feat: add IT6000C eload driver (PyVISA) with manual control CLI
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@@ -0,0 +1,97 @@
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import time
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import pyvisa
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class EloadError(Exception):
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pass
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class EloadConnectionError(EloadError):
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pass
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class EloadCommunicationError(EloadError):
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pass
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class Eload:
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"""ITECH IT6000C bi-directional supply, used here as an electronic load (CV mode with +/- current limit)."""
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def __init__(self, resource_name, baud_rate=9600, timeout_ms=3000, retries=3, retry_delay_s=0.2):
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self._retries = retries
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self._retry_delay_s = retry_delay_s
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try:
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self._rm = pyvisa.ResourceManager()
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self._inst = self._rm.open_resource(resource_name)
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except pyvisa.VisaIOError as exc:
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raise EloadConnectionError(f"failed to open {resource_name}") from exc
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self._inst.baud_rate = baud_rate
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self._inst.write_termination = "\n"
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self._inst.read_termination = "\n"
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self._inst.timeout = timeout_ms
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def _write(self, cmd):
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for attempt in range(self._retries):
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try:
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self._inst.write(cmd)
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return
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except pyvisa.VisaIOError as exc:
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if attempt == self._retries - 1:
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raise EloadCommunicationError(f"write failed: {cmd!r}") from exc
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time.sleep(self._retry_delay_s)
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def _query(self, cmd):
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for attempt in range(self._retries):
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try:
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return self._inst.query(cmd).strip()
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except pyvisa.VisaIOError as exc:
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if attempt == self._retries - 1:
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raise EloadCommunicationError(f"query failed: {cmd!r}") from exc
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time.sleep(self._retry_delay_s)
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def set_remote(self):
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self._write("SYST:REM")
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def set_local(self):
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self._write("SYST:LOC")
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def set_mode_cv(self):
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self._write("SOUR:FUNC VOLT")
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def set_mode_cc(self):
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self._write("SOUR:FUNC CURR")
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def set_voltage(self, volts):
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self._write(f"VOLT {volts}")
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def set_current(self, amps):
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self._write(f"CURR {amps}")
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def set_current_limit_positive(self, amps):
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self._write(f"CURR:LIM:POS {amps}")
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def set_current_limit_negative(self, amps):
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self._write(f"CURR:LIM:NEG {amps}")
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def output_on(self):
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self._write("OUTP ON")
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def output_off(self):
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self._write("OUTP OFF")
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def is_output_on(self):
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return self._query("OUTP?") == "1"
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def measure_voltage(self):
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return float(self._query("MEAS:VOLT?"))
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def measure_current(self):
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return float(self._query("MEAS:CURR?"))
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def measure_power(self):
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return float(self._query("MEAS:POW?"))
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def disconnect(self):
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self._inst.close()
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@@ -0,0 +1,114 @@
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import sys
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import time
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from pathlib import Path
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sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
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import msvcrt
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from drivers.eload import Eload, EloadError
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def main():
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com_input = input("Enter COM port number (e.g., 5 for COM5): ").strip()
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try:
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com_num = int(com_input)
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except ValueError:
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print("Invalid input. Please enter a numeric COM port number.")
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return
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resource_name = f"ASRL{com_num}::INSTR"
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try:
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eload = Eload(resource_name)
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except EloadError as exc:
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print(f"Failed to open port {resource_name}: {exc}")
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return
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eload.set_remote()
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quick_voltage_mode = False
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while True:
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cmd = input("\nCommand [on/off/set | manual/remote | status/monitor | setopt | exit]: ").strip().lower()
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try:
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if cmd == "set":
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eload.set_mode_cv()
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v = float(input("Enter voltage setpoint (V): ").strip())
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eload.set_voltage(v)
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print(f"Set voltage to {v} V.")
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if not quick_voltage_mode:
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i_pos = float(input("Enter positive current limit I+ (A): ").strip())
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i_neg = float(input("Enter negative current limit I- (A): ").strip())
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eload.set_current_limit_positive(i_pos)
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eload.set_current_limit_negative(i_neg)
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print(f"Set I+ limit = {i_pos} A, I- limit = {i_neg} A.")
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time.sleep(1)
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print(f"Measured voltage after set: {eload.measure_voltage()} V")
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print(f"Measured current after set: {eload.measure_current()} A")
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elif cmd == "setopt":
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quick_voltage_mode = not quick_voltage_mode
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mode_desc = "Voltage-only SET enabled" if quick_voltage_mode else "Full voltage+current SET enabled"
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print(f"Set behavior changed: {mode_desc}.")
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elif cmd == "on":
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eload.output_on()
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time.sleep(1)
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if eload.is_output_on():
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print("Output is ON.")
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print(f"Measured voltage: {eload.measure_voltage()} V")
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print(f"Measured current: {eload.measure_current()} A")
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else:
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print("Failed to turn ON.")
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elif cmd == "off":
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eload.output_off()
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time.sleep(1)
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v = eload.measure_voltage()
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print(f"Measured voltage after OFF: {v} V")
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print("Voltage properly dropped to ~0 V." if v <= 0.1 else "Warning: Voltage still present!")
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elif cmd == "status":
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print(f"Output status: {'ON' if eload.is_output_on() else 'OFF'}")
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print(f"Measured voltage: {eload.measure_voltage()} V")
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print(f"Measured current: {eload.measure_current()} A")
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elif cmd == "monitor":
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print("Monitor mode started. Press any key to stop.")
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try:
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while True:
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print(f"Voltage: {eload.measure_voltage()} V | Current: {eload.measure_current()} A")
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for _ in range(10):
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if msvcrt.kbhit():
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msvcrt.getch()
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raise KeyboardInterrupt
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time.sleep(0.1)
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except KeyboardInterrupt:
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print("\nMonitor mode stopped.")
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elif cmd == "manual":
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eload.set_local()
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print("Switched to manual (local) mode.")
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elif cmd == "remote":
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eload.set_remote()
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print("Switched back to remote control mode.")
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elif cmd == "exit":
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eload.set_local()
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print("Exiting and returning to manual mode...")
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break
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else:
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print("Unknown command. Please enter one of: on/off/set | manual/remote | status/monitor | setopt | exit.")
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except EloadError as exc:
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print(f"Eload error: {exc}")
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eload.disconnect()
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if __name__ == "__main__":
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main()
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