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COM

Serial Port Specifications

COM1 & COM2 support RS232/RS485 protocols; COM3 & COM4 support RS232 protocol. Serial ports operate exclusively on the real-time control layer without virtualization support.

COM1/COM2 Interface Definition (RS232/RS485 Dual-Mode)

COM1/COM2 Pinout
Pin assignments for combo RS232/RS485 ports

Pin Signal Name Pin Signal Name
1 COM1_DCD# / RS485- 6 COM1_DSR#
2 COM1_RXD / RS485+ 7 COM1_RTS#
3 COM1_TXD 8 COM1_CTS#
4 COM1_DTR# 9 N/C (Reserved)
5 GND

COM3/COM4 Interface Definition (RS232)

Pin Signal Name Pin Signal Name
1 Not Connected 6 Not Connected
2 RXD 7 Not Connected
3 TXD 8 Not Connected
4 Not Connected 9 Not Connected
5 GND

Protocol Implementation Notes

  • Dual-Mode Signaling: COM1/COM2 pins 1/2 serve dual roles:
    ⚡ Standard RS232 signals (DCD#, RXD)
    ⚡ RS485 differential pairs (RS485-/RS485+)
  • Hardware Selectable: Protocol mode determined by DIP switch or BIOS setting
  • Industrial Isolation: 2.5kV optical isolation on all serial ports (IEC 61000-4-5)
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Last modified: 2025-10-22