACTER DISPLAY MATRIX


Train Describer 4 character display module DLG7535 Green DOT Matrix display front. Dundee Train Describer.

83SES6 INTERFACE CARD TX/RX

24 optically isolated inputs, 24 relay driven outputs, Data and Address bus.

83SES8 O.C.U. LOGIC CARD

8748 microcontroller keyboard driver 6 column x 7 rows with EFA, NDA and alarms, 8251A UART with V24 or current loop transmission.

83SES9 AUXILLIARY I/O CARD

8748 microcontroller with 8 optically isolated inputs, 4 outputs, either/or FET driven, darling driven or 4 to 1 or'd darling driven. on board 1,5Hz and 19.2KHz oscillators.

83SES10 50V INTERFACE CARD

50V Pole change to v24 Rx/Tx.

83SES11 INVERTER - 12/50V DC TO 110V AC 250/500VA


12VDC input to 110VAC/200VA output or 50VDC input to 110V/500VA output.

84SES1 INDICATION LAMP INTERFACE CARD


Panel indication driver board.

84SES2 ROUTE & TRACK K.E. I/F CARD

Meshing logic for route and track panel indications.

84SES3 POINTS K.E. I/F CARD

Meshing logic for points panel indications.

84SES4 TRACK INDICATION CARD

Meshing logic for track panel indications.

84SES5 POWER SUPPLIES K.E. I/F CARD

Meshing logic for power supply panel indications.

85SES1 KEYBOARD MATRIX


Train Describer ABC Keyboard with 3 x Display Module DOT Matrix display fronts.

85SES2 ASAD CARD

8748/9 Micro controller with port expansion providing 12 optically isolated outputs, 8 optically isolated inputs, 3 to 8 line decoded outputs. 8748/9 Port 1 and Data bus fully available on edge connector, 8251 UART providing serial data I/O, V24 or current loop.

85SES2 M1 ASAD CARD MOD1


as above with Battery Backup option link selectable.

85SES3 DISPLAY MODULE TEST UNIT

A ScR TD display test unit. Transmits single characters to a display module using 6 bit binary setup and transmit buttons. Can also be connected to a computer to transmit the full 4 characters as three 8 bit binary words.

85SES4 905/Z80 BUFFER CARD

Interfaces the Mosek Z80 Microcomputer to read and write data the Elliot 905 TD Computer

85SES5A A.H.B./A.O.C.R. FAILURE INDICATION UNIT


Electronic Indication Unit with selectable 1 second, 3 minute and 4 minute delays.

85SES5B A.H.B./A.O.C.R. FAILURE INDICATION UNIT LEDS


LED Front Panel for Indication Unit.

85SES6 A.H.B./A.O.C.R. FAILURE INDICATION UNIT POLE CHANGE TO MODEM V24


Pole change to v24 for modem transmission and v24 to pole change for Electronic Indication Unit

86SES1 CATHCART DISPLAY MATRIX


TD display board for 5x7 dot matrix LTP305G.

88SES2 LINE PROTECTION UNIT

Provides overvoltage protection on Telecom Line circuits. Fuse, Gas Discharge Tube, Zenner Diode and Zenamic.

89SES1 ELECTRONIC EMERGENCY BLOCK BELL, VF Tx 1 / TO 6 TONES to GS/STDG 024

2 wire voice frequency transmission of Emergency single stroke bell. Up to six tones and was initially designed for the introduction of Yoker IECC.

89SES1 M1 ELECTRONIC EMERGENCY BLOCK BELL

As above, Data transmission modified to prevent false rings due to carrier loss.

89SES1 M2 ELECTRONIC EMERGENCY BLOCK BELL



As above, Improved debounce on carrier loss.

89SES2 SINGLE EUROCARD MODEM


Single Eurocard Modem based on the EF7910 Modem Chip. Fully RS232 compatible with TTL, CMOS and V24 level handshaking. Up to 4 wire 1200 Baud full duplex and line isolated. Single 12V Supply.

90SES1 SSI/905 TD INTERFACE CARD

Formally TDM/905 Interface Card.

90SES2 BUSBENDER

A double Eurocard that buffers bi-directional RD, WR, data and address busses and presents them between the upper and lower DIN connectors

90SES3 LINE ROUTING CARD


An intellegent 8749 based RS232 routing card. Routes any three inputs to any three outputs. Used for automatic data line changeover

90SES4* PSEUDO SPT - PULSE CODE GENERATOR

A 8748 micro controller dialling circuit for Signal Post Telephone. I don't think this circuit got into production as the control relay was discontinued during the trial stage.

90SES5 MODEM MONITOR

A card to to use in conjunction with a line monitoring system (Feline). Can listen on on both Tx and Rx analogue lines.

90SES6 DUAL RS232C/RS422 CONVERTER

A 3U single Eurocard dual RS232/422 bidirectional level converter.

91SES1 VIDEO RELAY DELAY TIMER (CCTV)

A 40 second power on delay for Marconi CCTV Camera - used to circumvent an issue with the Guardstream digital transmission system. The encoder would lock up if a composite video was presented to its input before it had fully powered up.

92SES1 ELECTRONIC CLOCK I/P MODULE

A non-retriggerable monostable driving a relay and LED. Relay contacts brought out to Clock Circuit input.

93SES1 DISPLAY MODULE - DISPLAY MATRIX (CLOCK)

Large 2" DOT matrix display front for TD display based sognal box clocks

93SES2* CLAUDS BOX - POINT MACHINE TEST UNIT

8749 Micro controller points machine test unit.

93SES3 CLOCK MODULE TX BOARD


Daughter board for the display module 83SES4. Turns the display module into a clock and can transmit the time to other 83SES4 display modules.

94SES1 EXPANDABLE INTELLIGENT I/O WITH MODEM & RS232

Single EuroCard 16 bit I/O TDM system - designed but not built. 8749 micro controller controlled, 16 bit optically isolated inputs, 16 bit FET driven outputs, 1200 baud 4-wire full duplex modem.

94SES2 BICU INTERFACE CARD

A reverse engineered card to enable life extension of the BICU (Block Instrument Control Unit) interface at Craigendoran.

94SES3 PC/905 DAUGHTER BOARD I/F MODULE

An daughter board interface module for the 905 TD Computer DP01 card. Interface for PC Data preparation system.