| Parameter | Value | | :--- | :--- | | | HW-044 | | Relay Voltage | 5V DC (Nominal) | | Control Signal | 3.3V ~ 5V TTL/CMOS compatible | | Trigger Mode | Low Level Trigger (Active Low) | | Max Load (AC) | 250V AC at 10A | | Max Load (DC) | 30V DC at 10A | | Isolation | Optocoupler (PC817 typically used) | | Contact Type | SPDT (Single Pole Double Throw) | | Quiescent Current | ~5mA | | Operating Current | ~70mA (when relay is engaged) |
The HW-044 datasheet highlights its ability to bridge the gap between high-voltage RS232 signals (up to ±25V) and low-voltage TTL signals (0-5V). Specification MAX3232 (Texas Instruments or similar) Operating Voltage 3.0V – 5.5V DC Baud Rate Support Up to 120 kbps (standard) or 250 kbps TTL Connector 4-pin header (VCC, GND, TX, RX) RS232 Connector Female DB9 (Standard Serial Port) Operating Temp -40°C to +85°C Dimensions ~31mm x 32mm HW-044 Pinout and Interface hw-044 datasheet
Updating firmware on set-top boxes, DVD players, or vehicle diagnostics (OBD) equipment. | Parameter | Value | | :--- |
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