B&B Electronics Mfg. Co
B&B Electronics Mfg. Co 485LDRC9 RS-232 to RS-422/485 serial adapter
Optically isolated RS-232 to RS-422/485 serial converter with DB-9 female and terminal-block connections, 2000 V isolation, 500 W surge suppression, 1.2 km range, 10–30 VDC power.
- Changer TypeSerial
- SpecificationsConnector on First End:1 x 9-pin DB-9 Female RS-232 Serial C
- Extends data up to 4000 ft / 1.2 km for long-distance industrial links
- 2000 V optical isolation with 500 W surge suppression protects connected equipment
- Automatic send data control removes need for external handshake software
- Switchable 120 Ω termination simplifies bus configuration
- Wide 10–30 VDC input and DIN-rail mount fit standard 35 mm rails
Industrial serial converter
The B&B Electronics 485LDRC9 converts RS-232 signals to RS-422 or RS-485 for industrial automation and long-distance data links. It targets engineers and integrators who need reliable serial communication in harsh environments. The unit mounts on standard 35 mm DIN rail and accepts 10 to 30 VDC external power. It is not for users who need a simple gender changer or a USB-to-serial adapter.
Optically isolated 2000V data lines
The single specification that decides fit is the 2000V optical isolation on the data lines with 500W surge suppression. This protection level determines whether the adapter survives ground loops, voltage spikes and noisy electrical cabinets. Without this rating the converter would not suit critical industrial sites where equipment safety is mandatory.
Terminal block and automatic send control
The terminal block on the RS-422/485 side enables secure screw-down wiring for multi-drop networks up to 4000 ft or 1.2 km. Switchable 120 ohm termination matches line impedance without extra parts. Automatic Send Data Control removes the need for software handshaking, simplifying Modbus ASCII and RTU deployments.
Highlights
- Extends data up to 4000 ft / 1.2 km for long-distance industrial links
- 2000 V optical isolation with 500 W surge suppression protects connected equipment
- Automatic send data control removes need for external handshake software
- Switchable 120 Ω termination simplifies bus configuration
- Wide 10–30 VDC input and DIN-rail mount fit standard 35 mm rails
Specifications
| Brand | B&B |
|---|---|
| Model | 485LDRC9 |
| Changer Type | Serial |
| Specifications | Connector on First End:1 x 9-pin DB-9 Female RS-232 Serial Connector on Second End:1 x Terminal Block - RS-422/485 Serial |
| Shipping weight | 0.91 kg |
| Package size | 158 × 148 × 23 mm |
Questions about this item
How far can this converter reliably send data once installed in a cabinet?
The optically isolated RS-232 to RS-422/485 converter extends data up to 1.2 km or 4000 ft over twisted-pair wiring.
What does the 120 Ω termination switch actually control on the RS-422/485 bus?
It connects or disconnects a 120 Ω resistor across the terminal-block data lines to match the cable impedance and prevent signal reflections.
What rail width does the DIN clip on the enclosure accept?
The built-in DIN rail mount is designed to snap onto a standard 35 mm rail.
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