What is the best ProSoft solution for communicating to devices that use the Siemens USS ASCII-based protocol?

MVI56E-GSC or MVI56E-LDM In-Chassis modules are recommended forcommunicating with any ASCII based protocol from a ControlLogix .  Thisassumes knowledge of protocol properties such as command and responsestructures, baud rate, data bits, parity, and other details of theprotocol are available to the engineers who are tasked to develop therequired application.