Bidirectional Serial Conversion
Transfers data between RS232 and RS485 equipment in either direction.
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DT-9004
Industrial Passive RS232 to RS485 Converter
Bidirectional RS232 and RS485 conversion for connecting computers and industrial serial equipment across longer cable runs.
Convert between RS232 and RS485 at up to 115.2 Kbps, with a source-specified RS485 transmission distance of less than 1200 metres.
Hover to zoomDTECH DT-9004 passive RS232 to RS485 converter with terminal adapter on a pure white background
ConversionRS232 ↔ RS485Bidirectional data
Baud Rate300–115200 bpsSource-specified range
RS485 Distance<1200 mRS232 side within 15 m
Environment−20°C to 70°C5%–95% RH
ProtectionTVSLightning-protection feature
Product Overview
A practical path for bringing installed serial equipment into modern industrial data networks.
The DT-9004 provides bidirectional conversion between RS232 and RS485 serial interfaces for linking a computer or host to compatible field equipment.
The official legacy source specifies a 300 to 115200 bps transmission range, less than 1200 metres on the RS485 side and within 15 metres on the RS232 side. A data indicator and built-in TVS protection support installation and fault observation.
115.2 Kbpsmaximum source rate
Covers common industrial serial baud rates.
<1200 mRS485-side distance
Source-specified cable reach for distributed equipment.
15 mRS232-side limit
Documented host-side transmission distance.
−20°C to 70°Coperating range
Specified operating-environment temperature.
Key Features
Core capabilities selected for reliable integration, flexible deployment and efficient maintenance.
Wide Baud-Rate Range
Supports source-specified serial rates from 300 to 115200 bps.
Long-Distance RS485 Link
Supports less than 1200 metres on the RS485 side under the legacy source specification.
Data Activity Indication
An onboard data indicator helps installers observe communication activity.
TVS Protection
The official source identifies a built-in TVS protection device for the serial link.
Industrial Environment 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 or serial controller
Serial data
Protected branches
RS485 equipmentIndustrial serial device or multidrop link
Technical Specifications
Verified configuration details for engineering review and product selection.
Communication
- Model
- DT-9004
- Product type
- Passive RS232 to RS485 converter with indicator
- Interface compatibility
- RS232 and RS485 standards
- Data direction
- Bidirectional RS232 / RS485 conversion
- Transmission rate
- 300–115200 bps
- RS485 transmission distance
- Less than 1200 m
- RS232 transmission distance
- Within 15 m
Protection and Indication
- Isolation
- Non-photoelectric isolation design
- Protection
- Built-in TVS protection device
- Indicator
- Data activity indicator
Environmental
- Operating temperature
- −20°C to 70°C
- Relative humidity
- 5% to 95%
- Warranty
- 1 year
Related Products
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Frequently Asked Questions
Verified answers for product selection and project planning.
Which serial interfaces does the DT-9004 convert?
The DT-9004 provides bidirectional conversion between RS232 and RS485 interfaces.
What baud-rate range does the DT-9004 support?
The official legacy product page specifies communication from 300 to 115200 bps.
How far can the DT-9004 transmit?
The source specifies less than 1200 metres on the RS485 side and within 15 metres on the RS232 side.
Is the DT-9004 photoelectrically isolated?
No. The official product description identifies it as a non-photoelectric-isolation converter with built-in TVS protection.
Need Help Selecting the Right Product?
Share your device interfaces, network environment and project requirements with the DTECH industrial communication team.