TCP2Serial 1.4 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This software for Mac OS X is a product of Pignology, LLC.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The following version: 1.2 is the most frequently downloaded one by the program users. The application relates to Internet & Network Tools. You can run this application on Mac OS X 10.7 or later.
From the developer:
TCP2Serial is a utility application to proxy traffic to/from a serial port over the network. For example, you run TCP2Serial on your mac with a serial port attached and connected to a serial device. Then, you can telnet to the host running TCP2Serial on the port configured in the app and anything sent via the telnet session is sent out the serial port, anything received on the serial port is echoed back across the telnet session.
You may want to check out more software for Mac, such as AquaEthereal or tn3270, which might be related to TCP2Serial.