User's Guide

USER GUIDE: UBS-200L LF DESKTOP READER
April 4, 2019
Unified Information Devices | Chapter 3 – Operating and Configuring the UBS-200L
14
Chapter 3 – Operating and Configuring the UBS-200L
This chapter describes the protocol for communicating with and operating the UBS-200L over the virtual
serial port. These commands can easily be issued using properly configured terminal software, as
described in Chapter 2 – Getting Started with the UBS-200L. These commands can also be
automatically issued, and the responses interpreted by software, such as UI Devices pi Suite, or third-
party software as described in Appendix 3 – Connecting to Third-Party Systems.
Sending Commands
General UBS-200L commands consist of two or three characters, and may be followed by a parameter
value. The command is than terminated by a <CR>. (Carriage Return) Although upper-case letters are
used in all examples herein, the commands are NOT case sensitive.
To issue a command without a parameter value, type the command into a terminal window, and then
press <ENTER>.
To issue a command with a parameter value, type the command followed by a space, followed by the
parameter value. Then press <ENTER>.
Figure 8. Some UBS-200L Commands and Responses.
UBS-200L Response
The UBS-200L responds to commands by performing the desired action, and sending any associated
data back to the host over the serial port. If a parameter is changed, the UBS-200L responds with the
new parameter. By default, the response is terminated with a <CR> character.
Get Module Firmware Version “VER”
In the above example, the “VER” command requests the firmware version from the LF Module, and the
Module responds with its current firmware version.
Checking a Parameter Value
If a command that typically includes a parameter is sent WITHOUT the accompanying parameter, the
UBS-200L returns the current status of that parameter.