| 1 | GHIELMETTI FER 201 PAPER TAPE READER
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| 2 | ====================================
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| 3 |
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| 4 | The FER 201 (from the swiss firm Ghielmetti AG, made in May 1977) is a
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| 5 | photoelectrical paper tape reader. The reading unit is rather small,
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| 6 | measures only 150mm x 115mm, being about 100mm deep. It weights only
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| 7 | 1.2 kg. There are several variations how the unit is used - in small
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| 8 | boxes or with a weight 19" rack boiler plate, like mine.
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| 9 |
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| 10 | The FER 201 features a parallel interface (Cannon plug with 25 pins).
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| 11 | Like the FACIT 4070, it doesn't follow the IEEE 1284. I also get a
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| 12 | quite detailed manual (in German), printed in May 1977.
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| 13 |
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| 14 | This is the connector diagram for today's PCs:
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| 15 |
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| 16 | Input Signals
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| 17 | -------------
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| 18 |
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| 19 | All FER 201 input signals are active with "0". These are all possible
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| 20 | input signals:
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| 21 |
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| 22 | ES: static input
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| 23 | A negative signal fires one step. If the signal keeps after the
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| 24 | (output) Busy signal has fallen, the next step is triggered, etc.
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| 25 | The maximum read in speed is 250 bytes per second (4 ms).
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| 26 | We connect this signal to the computers STROBE to have full control
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| 27 | over the reading cycle.
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| 28 |
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| 29 | ED: dynamic input
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| 30 | A trailing edge on this input triggers a step.
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| 31 | ES and ED are locked while the device is BUSY.
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| 32 | We don't use this signal in favour of ES.
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| 33 |
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| 34 | RB: backward spooling
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| 35 | This will make the engine turning backwards. This is a typical
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| 36 | function which was used in former days because the devices
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| 37 | which used the paper tape reader didn't have enough capacities
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| 38 | to store or cache the read in data, so they spooled the paper
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| 39 | tape backwards and forwards all the time to jump into the
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| 40 | memory position in the paper tape, just like it's done in todays
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| 41 | byte code (e.g. with a JMP assembler instruction). This signal
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| 42 | could be attached to the AUTOFD, but for our driver it's doesn't
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| 43 | make any sense, because whenever we start the stepping motor, we
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| 44 | also want to read data.
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| 45 |
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| 46 | Standby: cut-off the engine
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| 47 | Logical 0 turns of electricy for the stepping engine. Whenever
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| 48 | the stepping engine is powered, the axis cannot be turned -
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| 49 | which is quite bad if you want to move the paper tape manually.
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| 50 | This signal can be connected to the trigger switch, so whenever
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| 51 | you open the clack, the engine will be turned off.
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| 52 |
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| 53 | RST: reset signal
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| 54 | If the clap is closed, a "0" signal resets the circuit logic,
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| 55 | so you can use BS or BD to read in a character.
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| 56 |
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| 57 | Output Signals
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| 58 | --------------
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| 59 |
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| 60 | KS: Klappenschalter-Signal (clack trigger switch signal, active "0")
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| 61 | The FER 201 features a clack which can be opened or closed
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| 62 | manually to place in the paper tape. When opened, the signal
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| 63 | goes to GND -- the signal is directly generated by the trigger
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| 64 | switch and thus not bounce-free. This signal can and should be
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| 65 | connected to the "Standby" input signal so the engine turns off
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| 66 | when the clack is opened.
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| 67 | Closing the clack generates internally a RST signal.
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| 68 |
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| 69 | BS: Busy signal (active "0")
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| 70 | This signal indicates that the reader is just performing reading
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| 71 | and cannot accept any other input signal. The reading cycle is
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| 72 | minimally 4ms.
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| 73 | If errors occur, the signal keeps until the reader receves a RST
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| 74 | signal (which is triggered by the KS signal, too).
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| 75 |
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| 76 | RS: reading signal (active "0")
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| 77 | The reading signal appears after the first feed hole signal and
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| 78 | leasts at least until the next feed hole. It indicates that the
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| 79 | current byte has been transfered to the storage.
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| 80 |
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| 81 | A1 - A8: data output
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| 82 | Normal mode: A hole equals locigal "1"
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| 83 | or inverted mode possible.
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| 84 |
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| 85 | Pin assignment and connection
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| 86 | -----------------------------
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| 87 |
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| 88 | FER signal PC pin PC Reg Function Notes
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| 89 | 201 direction and name Bit (for FER 201 pins)
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| 90 | (female connector) (male)
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| 91 | ----- ---------- -------- ------- --------------------------------
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| 92 | 1 RST <--------< 16 INIT 0 resets logics to initial state
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| 93 | 2 BS >--------> 11 BUSY active = 0: Device works
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| 94 | 3 ED < dynmic trigger (trailing edge)
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| 95 | 4 ES <--------< 1 STROBE 0 triggers step
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| 96 | +--< 5 KS >--------> 13 SELECT 0 = ppened, 1 = closed
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| 97 | | 6 A1 >--------> 2 Data0 \
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| 98 | | 7 A2 >--------> 3 Data1 |
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| 99 | | 8 A3 >--------> 4 Data2 | 8 Data IN
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| 100 | | 9 A4 >--------> 5 Data3 | registers, to be read from
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| 101 | | 10 A5 >--------> 6 Data4 | the computer!
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| 102 | | 11 A6 >--------> 7 Data5 | (byte mode or PS/2 mode)
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| 103 | | 12 A7 >--------> 8 Data6 |
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| 104 | | 13 A8 >--------> 9 Data7 /
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| 105 | | 14 RS >--------> 10 ACK 0 = you can read in the byte.
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| 106 | | 15 VCC - /- 18 GND +5V VCC, not used
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| 107 | | 16 VCC - |- 19 GND +5V VCC, not used
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| 108 | | 17 GND -\ |- 20 GND
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| 109 | | 18 GND -| |- 21 GND
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| 110 | | 19 GND -+------+- 22 GND
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| 111 | | 20 GND -| |- 23 GND
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| 112 | | 21 GND -/ |- 24 GND
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| 113 | | 22 +24V - \- 25 GND
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| 114 | | 23 +24V -
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| 115 | | 24 RB <(------)< 14 AUTOFD backward spooling (not mandatory)
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| 116 | +-> 25 Standby < 0 = engine turned off
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| 117 |
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| 118 |
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| 119 | Complete Impulse diagram
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| 120 | ------------------------
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| 121 |
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| 122 | 0 <---- 4ms == 250 bytes/sec ---> 4ms
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| 123 | time --+-------------------------------------------------+--->
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| 124 | . . .
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| 125 | RS ._____________________ .
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| 126 | ______| .|___________________________.__
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| 127 | . . .
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| 128 | A1-A8 . _______________________________
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| 129 | ___________________________| .
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| 130 | . . .
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| 131 | TR _________________________ ____________________________
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| 132 | . |_| .
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| 133 | . .
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| 134 | BS ___. .__
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| 135 | |_________________________________________________|
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| 136 | . .
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| 137 | CM ___. _________________________________________________
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| 138 | |__| .
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| 139 | . .
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| 140 | ED ___. _________________________________________________
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| 141 | |__| .
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| 142 | . .
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| 143 | ES ___. __________
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| 144 | |_________________________________________| .
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| 145 | . .
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| 146 | --+------------------------------------------------+--->
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| 147 |
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| 148 |
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| 149 |
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| 150 | Sven Köppel,
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| 151 | documentated at 13.09.2008
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