Sealevel launches Ethernet-to-serial device servers

Sealevel Systems Inc. has expanded its SeaLink serial device drivers by introducing low-cost one-port and two-port models.


Sealevel Systems Inc . has expanded its SeaLink serial device drivers by introducing low-cost one-port and two-port models. Offering RS-232, RS-422, and RS-485 communications, the company says that SeaLink devices are the easiest way to connect legacy serial devices directly to an Ethernet network.

Based on a powerful embedded microprocessor, SeaLink drivers can communicate at sustained rates up to 230 Kbps. RS-232 models implement all modem control signals for maximum compatibility with a variety of peripherals, and all SeaLink devices include a watchdog timer circuit for fault tolerance. Flexible table-mount or DIN rail-mounting options allow easy installation close to target I/O devices.

Sealevel adds that its SeaLink devices use industry-standard RFC 2217 TCP/IP protocol for maximizing compatibility with the widest range of applications and networked serial devices. Included software works under a variety of operating systems, including Windows 98/ME/NT/2000/XP and Linux. Standard serial operating calls are transparently redirected to the SeaLink, which operates as a virtual COM port, which not only guarantees compatibility with most serial devices, but also enables backward compatibility with existing code. Alternatively, a Raw Data Socket mode is supported, eliminating the need for a driver.

SeaLink products are available as multi-interface RS-232/422/485, RS-422/485, or RS-232 only. Standard operating temperature range is 0 °C to 70 °C and an extended temperature range of–40 °C to +85 °C is optional.

—Jim Montague, news editor, Control Engineering,

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