Hello everyone,
I am trying to commission a SNAP-PAC-R2 controller. My primary goal is to establish a TCP/IP connection and assign an IP address to bring the device online. However, the controller is completely undiscoverable on the network using PAC Manager.
Current Status: Upon power-up, the STAT LED blinks red 4 times, pauses, and repeats. I understand this indicates an invalid or corrupted MAC Address in the EEPROM, which explains why the Ethernet connection is impossible and why I cannot assign an IP.
Troubleshooting Steps Taken:
Factory Reset: I performed a full factory reset (holding the RESET button until the LED turned solid green). The controller rebooted but immediately returned to the “4 red blinks” error state. The Ethernet port remains inactive.
Serial Connection Attempt (Fallback): Since TCP/IP communication was impossible, I attempted to connect via the Serial port (RS-232) to diagnose the issue or force a firmware reload.
I fabricated a custom USB-to-DB9 cable.
Cable Verification: I performed a physical loopback test (bridging TX and RX) on the cable. Using Tera Term, I confirmed that characters were echoing back correctly, verifying the cable and adapter are working.
Connection: I connected to the R2 (PC-TX to PLC-RX, PC-RX to PLC-TX, GND to COM) with settings: 115200, 8, N, 1, None.
Result: Even via serial, I get no response in the terminal upon boot up. The console remains blank.
Is there any way to recover the MAC address or force an IP assignment when the controller is in this specific error state and the serial port appears unresponsive?
Any advice would be greatly appreciated.