Digi 5400-RM, User Manual, Page: 17 / 42

Physical installation Connecting the serial ports
Digi 5400-RM Cellular Remote Manager User Guide 17
1. Plug the power supply unit into an AC power outlet and connect to the 12V DC lead (4 pin
connector) cable.
2. Using a customer-provided CAT5 cable, connect to your site gateway and the LAN port of the
Digi 5400-RM.
Connecting the serial ports
The four serial ports on the Digi 5400-RM provide console access to connected critical equipment
through the cellular network, and optionally through a connected Ethernet LAN.
You must use a cable with an RJ45 connector to connect to the Digi 5400-RM with a RJ45, DB9F or
DB9M connector, as determined by your device type, to terminate to your device. Consult the user
guide for the device you are connecting to the Digi 5400-RM to determine the connector type, cable
type, and pinout positions for your specific device.
The serial ports are enabled by default. The network devices connected to the serial ports may be
accessed using the aView terminal window, the local device GUI, TCP, telnet, or SSH connections. TCP,
telnet and SSH connections to serial ports are disabled by default and must be enabled by a device
specific configuration. Connect up to four of your network devices to the Digi 5400-RM serial ports by
using the pinout information described in
Serial port pinout and use .
1. Plug the power supply unit into an AC power outlet and connect to the 12V DC lead (4 pin
connector) cable.
2. Using a customer-provided CAT5 cable, connect to your site gateway and the LAN port of the
Digi 5400-RM.
Serial port pinout and use
The RS232 standard requires support for baud rates up to 9600 baud on shielded multicore cable up
to 50 feet (15 meters) long. For the Digi 5400-RM, the use of standard CAT 5 cables enables serial
communication at all baud rates up to 50 feet. CAT5 unshielded twisted pair cable lengths much
longer than 50 feet have been verified at 9600 baud but are non-standard and are not guaranteed.
The Digi 5400-RM RS232 serial port is DTE and has the following pin configuration.
Pin 1 RTS Request to send Output from Digi 5400-RM
Pin 2 DCD Data carrier detect Output from Digi 5400-RM
Pin 3 RXD Receive data Input to Digi 5400-RM
Pin 4/5 — Ground Signal ground
Pin 6 TXD Transmit data Output from Digi 5400-RM
Pin 7 DTR Data terminal ready Input to Digi 5400-RM
Pin 8 CTS Clear to send Input to Digi 5400-RM
Note Ring indicate (RI) and data set ready (DSR) are not implemented.