Black Box Async RS-232 DB25 Code Operated Switch - 4-Port - 5 x Serial Port - Automatic - TAA Compliant SW853A-R3

DTE/DCE-selectable, so you can switch between a modem and a printer. There''s no need for crossover cables. Safe for use with laser printers. Includes a hardware-handshake lead in each direction for added control. No unintended triggering - no matter what data you''re sending. Also available with eight ports. The integrated Code-Operated Switch, RS-232, 4-Port is an asynchronous RS-232 switch with four subordinate ports and one master port that enables you to switch serial devices with codes. There''s no unintended triggering with this switch - no matter what data you''re sending. With an internal DIP switch, you select the arming character to use as a trigger. You can set each port individually as DTE or DCE. That''s handy for switching among modems and printers. And your connection is secure. Once a connection is made, other ports are locked out. (Remember that all ports need to be set to operate with identical speeds and word structures.) For extra control, there''s a hardware-handshake lead in each direction in case a device (or the computer) needs it. The upgraded switch platform has several new features, including: Integrated transceiver loopback for faster fault isolation. Enhanced front-panel LED display to provide a visual indication of more switch operations, including the status of data activity, switch time, port lockout, and control handshake. Power-on initialization that includes port selection default. Onboard programmable PROM to provide function updates and maintenance via active serial and JTAG connections.

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