Pololu Orangutan USB - Manual (Page 4)

Pololu Orangutan USB Programmer labeled top view
Pololu Orangutan USB Programmer labeled bottom view
3. Module Pinout and Components
USB-to-Serial Adapter Mode:
The location of the blue mode jumper
determines whether the device will
function as a programmer or a USB-to-
serial adapter. When the mode jumper
spans the two pins that are marked on the
bottom of the board with a “U”, the
computer’s RX line is connected to the pad
labeled RX and the device will function as
a basic USB-to-serial adapter. The RX and
TX pads are labeled from the computer’s
perspective, so to make use of the USB-to-
serial adapter you need to connect the
programmer’s RX pad to your target’s TX
pin (PD1 on the Orangutan/3pi) and the TX
pad to your target’s RX pin (PD0 on the
Orangutan/3pi) while in USB-to-serial
mode. These pads expect logic-level
signals (i.e. 0 V lows, 5 V highs).
Programmer Mode:
When the blue mode jumper spans the two
pins that are marked on the bottom of the
board with a “P”, the computer’s RX line is
connected
to the programming
microcontroller and the device will
function as an in-circuit AVR ISP programmer. The computer’s TX line is always connected to both the pad
labeled TX and the programming microcontroller.
Revision Number:
There are currently two versions of the Orangutan USB Programmer: PGM02A and PGM02B. The programmer’s
revision number is written along the right side of the bottom of the PC board. The newer PGM02B revision has
two key improvements over the original PGM02A: 1) it has the ability to accept firmware updates from Pololu
(see
Section 8 ) and 2) it won’t let you program your target device if that device is not powered, which can help
prevent you from accidentally damaging your Orangutan/3pi. Please take note of your programmer’s revision
number so you know which statements in this user’s guide apply to your specific programmer.
LEDs:
The green USB status LED near the mini-B connector will light when the Orangutan USB programmer is
connected to a personal computer and functioning properly as a serial port. If you have not installed the
programmer’s drivers before connecting it, this status LED will be off.
The red and green programming status LEDs near the center of the board will give you feedback when the
Orangutan USB programmer is being used in programming mode. The green LED will flash every time the
programmer receives a valid AVR ISP command packet from the personal computer to which it is connected. The
red LED will flash every time the programmer sends information over the 6-pin ISP cable to the device being
programmed. These LEDs do not do anything when the Orangutan USB programmer is in USB-to-serial mode.
Pololu Orangutan USB Programmer User's Guide © 2001–2011 Pololu Corporation
3. Module Pinout and Components Page 4 of 32