Civil Defense and Fire Siren Controller: Difference between revisions
Add info about cycle timer module and sections for pinouts |
Add pinouts of daughterboards, more info on cycle timer functionality |
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The DIP switch config for the steady 3 min cycle timer is, from left to right (Up = ON): up, down, up, down, down, up, down, up. This sets pins 1, 3, 6 and 8 high, and 2,4,5,and 7 low (the DIP switch numbers are backwards in reference to the IC pins). This equates to a RC time constant of 165. | The stock DIP switch config for the steady 3 min cycle timer is, from left to right (Up = ON): up, down, up, down, down, up, down, up. This sets pins 1, 3, 6 and 8 high, and 2,4,5,and 7 low (the DIP switch numbers are backwards in reference to the IC pins). This equates to a RC time constant of 165. | ||
Pin 13 of the IC is the RC input which is fed by a 1.1MOhm resistor and a 1uF 35v tantalum capacitor. Cross referencing those values in the datasheet chart, we get a RC timebase of 1Hz. The confusing part is that with these figures, we get a cycle time of | Pin 13 of the IC is the RC input which is fed by a 1.1MOhm resistor and a 1uF 35v tantalum capacitor. Cross referencing those values in the datasheet chart, we get a RC timebase of ~1Hz, though measuring via scope it shows the period to be 0.66Hz (1.5sec/cycle exactly). The confusing part is that with these figures, we get a cycle time of ~110 seconds, not 180. Still not super clear how this works. | ||
At low values it seems to be pretty accurate (eg. 5 sec), but with my test of "180s" (8, 6, 5 and 4 high) yielded approximately 3m18s (almost 200s). Timing the stock setting gets 2m57s, or 177s. | |||
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U1 - Motorola MC14081BCP<ref>https://www.mouser.com/datasheet/2/308/1/MC14001B_D-2315187.pdf</ref> (B-Series CMOS Quad 2−Input AND Gate) | '''U1''' - Motorola MC14081BCP<ref>https://www.mouser.com/datasheet/2/308/1/MC14001B_D-2315187.pdf</ref> (B-Series CMOS Quad 2−Input AND Gate) | ||
U2 - Motorola MC14011BCP<ref>https://www.mouser.com/datasheet/2/308/1/MC14001B_D-2315187.pdf</ref> (B-Series CMOS Quad 2−Input NAND Gate) | '''U2''' - Motorola MC14011BCP<ref>https://www.mouser.com/datasheet/2/308/1/MC14001B_D-2315187.pdf</ref> (B-Series CMOS Quad 2−Input NAND Gate) | ||
U3 - N/A (Populated on other boards) | '''U3''' - N/A (Populated on other boards) | ||
U4 - Maxim ICM7240IPE<ref>https://www.analog.com/media/jp/technical-documentation/data-sheets/1360.pdf</ref> (Programmable Timer/Counter IC) | '''U4''' - Maxim ICM7240IPE<ref>https://www.analog.com/media/jp/technical-documentation/data-sheets/1360.pdf</ref> (Programmable Timer/Counter IC) | ||
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*'''Left''' | *'''Left''' | ||
** P1-1: | ** P1-1: Signal Out to Relay Driver | ||
** P1-2: | ** P1-2: STOP (Local control via terminal strip) I assume this pulls pin 10 of the ICM7240 to GND(?) to reset the chip cycle. COM is referenced to GND on the terminal strip. | ||
** P1-3: | ** P1-3: START (Local control via terminal strip) I assume this pulls pin 11 of the ICM7240 to GND(?) to trigger the cycle. | ||
** P1-4: | ** P1-4: Trigger Input? (Goes to STOP terminal on terminal block as well as P2-4 on decoder module B?) | ||
** P1-5: Vin (+12v) | ** P1-5: Vin (+12v) | ||
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* '''Right''' | * '''Right''' | ||
** P2-1: GND | ** P2-1: GND | ||
** P2-2: | ** P2-2: N/C on Main Board | ||
** P2-3: | ** P2-3: Coupled to GND via C44 | ||
** P2-4: | ** P2-4: N/C on Main Board | ||
** P2-5: | ** P2-5: N/C on Main Board | ||
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File:Cdf_relay_driver_schematic.png|Reverse engineered schematic of the relay driver. | File:Cdf_relay_driver_schematic.png|Reverse engineered schematic of the relay driver. | ||
</gallery> | </gallery> | ||
'''Pinout (left to right):''' | |||
*'''Left''' | |||
** P1-1: N/C on Main Board, but traces route to it on driver board | |||
** P1-2: Signal Input from timer | |||
** P1-3: N/C on driver board | |||
** P1-4: N/C on driver board | |||
** P1-5: Vin (+17v) | |||
* '''Right''' | |||
** P2-1: GND | |||
** P2-2: Relay Coil | |||
** P2-3: Relay Coil | |||
** P2-4: N/C on Main Board, but traces route to it on driver board | |||
** P2-5: N/C on Main Board, but traces route to it on driver board | |||
<br /> | <br /> | ||