I was trying "Serial/Direct" but that never worked. This last option is what threw me for a little.
Give the connection a title, keep the "Connect to" option blank, set the reconnect option to "Plain connection (no retry if failed)", set the emulation to VT100, and set the Device to "Serial/Modem". Go to Host Directory in Zoc and click on New. In my case, I am connecting to a Cisco Video Communications Server (VCS) so, some of the configuration parameters I show in the following screenshots are specific to the VCS.
If you use Zoc, then here is the procedure for using the IOGear (or I suppose any device that uses the PL-2303 driver). It is a great app, but that is a blog entry for another day. I use Zoc Pro as a terminal application on my MBP and iMac. I didn't bother modifying the configuration, just click on Apply.
In my case I saw a modem driver named "PL2303-". In Network Preferences, you should see the new network connection. Neither of these methods worked for me, just an FYI.
NOTE: The Prolific install guide (I found it online) said that you should be able to see the USB serial interface using System Profile or from the terminal using: ls /dev/tty.usbserial*. If you see this, click on "Network Preferences". When I connected the dongle, I received a prompt from OS X, which stated that a new Network Interface was detected.
I did a few more searches, focusing on software download sites and I found a link that worked: Now, at this point I have spent an hour or two digging around and I am thinking I have old stuff that may need to be recycled. Obviously, those threads are dated because that link didn't work either.
Mac OS X has been supported from version 6. Support for OS/2 was discontinued with the release of version 5.
ZOC released version 3.11 in January 1999. In 1997 it was selected as runner-up in the OS/2 e-Zine! Readers' Choice Awards. ZOC was first released for OS/2 in October 1993 (v0.95) and for Windows in November 1996 (v3.02). Emtec produces two other associated but independent telecommunications programmes for use over TCP/IP, modem, ISDN etc.: PyroTrans, an FTP package including client and server, and PyroBatchFTP, a programmable FTP tool. Price as of 2018 was about US$80, with a free evaluation period of 30 days ZOC can be downloaded for evaluation from EmTec or several shareware distribution sites. ZOC is commercial software developed by Markus Schmidt of EmTec Innovative Software in Germany, a firm which produces software for various aspects of communications via telephone, PC, ISDN and the like.
It supports full keyboard remapping, scripting in REXX and other languages, and support for named pipes. Its terminal emulator supports Xterm emulation with full colors, meta-keys and local printing, VT102, VT220 and several types of ANSI as well as Wyse, TVI, TN3270, and Sun's CDE. ZOC is a popular computer-based terminal emulator and Telnet software client for the Microsoft Windows and Apple Macintosh macOS operating systems that supports telnet, modem, SSH 1 and 2, ISDN, serial, TAPI, Rlogin and other means of communication.