User manual

73 Appendix B
Table B.4: COM Port Pin9 Output Type Configuring (JP5/JP6/JP7/JP8)
* This function is for JP8 only.
B.4 Watchdog Timer Configuration
An onboard watchdog timer reduces the chance of disruptions which
EMP (electromagnetic pulse) interference can cause. This is an invalu-
able protective device for standalone or unmanned applications. (Refer to
Appendix D.)
Pin No. Open/Closed Function Description
Pin3,4 Closed COM1/COM2/COM3 port Pin9 Ring (Default)
Pin1,3 Closed COM1/COM2/COM3 port Pin9 output +5V