Alpha MLS-485K Network Controller for Keltron
The MLS-485K from Alpha is a network controller for Keltron, required per system when using with Keltron Sdact dialer or equivalent. The Alpha MLS-485K Network Controllers allow up to 31 RS-232 serial ports (transmit only) to be connected to a receiver RS-232 port. In addition, MLS-485K eliminates RS-232 distance limitations. Ports may be located up to 4000′ apart. Normally, an RS-232 peripheral device must be located in close proximity to the host device.
MLS-485K prevents serial ports from attempting to communicate simultaneously. Flow control is accomplished using the RS-232 CTS (Clear To Send) handshaking signal. Data is converted to RS-485 format for transmission. This allows data to be sent over long distances while maintaining a high level of noise immunity. MLS-485K are connected together to form a network using simple, inexpensive wiring. Two pair, #2AWG connects all MLS-485K together. MLS-485K is packaged in Black, medium impact ABS plastic enclosures.
Key Features of Alpha MLS-485K
- Multi-Port Connectivity: Supports up to 31 RS-232 serial ports, enabling extensive network setups for increased operational efficiency.
- Extended Distance Capability: Eliminates RS-232 distance limitations with ports located up to 4000′ apart, allowing flexible device placement.
- Flow Control Management: Uses RS-232 CTS handshaking signal to prevent simultaneous communication attempts, ensuring reliable data transmission.
- Robust Data Transmission: Converts data to RS-485 format, maintaining high noise immunity over long distances.
- Simple Network Setup: Connects easily using economical wiring solutions (two pair, #2AWG), simplifying installation processes.
- Durable Enclosure: Packaged in medium impact ABS plastic to withstand various environmental conditions.
Detailed Specifications for Alpha MLS-485K
| Product Type | Network Controller |
| Model | MLS-485K |
| Supported Ports | 31 RS-232 serial ports |
| Distance Capability | Up to 4000′ between ports |
| Flow Control | RS-232 CTS handshaking signal |
| Data Format | RS-485 |
| Wiring Requirement | Two pair, #2AWG |
| Enclosure Material | Medium impact ABS plastic |



















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