Pi-SPi-Series

Raspberry Pi DIN Rail Analog Output Interface

Posted by Vytas Sinkevicius on

Raspberry Pi DIN Rail Analog Output Interface

VP Process Inc has just released a new 4 channel Analog Output 4-20mA Interface, the PI-SPI-DIN-4AO. The 4AO is based on the Microchip MCP4728 12 bit DAC with I2C interfacing. The MCP4728 has up to 8 programmable I2C addresses, which means 8 of these modules can be daisy chained together for a total of 32 analog output 4-20mA signals. Combine this module with the other modules in this series, you now have some serious process control interfacing capability! The PI-SPI-DIN-4AO   The I2C interface has a bidirectional buffer that isolates capacitance and allows for up to 1MHz speeds and up...

Read more →

Raspberry Pi and the PI-SPI-2AO 4-20mA Output Interface

Posted by Vytas Sinkevicius on

Raspberry Pi and the PI-SPI-2AO 4-20mA Output Interface

The 4-20 mA analog signal is still a major part of process control infrastructure. The Raspberry Pi coupled with the PI-SPI-2AO Analog Output Interface provides 2 channels of 4-20 mA Outputs. The VDC outputs are the buffered VDC signal going to the output current generator.    The PI-SPI-2AO Interface uses a dual 12 bit DAC, the MCP4922. Each mA output has a mirror VDC output. The output circuit requires an external supply voltage. This example uses a wall adapter style 24 VDC power supply. Each output has a signal strength LED, in this example mA Output 1 is set to...

Read more →

Raspberry Pi DIN Rail I/O Interfaces

Posted by Vytas Sinkevicius on

Raspberry Pi DIN Rail I/O Interfaces

VP Process Inc has released three new modules in the PI-SPI-DIN series of DIN rail mountable interface modules: PCB's mounted with DIN rail clips:   and DIN Rail Enclosures:   At the heart of the PI-SPI-DIN Series is the main controller module that supports the Raspberry Pi: The PI-SPI-DIN-RTS-RS485 This main module accepts field power of 9 to 24 VDC and power the RPi through the 26 Pin GPIO interconnect cable. Basic specs are: Power Input: 9 to 24 VDC 5VDC @ 2.5A (Max 3Amp) Power Supply RS485 Output via RJ45 connector and Terminal Block 2 GPIO connectors - 1...

Read more →

Raspberry Pi New DIN Series of Interfaces

Posted by Vytas Sinkevicius on

Raspberry Pi New DIN Series of Interfaces

VP Process Inc has just released a new series of Raspberry Pi DIN rail mountable "Hardened" interfaces. The first to be released is the PI-SPI-DIN-RTC-RS485, which is available in three mounting versions: DIN Rail Clips DIN Rail Enclosure PCB Spacers      and finally a view of the PCB itself: The basic specifications for the PI-SPI-DIN-RTC-RS485 are: Power Input: 9 to 24 VDC 5VDC @ 2.5A (Max 3Amp) Power Supply RS485 Output via RJ45 connector and Terminal Block 2 GPIO connectors - 1 internal for Raspberry Pi, 1 external for peripherals 1 PI-SPI-DIN connector (16 Pin) for PI-SPI-DIN series (power,...

Read more →

Raspberry Pi and Wireless RS485 Display

Posted by Vytas Sinkevicius on

Raspberry Pi and Wireless RS485 Display

We decided to push our testing of the wireless 900 MHz RS485 interface to include the new PI-SPI-DIN series. From Left to Right: PI-SPI-DIN Controller - this module supports the RPI 3 on a DIN rail, has a 9 to 24 VDC power input, RS485, Battery Backed Real Time Clock RS485 to Zigbee converter in a  DIN rail enclosure RS485 to Zigbee converter at the pcb level VP-EC-RDU LCD Dispaly - Modbus RTU, 4 line x 20 character, 9 to 24 VDC Power Typically, in RS485 Modbus applications, you can attach up to 32 devices (or more depending on the...

Read more →