American Fibertek Net I/O N-111 - Manual (Page 10)

10
Connecting a serial device
The N-111 has a DB-9 serial port which can be configured in software for several
different communications modes. The method used to connect to the serial port will
vary depending on the hardware mode selected.
Connecting RS232
To connect the N-111 to a RS232 serial device, connect a serial cable from the serial
port on the rear of the N-111 to the serial device. The N-111 RS232 is configured as a
DTE device.
Connecting RS485 four-wire
To connect to a serial port in RS485 4-wire mode, you will need a DB9 connector wired
as indicated. Four connections will need to be made for the two data transmit lines and
the two data receive lines. Do not make any other connections to any other pins on the
DB9 connector.
Connecting RS485 two-wire
To connect to a serial port in RS485 4-wire mode, you will need a DB9 connector wired
as indicated. Two pairs of pins on the DB9 will need to be bridged together. Two
connections will then need to be made to the bridged pins for the two bidirectional data
lines. Do not make any other connections to any other pins on the DB9 connector.