Three-Interface Conversion
Connects an RS232 host to equipment using RS422 or RS485 balanced differential signaling.
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DT-9003
Passive RS232 to RS422/RS485 Converter
Port-powered conversion between RS232 hosts and RS422 or RS485 equipment without routine external power.
Connect RS232 hosts to RS422 or RS485 serial equipment at 300 bps to 115.2 Kbps, with source-specified RS485 transmission up to 1200 metres.
Hover to zoomDTECH DT-9003 passive RS232 to RS422 and RS485 converter on a pure white background
ConversionRS232 ↔ RS422/485Automatic data direction
Baud Rate300–115200 bpsSource-specified range
RS485 DistanceUp to 1200 mRS232 side up to 5 m
Working ModeFull / half duplexAutomatic selection
Environment−20°C to 70°C5%–95% RH
Product Overview
A practical path for bringing installed serial equipment into modern industrial data networks.
The DT-9003 converts an RS232 host signal for RS422 or RS485 serial equipment. Its official manual identifies a DB9 female connector on the RS232 side and a DB9 male connector with a six-position terminal board on the RS422/RS485 side.
The converter is normally powered from the RS232 port and automatically controls data direction without jumper settings. The source specifies 300 to 115200 bps, up to 1200 metres on the RS485 side and up to 5 metres on the RS232 side.
115.2 Kbpsmaximum source rate
Covers common industrial serial baud rates.
1200 mRS485-side distance
Source-specified maximum transmission reach.
5 mRS232-side distance
Documented host-side cable limit.
64 × 33 × 17 mmenclosure size
Compact in-line adapter dimensions.
Key Features
Core capabilities selected for reliable integration, flexible deployment and efficient maintenance.
Automatic Duplex Selection
Supports asynchronous full-duplex and half-duplex transmission without jumper settings.
Port-Powered Operation
Normally operates from the RS232 interface without an external power supply.
Long-Distance RS485 Link
Supports source-specified RS485 transmission up to 1200 metres.
Wide Baud-Rate Range
Supports source-specified serial rates from 300 to 115200 bps.
Compact Environmental Range
Specified for −20°C to 70°C and 5% to 95% relative humidity.
System / Network Architecture
See how this product fits into an industrial serial communication network.
RS232 hostComputer, controller or serial workstation
Serial data
Protected branches
RS422 / RS485 equipmentFull-duplex or half-duplex industrial serial link
Technical Specifications
Verified configuration details for engineering review and product selection.
Communication
- Model
- DT-9003
- Product type
- Passive RS232 to RS422/RS485 converter
- Interface compatibility
- EIA/TIA RS-232C, RS-422 and RS-485
- Working modes
- Asynchronous full duplex and half duplex; automatic selection
- Transmission rate
- 300–115200 bps
- Transmission medium
- Twisted-pair or shielded cable
- RS485 transmission distance
- Up to 1200 m
- RS232 transmission distance
- Up to 5 m
Interfaces and Power
- RS232 connector
- DB9 female
- RS422/RS485 connector
- DB9 male with 6-position terminal board
- Normal power method
- RS232 port powered; no routine external supply required
- Optional external supply
- 9V through the VCC terminal when required
- Recommended termination
- 120Ω, 1/4W at the line terminal when required by the installation
Mechanical and Environmental
- Dimensions
- 64 × 33 × 17 mm
- Operating temperature
- −20°C to 70°C
- Relative humidity
- 5% to 95%
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Frequently Asked Questions
Verified answers for product selection and project planning.
Which serial interfaces does the DT-9003 support?
The DT-9003 converts an RS232 host interface for connection to RS422 or RS485 equipment.
Does the DT-9003 require an external power supply?
Normally no. The official manual states that it is powered from the RS232 port. A 9V external supply may be connected through the VCC terminal when an installation requires it.
What baud-rate range does the DT-9003 support?
The official product page and manual specify 300 to 115200 bps.
How far can the DT-9003 transmit?
The source specifies up to 1200 metres on the RS485 side and up to 5 metres on the RS232 side.
Need Help Selecting the Right Product?
Share your device interfaces, network environment and project requirements with the DTECH industrial communication team.