Datalink Corporation
DataLink CD485,RS485 Series RS232C – RS485 Converter
Manufacturer: DataLink
Model: CD485,RS485
Features
- The [CD485, RS485] series is a compact and lightweight RS232C to RS485 converter.
- It converts RS232C signals to RS485, extending the communication range of RS232C devices up to 1200 meters—overcoming the typical 15-meter distance limitation of RS232C communication.
Specifications
| Model | RS485/N | RS485/PN | RS485/PV | CD485/V series (also ROHS) | CD485 series (also ROHS) | RS485/P |
|---|---|---|---|---|---|---|
| Maximum communication speed | 115.2Kbps | 38.4Kbps | 115.2Kbps | 38.4Kbps | 38.4Kbps | 115.2Kbps |
| Maximum number of connections | 32 units | 32 units | 32 units | 32 units | 32 units | 32 units |
| External dimensions (mm) | W33/H16.5/D63.5 | W33/H16/D63 | W33/H16/D63 | W32/H16.5/D63.5 | W53/H19/D64 | W53/H19/D64 |
| Weight (g) | Approximately 25g | Approximately 24g | Approximately 24g | Approximately 25g | Approximately 45g | Approximately 45g |
| Maximum Transmission Distance | – | – | 1200m | 1200m | 1200m | 1200m |
| Current consumption (maximum at 5V) | 25mA or less /5V | 25mA or less /5V | 75mA or less /5V | 90mA or less /5V | 90mA or less /5V | 70mA or less /5V |
| CD signal monitoring | – | – | – | can be | can be | – |
| Insulation Function | – | can be | can be | – | can be | can be |
| RS232C side | Dsub9 pin female (DCE) | Dsub9 pin female (DCE) | Dsub9 pin female (DCE) | Dsub9 pin female (DCE) | Dsub25 pin male (DCE) | Dsub25 pin male (DCE) |
| RS485 side | 5P small terminal block | 6P small terminal block | 6P small terminal block | 5P small terminal block | 5P terminal block | 5P terminal block |
| power supply | No power supply (powered from RS232C signal line) or AC adapter (sold separately) | No power supply (power taken from RS232C signal line) | AC adapter included as standard | AC adapter included as standard | Power supply from pins 9/14 or an optional AC adapter | External power supply (AC adapter) or power supply from pins 9/14 |
| Termination Resistor | Can be set on terminal block | Can be set on terminal block | Can be set on terminal block | CD485/VT (390Ω) CD485/VF (390Ω) | Can be set on terminal block | Can be set on terminal block |
| Noise Countermeasures | Surge absorber | Surge absorber | Surge absorber | Surge absorber | Surge absorber | Surge absorber |
◆List of RS232C⇔RS485 converters
●RS485/N
- No power supply needed (uses power from RS232C signal line)
- Optional AC adapter available
- RS232C connector: D-sub 9-pin female (DCE configuration)
- RS485 connector: 5-pin terminal block (insertion screw type)
| RS232C side Dsub9 female (DCE arrangement) | RS485 side 5P small terminal block | No power supply | Maximum communication speed 115.2Kbps | – | – | – | – |
●RS485/PN
- No power supply required (powered via RS232C signal line)
- RS232C connector: D-sub 9-pin female (DCE arrangement)
- RS485 connector: 6-pin terminal block (screw insertion type)
| RS232C side Dsub9 female (DCE arrangement) | RS485 side 6P small terminal block | No power supply | Maximum communication speed 38.4Kbps | – | – | – | Insulation Function |
●RS485/PV
- External power supply required (AC adapter included as standard)
- RS232C connector: D-sub 9-pin female (DCE arrangement)
- RS485 connector: 6-pin terminal block (screw-insertion type)
| RS232C side Dsub9 female (DCE arrangement) | RS485 side 6P small terminal block | Power supply AC adapter | Maximum communication speed 115.2Kbps | Maximum transmission distance : 1200m | – | – | Insulation Function |
●CD485/V Series
- External power supply required (AC adapter)
- RS232C connector: D-sub 9-pin female (DCE arrangement)
- RS485 connector: 5-pin terminal block (screw-insertion type)
| RS232C side Dsub9 female (DCE arrangement) | RS485 side 5P small terminal block | Power supply AC adapter | Maximum communication speed 38.4Kbps | Maximum transmission distance : 1200m | CD signal monitoring | – | – |
●CD485/V-RoHS
- External power supply required (AC adapter)
- RS232C connector: D-sub 9-pin female (DCE arrangement)
- RS485 connector: 5-pin terminal block (screw-insertion type)
| RS232C side Dsub9 female (DCE arrangement) | RS485 side 5P small terminal block | Power supply AC adapter | Maximum communication speed 38.4Kbps | Maximum transmission distance : 1200m | CD signal monitoring | ROHS | – |
●CD485
- External power supply (AC adapter sold separately) or powered via pins 9/14
- RS232C connector: D-sub 25-pin male (DCE arrangement)
- RS485 connector: 5-pin terminal block (M3 screw type)
| RS232C side Dsub25 male (DCE arrangement) | RS485 side 5P terminal block | Power supply RS232C pins 9/14 | Maximum communication speed 38.4Kbps | Maximum transmission distance : 1200m | CD signal monitoring | – | – |
●CD485-RoHS
- Power supply: External (AC adapter sold separately) or via RS232C pins 9/14
- RS232C connector: D-sub 25-pin male (DCE arrangement)
- RS485 connector: 5-pin terminal block (M3 screw type)
| RS232C side Dsub25 male (DCE arrangement) | RS485 side 5P terminal block | Power supply RS232C pins 9/14 | Maximum communication speed 38.4Kbps | Maximum transmission distance : 1200m | CD signal monitoring | ROHS | – |
●RS485/P
- Power supply: External (AC adapter) or via RS232C pins 9/14
- RS232C connector: D-sub 25-pin male (DCE arrangement)
- RS485 connector: 5-pin terminal block (M3 screw type)
| RS232C side Dsub25 male (DCE arrangement) | RS485 side 5P terminal block | Power supply RS232C pins 9/14 | Maximum communication speed 115.2Kbps | – | – | – | Insulation Function |
●CD485-FA
- Noise-resistant product.
- Converter includes lightning surge and static electricity protection.
- RS232C connector: D-sub 9-pin male.
- Max communication speed: 115.2 Kbps.
- Max communication distance: 1200 meters.
- DIN rail mountable.
◆Connection configuration
1.RS232C devices communicate with RS485 devices using a converter.
2. Example of multiple connection of CD485 converters with CD signal collision detection function.
3. Examples of connecting RS485 converters with various power supply modes
◆Product Summary
- Power Supply Options
RS485/N and RS485/PN draw power from the RS232C signal line.
RS485P, CD485, and CD485-ROHS are powered via an AC adapter or RS232C pins 9 and 14 (requires RTS or DTR output). - Electrical Isolation
RS485/PN, RS485/PV, and RS485P provide optical isolation via photocouplers to prevent noise propagation. - Communication System
CD485 and CD485/V use a 2-wire RS485 bus system suitable for low-cost CSMA/CD systems. - Surge Protection
Built-in high-speed surge-absorbing silicon elements protect against voltage spikes. - Performance Specs
Maximum communication distance: 1200 meters
Maximum speed: 115.2 Kbps - Connector Mounting
Dsub25P (M2.6 × 6 male screw), Dsub9P (#4-40 × 13 UNC screw) - Termination Options (CD485/V Series)
CD485/VN: No termination/fail-safe; mid-bus use
CD485/VT: Termination resistor (390 Ω)
CD485/VF: Termination resistor (390 Ω) + fail-safe circuit (1K Ω pull-up/down)
