3.4 Communications lines 3 MS3PRO HARDWARE
3.3.6 Tach output
This output can be used to produce a 12 volt square wave signal. It can also trigger certain ignition modules such
as an MSD 6AL or a Ford TFI, or be used as a general purpose on/off output. When used as an on/off output, it
can sink up to 1 amp.
3.3.7 Stepper motor control output
The MS3Pro includes one stepper control output, with a maximum current of 750 mA per channel to drive a stepper
idle air control valve. However, its outputs can also be used as a tach signal or two general purpose on/off outputs.
When used as an on/off output, the device can be treated as two separate paired low / high side drivers. The A
output of either side will supply 12 volts is turned on, while the B output will supply ground a relay or solenoid.
Turning the output off reverses the pattern if the other output is on. If both outputs are off, all four outputs will not
supply any voltage or ground.
3.3.8 Digital I/O as outputs
The digital I/O pins can function as a 0-5V output. These produce a very small voltage to run digital circuitry. These
output pins will not control a relay or solenoid directly.
3.4 Communications lines
3.4.1 RS232
RS232 is an industrial strength serial connection. The RS232 connection uses an M12 circular connector with four
pins on the top of the unit. RS232 is more noise resistant than USB, and we recommend using this connection if
your laptop supports this. Do not attempt to plug the RS232 connection into any sort of 15 or 25 pin connector -
these are usually for VGA displays or joysticks. Some third party devices such as Bluetooth adapters also use the
RS232 connection.
3.4.2 USB
The MS3Pro features one USB output channel that allows it to communicate with a laptop. We recommend using
a shielded cable for best results as not all USB cables have full shielding. The MS3 Pro Ultimate uses a mini B
style connector.
3.4.3 CANbus
The CANbus wires are an automotive network that allow the MS3Pro to communicate with other CAN enabled
modules. Note that not all CAN enabled devices will communicate with the MS3Pro; CAN is a type of hardware,
and in addition to having the required hardware, the device you are attempting to connect to the MS3Pro must also
be programmed to understand the type of messages the MS3Pro sends. Devices currently or soon on the market
that can be connected to the MS3Pro include:
• MicroSquirt transmission controller
• AMP EFI CAN-EGT thermocouple interface
• AIMSport MXL, Racepak IQ3S, Race Technology Dash2Pro, and other display dashes
• Third party CAN enabled wideband O
2
sensor controllers
The MS3Pro Ultimate incorporates an M12 connector that supplies CAN connectivity, 12V constant and switched
power, and ground for use with future CAN expansion devices.
3.5 Maintenance inside the case
The MS3Pro has several parts designed to be easy to repair in the unlikely event that the user needs to service
the ECU.
AMP EFI MS3ProUltimate manual version 1.203, firmware 1.5.0, 5/23/2017 Page 29
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