<h2>Overview</h2>
<p>The <strong>Black Box TL074A-R3</strong> is a 6-port passive RS-232 splitter designed to share a single RS-232-C DCE device (such as a modem) with multiple RS-232-C DTE devices (such as terminals or computers). This passive splitter requires no power, configuration, or special software—it works transparently with both synchronous and asynchronous protocols at any baud rate. </p>
<h2>Key Features</h2>
<ul>
<li><strong>6-Port Distribution:</strong> <cite index=”3-1″>Allows an RS-232-C DCE device, such as a modem, to interface with up to six RS-232-C DTE devices, such as terminals.</cite></li>
<li><strong>No Configuration Required:</strong> <cite index=”3-7,3-8″>No jumpers and/or switches are located on the Modem Splitter. No special cables are needed.</cite></li>
<li><strong>Protocol and Speed Transparent:</strong> <cite index=”3-10″>Works equally well in sync and async environments</cite> at any baud rate.</li>
<li><strong>Included Accessories:</strong> <cite index=”3-9″>Includes a 6-ft. DB25 male/DB25 female extension cable and a serial DB9 female/DB25 male AT adapter.</cite></li>
</ul>
<h2>Technical Specifications</h2>
<p></p>
<ul>
<li><strong>Connector Type:</strong> DB25 Female (MASTER) / DB25 Female (6 PORT connectors)</li>
<li><strong>Number of Ports:</strong> 6 Ports</li>
<li><strong>Passive Design:</strong> No power supply required</li>
<li><strong>Master Port Configuration:</strong> <cite index=”3-2″>MASTER port is configured DTE and PORTS 1-6 are configured DCE.</cite></li>
<li><strong>Signal Path:</strong> <cite index=”3-11″>Signals present on the MASTER connector at pins 1, 3, 5, 6, 7, 8, 15, and 17 are sent to the corresponding pins on each of the PORT connectors.</cite></li>
<li><strong>Included Cable:</strong> 6-ft. DB25 male/DB25 female extension cable</li>
<li><strong>Included Adapter:</strong> Serial DB9 Female/DB25 Male AT Adapter</li>
</ul>
<h2>Typical Applications</h2>
<p>The TL074A-R3 is ideal for legacy serial communication environments where a single modem or data communications device must serve multiple terminals, workstations, or data acquisition systems. Common applications include:</p>
<ul>
<li>Industrial control systems and PLCs requiring shared serial communication</li>
<li>Legacy laboratory and test equipment interfacing</li>
<li>Multi-terminal modem sharing for dial-up connections</li>
<li>Serial port expansion in embedded systems and kiosks</li>
<li>Data logging and monitoring applications</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>Any RS-232-C DCE device (modem, serial converter, data line terminator)</li>
<li>Any RS-232-C DTE device (terminal, computer, industrial controller)</li>
<li>Extended-distance RS-232 data cables with DB25 connectors</li>
<li>Synchronous and asynchronous serial protocols</li>
<li>All standard baud rates (300–115,200 bps and higher)</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<ul>
<li>Black Box TL074A-R4 (same 6-port function; verify connector specifications)</li>
<li>Legacy multi-port RS-232 passive splitters</li>
</ul>
<h3>Works With</h3>
<ul>
<li>RS-232 serial communication protocol</li>
<li>Standard serial ports on legacy and modern systems (via USB-to-RS232 adapters)</li>
<li>Industrial serial devices and fieldbuses that support RS-232 interfaces</li>
</ul>
