Microtronix Access Serial-TCP/IP Converter
4.3 Async Cables – Serial USB ports
When a USB serial adapter is connected, the connector has a standard DB9M RS232 DTE pin
configuration.
4.3.1 Connecting to a DTE device
Standard null modem cables are used when connecting to a serial DTE device (like a PC COM port)
that has a DB25 or DB9 male connector.
Null modem cable part numbers
DB9MDB25M Serial port to DB25M
DB9MM Serial port to DB9M
4.3.2 Connecting to a DCE device
Standard straight through cables are used when connecting to a serial DCE device (like a modem) that
has a DB25 or DB9 female connector. If replacing a modem, avoid any modem handshake issues by
configuring the device's interface for “leased line” or “permanent modem” type connection.
Straight through cable part numbers
DB25MF Serial port to DB25F
DB9FDB25M Serial port to DB9F
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