Network Control Module 300 Series Technical Bulletin 13
Applications requiring a modem with an NCM300 Series device
should use an external, stand-alone modem. Keep the following in
mind when using an external modem with an NCM300:
• The maximum speed of a device connected to Port 2 or Port 3 is
19.2 K.
• Connect the external modem directly to either Port 2 or Port 3.
However, if the modem is connected to Port 3, that port is no
longer available for direct connect diagnostics.
• An external modem can be used in Port 5 or Port 6 (ISA slots) if a
non-PnP serial adapter board is installed. The serial adapter board
must be a 16-character First-In, First-Out (FIFO) card. The serial
card must use a 16550 UART chip or equivalent.
• Modems connected to the ISA slots via serial adapter boards
support higher baud rates than modems connected to Ports 2 or 3.
• Do not connect an external modem to Port 4.
• Only one dial-up OWS or Operator Terminal (OT) can be
connected to the NCM.
• Set a dial-up printer to its highest baud rate (that is, 9600).
Refer to Port Configurations: Standard Functionality under Design
Considerations in this document for a list of valid baud rates.
Note: You can download from an OWS to an NCM though a serial
card or external modem connected to an ISA slot if you are using an
NCM350 with Metasys Release 8.0 or later software. If you are using
an NCM300, you must download through Port 2 or 3.
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