A RAJU BROS COMPANY
DIO 7x7
SERIAL COMMANDS
Communication
- UART Baud Rate: 115200
Stop Bit 1
Relay Control:
R1 ON / R1 OFF ("R1 ON","R1 OFF")
....
R7 ON / R7 OFF
Relay Query:
R1?
...
R7?
Digital Input Query:
DI1?
...
DI7?
Reset:
RESET -> Turns all relays off
Identification:
*IDN?
Example code
C# Console app
using System;
using System.IO.Ports;
class Program
{
static void Main()
{
// Change COM3 to your actual port
using (SerialPort port = new SerialPort("COM3", 115200))
{
port.Parity = Parity.None;
port.DataBits = 8;
port.StopBits = StopBits.One;
port.Handshake = Handshake.None;
// Very important: device uses \n line endings
port.NewLine = "\n";
port.ReadTimeout = 1000; // 1 second
port.WriteTimeout = 1000;
port.Open();
Console.WriteLine("Port opened at 115200");
// Example 1: Get ID
port.WriteLine("*IDN?");
string line;
try
{
// DIO 7x7 prints 3 lines for *IDN?
line = port.ReadLine();
Console.WriteLine("Rx: " + line);
line = port.ReadLine();
Console.WriteLine("Rx: " + line);
line = port.ReadLine();
Console.WriteLine("Rx: " + line);
}
catch (TimeoutException)
{
Console.WriteLine("No response for *IDN?");
}
// Example 2: Turn R1 ON and check state
port.WriteLine("R1 ON");
// (No explicit reply, but IDEAL timer resets)
port.WriteLine("R1?");
try
{
line = port.ReadLine(); // should be "1" or "0"
Console.WriteLine("R1 state = " + line);
}
catch (TimeoutException)
{
Console.WriteLine("No response for R1?");
}
// Example 3: Query DI1
port.WriteLine("DI1?");
try
{
line = port.ReadLine();
Console.WriteLine("DI1 = " + line);
}
catch (TimeoutException)
{
Console.WriteLine("No response for DI1?");
}
port.Close();
}
}
}
Python
#> pip install pyserial
import serial
import time
# Change 'COM3' to '/dev/ttyUSB0' or similar on Linux
ser = serial.Serial(
port='COM3',
baudrate=115200,
bytesize=serial.EIGHTBITS,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
timeout=1 # seconds
)
print("Opened:", ser.portstr)
def send_cmd(cmd: str):
"""Send a command with newline and read one response line (if any)."""
print(f">> {cmd}")
ser.write((cmd + "\n").encode('ascii'))
try:
line = ser.readline().decode('ascii', errors='ignore').strip()
if line:
print(f"<< {line}")
return line
else:
print("<< [no data]")
return ""
except Exception as e:
print("Read error:", e)
return ""
# Example 1: *IDN?
send_cmd("*IDN?")
# DIO 7x7 sends 3 lines, so read additional:
for _ in range(2):
line = ser.readline().decode('ascii', errors='ignore').strip()
if line:
print("<<", line)
# Example 2: Relay ON / Query
send_cmd("R1 ON")
time.sleep(0.1)
send_cmd("R1?")
# Example 3: DI read
send_cmd("DI1?")
ser.close()
LAB VIEW
LabVIEW (VISA Serial) – Block Diagram Steps
In LabVIEW you’ll use VISA to open the serial port and read/write text.
A. Configure Serial Port
-
Place VISA Configure Serial Port block.
-
Set:
-
VISA resource: COM3 (or your port)
-
Baud rate: 115200
-
Data bits: 8
-
Parity: None
-
Stop bits: 1
-
Flow control: None
-
-
Enable termination character:
-
Termination char: 0x0A (newline \n)
-
Termination enabled: TRUE
-
B. Write Command (*IDN?)
-
Place VISA Write block.
-
Wire the VISA reference from Configure block.
-
Command string constant: "*IDN?\n"
-
Bytes to write is handled automatically from string length.
C. Read Response
-
Place VISA Read block.
-
Wire same VISA reference.
-
Set byte count (e.g., 256).
-
Because termination is enabled, VISA Read will stop when it sees \n.
-
Output string → indicator on the front panel to show response.
D. Example Flow
You can build a simple VI with:
-
Front Panel:
-
String control: Command (e.g., R1 ON, R1?, DI1?, RESET, *IDN?)
-
String indicator: Response
-
Button: Send
-
-
Block Diagram:
-
On “Send”:
-
Take Command, concatenate \n.
-
VISA Open (if not already open).
-
VISA Write.
-
VISA Read (optional, depending on command).
-
Display response in indicator.
-
-