The TacServe® COM Port Server

Make a modem server from your own Windows-based server and modems,
with enterprise-class features and administration, scalable to multiple T1/E1's.

Site License
TC4RS4 buy online



30-day Free Trial

Free tech support

Using TacServe

TacServe Product Tour

Tech Details

TacServe User Guide

Tech Notes

Encryption Option

Share modems on a Windows server over TCP/IP network
TacServe includes the DialOut/EZ Redirector
You add virtual COM ports on the application computer, using the DialOut/EZ Control Panel. You configure these virtual COM ports to use the Windows-based server that runs the TacServe software.
Your application uses DialOut/EZ virtual COM ports instead of local physical COM ports. If your application uses Windows modem devices, you can create them on DialOut/EZ virtual COM ports.
Your application opens, reads and writes virtual COM ports using the standard COM port API.
The DialOut/EZ Redirector automatically makes a TCP/IP connection to TacServe and relays the virtual COM port data stream and control actions.
On the Windows-based PC running TacServe
TacServe receives a TCP/IP connection from the DialOut/EZ redirector when a virtual COM port is opened.
The TacServe COM Port Server automatically allocates an available modem for each DialOut/EZ connection, using your settings in the TacServe Control Panel.
TacServe converts the data stream and control signals and relays them to the modem.
The modem initiates a modem call on the PSTN. When building this machine, you add modem boards with a total capacity for your application needs. For servers with more than 8 modems, digital modems and PRI (T1/E1) lines are commonly used.


The TacServe COM Port Server — Version 4.9.12

Extensive Platform Support


Windows 10/8/7/Vista/XP/2012/2008/2003/2000
Terminal Services, Citrix Metaframe
Native and virtual platforms, including Virtual Server and VMware
32-bit or 64-bit version automatically installs

Scalable, Fast, Flexible


Up to 4,096 modems for large applications
Always available, user login not required
Both outbound and inbound connections

Creates a Full-featured Modem Server


Makes any local modem or serial port available to client redirectors
Works with all modems that are available on local COM ports
Supports COM Port Control Protocol (RFC 2217)
Does not use proprietary TCP/IP protocols
Includes unlimited site license for DialOut/EZ Redirector
Port groups, each with own access controls
MMC-based user interface with remote administration
Real-time activity display
Call and event logs available in database via ODBC



Rich set of features for authentication, authorization, access controls
Rule-based dialing controls with pattern matching and accept/deny
Supports SSL/TLS connections using OpenSSL
Settings and trace logs can be restricted to Administrators