PICO-IO8R is an RP2040 I/O board with four digital inputs, four relay outputs, and RS-232C and RS-485 ports. Its power input range is DC 12 to 24 V.

PICO-IO8R board with USB, RS-232C and RS-485 ports and lower I/O terminals

Ratings and operating conditions

ItemSpecification
ModelPICO-IO8R
CPURP2040
Nominal power inputDC 24 V
Power input rangeDC 12 to 24 V
Digital inputs4 points
Digital outputs4 relay contacts
Input signal voltage and currentDC 9 to 24 V, 10 mA maximum
AC output load rating0 to 250 VAC, 5 A
DC output load rating0 to 30 VDC, 5 A
Operating temperature-10 to 50°C
Ambient humidity10 to 95% RH, noncondensing
Dimensions77 × 85.2 × 34.8 mm

The board supply and digital inputs have different voltage ranges: DC 12 to 24 V at the power terminals and DC 9 to 24 V at the digital inputs. The relay load rating depends on whether the load uses AC or DC.

Digital inputs and relay outputs

The input terminals are IN1 to IN4. The input circuit uses photocoupler isolation, and the circuit sheet describes the input common as bidirectional and nonpolar. Green LEDs indicate input activity.

The output terminals are OUT1 to OUT4 and COM. The output circuit sheet specifies relay contacts, photocoupler isolation, a 10 ms response time and red status LEDs.

ChannelInput terminalInput GPIOOutput terminalOutput GPIO
1IN1GPIO_10OUT1GPIO_14
2IN2GPIO_11OUT2GPIO_15
3IN3GPIO_12OUT3GPIO_16
4IN4GPIO_13OUT4GPIO_17

RS-232C and RS-485

RS-232C uses the CH1 D-sub connector. RS-485 uses the upper terminal block, labeled D+, D− and GND in the board layout.

InterfaceSignalGPIO
RS-232CTX0GPIO_0
RS-232CRX0GPIO_1
RS-485TX1GPIO_8
RS-485RX1GPIO_9

This table maps the board GPIOs to communication signals. It is separate from the physical pin numbering of the D-sub connector.

Additional pins in the board layout

The layout also labels AD0 and AD1 and the GPIOs for the MODE switch.

FunctionBoard labelGPIO
AnalogAD0GP26
AnalogAD1GP27
MODE switchX1GP18
MODE switchX2GP19
MODE switchX4GP20
MODE switchX8GP21

The supplied specifications do not state the input voltage range for AD0 or AD1. The digital inputs’ DC 9 to 24 V rating does not apply to these analog terminals.

The product photo also shows the USB DOWNLOAD port, BOOT MODE button and CPU RESET-SW.

PICO-IO8R appears in the Senbrino supported board list, which describes the development environment and its use.

Sources

This article uses the supplied PICO-IO8R ratings, GPIO tables, board layout and I/O circuit descriptions. The output load ratings follow the main ratings table, which specifies separate limits for AC and DC.