Dongubak
60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
#!/usr/bin/env python3
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"""Scan an RS485 bus for ZLAC8015D drivers and report which node IDs answer.
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Requires: pip install pymodbus pyserial
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Example:
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python3 zltech_scan_ids.py --port /dev/tty.usbserial-XXXX
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python3 zltech_scan_ids.py --port COM5 --baud 115200 --range 1 10
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"""
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import argparse
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import sys
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from zltech_modbus import REG_NODE_ID, make_client, read_register
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def scan(port: str, baud: int, id_range, timeout: float):
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found = []
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client = make_client(port, baud, timeout)
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if not client.connect():
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print(f"ERROR: could not open serial port {port}")
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sys.exit(1)
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try:
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for node_id in id_range:
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values = read_register(client, node_id, REG_NODE_ID, 1)
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if values is not None:
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found.append((node_id, values[0]))
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print(f" id {node_id:3d}: responded (node-id register reads {values[0]})")
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finally:
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client.close()
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return found
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def main():
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parser = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
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parser.add_argument("--port", required=True, help="Serial port, e.g. /dev/tty.usbserial-XXXX or COM5")
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parser.add_argument("--baud", type=int, default=115200, help="Baud rate (default 115200, the driver default)")
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parser.add_argument("--range", nargs=2, type=int, metavar=("START", "END"), default=[1, 16],
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help="Inclusive node-ID range to scan (default 1 16)")
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parser.add_argument("--timeout", type=float, default=0.15, help="Per-ID response timeout in seconds")
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args = parser.parse_args()
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start, end = args.range
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id_range = range(start, end + 1)
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print(f"Scanning {args.port} @ {args.baud}bps for node IDs {start}-{end} ...")
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found = scan(args.port, args.baud, id_range, args.timeout)
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print()
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if found:
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print(f"Found {len(found)} driver(s):")
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for node_id, _ in found:
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print(f" -> ID {node_id}")
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else:
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print("No drivers responded. Check wiring, baud rate, and that only powered drivers are on the bus.")
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sys.exit(1)
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if __name__ == "__main__":
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main()
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