Difference between revisions of "7501T8"
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| − | == | + | ==Relay rack power== |
You must supply 5 VDC power to the relay rack. Typically this is done by connecting an external 5 VDC power source to the relay rack's +5V and GND terminals. The 5 VDC power source must share a common ground with the computer power supply. | You must supply 5 VDC power to the relay rack. Typically this is done by connecting an external 5 VDC power source to the relay rack's +5V and GND terminals. The 5 VDC power source must share a common ground with the computer power supply. | ||
Revision as of 10:51, 13 July 2018
Models 7501T8, 7501T16 and 7501T24 are solid-state relay (SSR) racks that accommodate (up to 8, 16 and 24, respectively) G4 type SSR modules. Except where specified otherwise, this document applies to all three relay rack models.
Pinout
| Relay Rack | GPIO | |||||||
|---|---|---|---|---|---|---|---|---|
| Model 7501Txx |
SSR Socket |
Header Pin |
TB Pins (+/-) |
Model 826 | Model 2410 | |||
| J3 | J2 | |||||||
| 8 | 16 | 24 | 0 | 47 | 1 / 2 | 0 | 24 | 17 |
| 1 | 45 | 3 / 4 | 1 | 25 | 19 | |||
| 2 | 43 | 5 / 6 | 2 | 26 | 21 | |||
| 3 | 41 | 7 / 8 | 3 | 27 | 23 | |||
| 4 | 39 | 9 / 10 | 4 | 28 | 9 | |||
| 5 | 37 | 11 / 12 | 5 | 29 | 11 | |||
| 6 | 35 | 13 / 14 | 6 | 30 | 13 | |||
| 7 | 33 | 15 / 16 | 7 | 31 | 15 | |||
| 8 | 31 | 17 / 18 | 8 | 32 | 1 | |||
| 9 | 29 | 19 / 20 | 9 | 33 | 3 | |||
| 10 | 27 | 21 / 22 | 10 | 34 | 5 | |||
| 11 | 25 | 23 / 24 | 11 | 35 | 7 | |||
| 12 | 23 | 25 / 26 | 12 | 36 | 41 | |||
| 13 | 21 | 27 / 28 | 13 | 37 | 43 | |||
| 14 | 19 | 29 / 30 | 14 | 38 | 45 | |||
| 15 | 17 | 31 / 32 | 15 | 39 | 47 | |||
| 16 | 15 | 33 / 34 | 16 | 40 | 33 | |||
| 17 | 13 | 35 / 36 | 17 | 41 | 35 | |||
| 18 | 11 | 37 / 38 | 18 | 42 | 37 | |||
| 11 | 9 | 39 / 40 | 19 | 43 | 39 | |||
| 19 | 7 | 41 / 42 | 20 | 44 | 25 | |||
| 20 | 5 | 43 / 44 | 21 | 45 | 27 | |||
| 21 | 3 | 45 / 46 | 22 | 46 | 29 | |||
| 22 | 1 | 47 / 48 | 23 | 47 | 31 | |||
The relay rack has a 50-pin header which is compatible with several Sensoray GPIO products, including models 826 and 2410.
All even-number header pins are shorted together and to the GND terminal. The odd-number pins are assigned as shown in the pin function table.
Relay rack power
You must supply 5 VDC power to the relay rack. Typically this is done by connecting an external 5 VDC power source to the relay rack's +5V and GND terminals. The 5 VDC power source must share a common ground with the computer power supply.
In some cases you may be able to obtain relay rack power from the GPIO board, which will allow you to omit the external power supply. Refer to the sections below for details.
Using with Sensoray 826
The relay rack requires 5 VDC operating power, which typically is supplied by an external power supply connected to the +5V and GND terminals. Alternatively, you may modify the relay rack as follows: On the bottom of the relay rack, attach a wire (via solder) from the +5V terminal to J1 pin 49. This will use +5 V from the 826 board to power the relay rack.
The relay rack may be connected to header J2 or J3 on the 826 board. The Pin function table (see above) shows the GPIO associated with each SSR. For example, if the relay rack is connected to J2 then SSR2 will be associated with GPIO26.
An output SSR is controlled by writing to the associated GPIO, whereas an input SSR is monitored by reading the GPIO. Model 826 has active-low GPIOs and the relay rack is designed for active-low signaling. Consequently, you must write '1' to turn on an output SSR and write '0' to turn it off. Similarly, when reading an input SSR, '1' indicates the relay is on and '0' indicates off.