Ive installed NPort/NE series Driver properly, but why can not my application program (AP) open ports successfully?
POSSIBILITIES: 1. Improper IP configuration. 2. Improper OP_mode . 3. DHCP issue. 4. Access authorization. 5. COM port No. conflicts with other devices. 6. Your firewall filter rule discards the specific TCP packet. 7. DE-311/211 has a DIP SW1 setting error. 8. Port is occupied. 9. Forget to click ‘Apply’ and ‘Save’ button. SOLUTIONS: Make sure that your Host is able to PING the NPort. Your operation mode must be [ Host Based / Driver Mode] or [Real COM Mode]. If your Host and NPort are in DHCP environment : a) You have to assign a fixed IP address to NPort & your Host. b) Under DHCP environment, you can map a specific IP address to your NPort’s & Host’s MAC address. Use NPort Configurator or Administrator to check the NPort’s access control list; your Host IP must exist in NPort’s access control list. Check if there is any other installation using the same COM port number, e.g., internal modem on COM3. Check filter rules to open TCP port # 950(to 965) & # 966(to 981). The DE-311/211’s
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