Pacific Research Solutions RI-1 User Manual
Page 18
Pacific Research Solutions
RI-1 and PE-1 User Manual
Page 12
DIGITAL OUTPUTS (Pins 8 and 9)
The RI-1 has two digital outputs on board and is currently expandable up to ten, whose states can be modified by
S-Commands. Each of the two outputs can be individually commanded or forced into the high or low logic state. These
outputs are open drain FET transistors and can sink up to 120ma each. There are no pull-up resistors on these outputs. If pull-
up resistors are needed, they must be provided by the user supplied interface. These outputs can sink current from a voltage
sources as high as 24 volts DC. Using S-Commands (or macros that are composed of S-Commands), each output may be
turned on or off. See Sections 11 S-Command 46 additional information on programming these outputs. These outputs are
located on J1 pins 8 and 9. See the connector diagram on the previous page.
+5V Output (Pins 1)
This is a low current +5V supply output. This output can be used to power an interface circuit external to the controller. Do
not draw more then 25mA from this output.
SERIAL DATA (Pins 18 through 20)
These signals are reserved for digital output expansion. This feature is to be added at a later time.
RADIO DATA (Pins 10 through 14)
These signals are reserved for serial communication to various radios. This feature is to be added at a later time.
RS-232 DATA (Pins 22 through 25)
These signals are used to communicate to various radios and EchoLink. See linking section for more details.