# DLDR2 Digirule 2U Download Utility User Manual 8 January 2021 --- ## Introduction DLDR2 is a utility designed to make it easier to download programs from a Mac to the Digirule 2U. Specifically, its purpose is to work around a difficulty with configuring the serial port from the Mac command line. This manual should be considered a supplement to the *Digirule 2U User Manual*. --- ## Getting Started Before running the utility, you need to know the name of the USB device on your Mac to which the Digirule 2U is connected. `ls /dev/tty.*` Example device name: `/dev/tty.usbserial-DM038QQY` --- ## Running the Utility The general syntax to invoke the utility is: `dldr2 <file device` This example assumes that the utility resides in the current working directory. ``` User@imac:~ $ ./dldr2 < program.hex /dev/tty.usbserial-DM038QQY ``` --- <center> <img "height=50" src="https://i.imgur.com/WSqeSrI.png"> </center>