| 
Physical Characteristics | 
| Dimensions | 
PCB Stack 86(w) x 56(d) x 45(h) mm
 Base Mount 88 x 74 x 4.5 mm)(exludes DIN mount) | 
| Mounting | 
DIN Rail  | 
 | 
Raspberry Pi3B+ | 
Raspberry Pi4 | 
| Processor | 
Broadcom BCM2711 Quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz | 
Broadcom BCM2837B0 Quad-core Cortex-A53 (ARMv8) 64-bit SoC @ 1.4GHz | 
| Memory | 
1GB, 2GB or 4GB SDRAM
 Micro SD for Storage | 
1GB SDRAM
 Micro SD for Storage | 
| Power | 
POE, USB Micro-B, GPIO Header Input, 2.5A | 
POE, USB-C, GPIO Header Input, 3A | 
| LAN | 
300Mbps Ethernet (Gigabit over USB 2.0) | 
Gigabit Ethernet | 
Wireless LAN | 
2.4GHz and 5.0GHz IEEE 802.11ac | 
2.4GHz and 5.0GHz IEEE 802.11ac | 
| PAN | 
Bluetooth 4.2, BLE | 
Bluetooth 5.0, BLE | 
| Video | 
1x HDMI(1920×1080p) | 
2x Micro-HDMI(4096 × 2160p) | 
| Audio | 
3.5mm Stereo Jack | 
3.5mm 4-pole stereo audio and composite video port | 
| USB Ports | 
4 x USB 2.0, | 
2 x USB 3.0, 2 x USB 2.0 | 
| Other Ports | 
40 Pin Raspberry Pi GPIO Header | 
40 Pin Raspberry Pi GPIO Header | 
| Operating System | 
Debian Linux | 
 | 
UMD Raspberry Pi I/O Board Features | 
| Power | 
9-32V/DC direct input and PoE, supplies regulated 5V input to GPIO Header for Raspberry Pi | 
| Digital I/O | 
RS 232 Serial port - RS232 Levels port available on a IDC 10-way header TTL UART, SPI, I2C | 
| GPIO | 
5x Solid State Relay Outputs (500mA), 2x Opto-Isolated Inputs | 
| Visual Indicators | 
4x Power LED's, 1x RGB Status LED | 
| Buzzer | 
Digital - On-Board or Off-Board | 
| Real Time Clock | 
Onboard, Battery backup | 
| Other | 
Temperature sensor, Fan Connector, LED Array Connector, Slave I/O Processor, Push-Button | 
 | 
UMD Raspberry Pi Wiegand I/O Board Features (When used with Pi4) | 
| Power | 
12 or 24V/DC direct input, Optional PoE, supplies regulated 5V output to GPIO Header for Raspberry Pi and 12V Output | 
| Digital I/O | 
2x RS 232 Serial ports, 2x Wiegand Input Ports | 
| GPIO | 
5x Solid State Relay Outputs (2x Isolated, 3x Button Inputs | 
| Visual Indicators | 
Relay LED's | 
| Buzzer | 
On-Board, with connector for external |