DELTEC DELCOM-3222 RS-485/232C

Technical Specifications

• Interface 1 (RS-232C): DB9 male connector, full-duplex TTL level standard, EIA/TIA-232 compliant
• Interface 2 (RS-485): 2-wire half-duplex differential bus terminal block, EIA/TIA-485 standard
• Supported Baud Rate Range: 300 bps ~ 115200 bps, auto-adaptive baud rate identification
• Isolation Voltage: 2500 VDC optoelectronic isolation between RS-232 and RS-485 circuits
• Power Supply Input: 24 VDC industrial standard power, operating voltage tolerance 18 VDC ~ 30 VDC
• Operating Temperature Range: -20 °C ~ +60 °C
• Storage Temperature Range: -40 °C ~ +85 °C
• Relative Humidity Resistance: 5% RH ~ 95% RH, non-condensing
• Maximum Transmission Distance: 1200 m at 9600 bps (RS-485 side)
• Maximum Node Capacity: 32 slave devices on single RS-485 bus segment

Functional Features

1. Hardware automatic direction control for RS-485 half-duplex transmission without external DI/DO trigger signal
2. Built-in transient voltage suppression TVS components for lightning surge protection on bus lines
3. Isolated power circuit eliminates ground loop interference between field equipment and control cabinets
4. LED status indicators: power supply indicator, RS232 transmit/receive data indicator, RS485 bus activity indicator
5. Terminal block short-circuit protection with automatic recovery circuit

Performance Parameters

• Signal conversion delay: ≤ 1 μs
• Galvanic isolation impedance: ≥ 10 GΩ
• Surge withstand capacity: ± 15 kV ESD contact discharge, ± 2 kV EFT burst immunity
• Power consumption: 2.8 W maximum full-load operation

Material Composition

• Housing: Flame-retardant ABS plastic, UL94-V0 fire rating
• Internal circuit substrate: FR4 glass fiber printed circuit board
• Connection terminals: Copper alloy with nickel plating, anti-oxidation coating
• Internal isolation components: High-speed optocoupler silicon chip

Structural Characteristics

• DIN rail mounting form factor, standard 35 mm top-hat rail compatible
• Compact width: 22.5 mm single module width
• Front panel integrated DB9 port and screw terminal wiring area
• Sealed dust-proof front casing with ventilation micro-slots for heat dissipation

Working Principle

Advantage Highlights

• Complete galvanic isolation eliminates industrial ground loop noise interference
• Wide-range industrial DC power input adapts to cabinet power fluctuation
• Auto-direction control removes external wiring control requirement for RS485 bus
• High-level EMC electromagnetic compatibility meets CE industrial automation standard
• Compact DIN rail structure saves control cabinet internal installation space

Applicable Industries

Installation Requirements

1. Mount module vertically on standard 35 mm DIN top-hat rail inside sealed electrical control cabinet
2. Separate power cable and RS485 bus wiring from high-power AC drive cables with minimum 10 cm clearance
3. Install 120 Ω termination resistor at two extreme endpoints of RS485 bus cable
4. Connect module ground terminal to cabinet protective earth copper bar

Operation Precautions

1. Strictly prohibit reverse connection of 24 VDC power positive and negative terminals
2. Do not operate the module in environments with condensed water, corrosive gas or conductive dust
3. Cut off power supply before plugging/unplugging RS232 DB9 connector to avoid signal chip burnout
4. Limit total bus node quantity to maximum 32 devices to prevent bus load overload
5. Use shielded twisted pair cable exclusively for RS485 bus wiring, connect shield layer to single-point earth