Selected Pepwave MAX routers feature a RS-232 serial interface on the built-in terminal block. The RS-232 serial interface can be used to connect to a serial device and make it accessible over an TCP/IP network.
The serial interface can be enabled and parameters can be set on the web admin page under Advanced > UART. Make sure they match the serial device you are connecting to.
There are 4 pins i.e. TX, RX, RTS, CTS on the terminal block for serial connection and they correspond to the pins in a DB-9 connector as follows:
| DB-9 | Pepwave MAX Terminal Block |
|---|---|
| Pin 1 | – |
| Pin 2 | Rx (rated -+25V) |
| Pin 3 | Tx (rated -+12V) |
| Pin 4 | – |
| Pin 5 | – |
| Pin 6 | – |
| Pin 7 | RTS |
| Pin 8 | CTS |
| Pin 9 | – |
The RS232 serial interface is not an isolated RS232. External galvanic isolation may be added if required.
Be sure to check whether your serial cable is a null modem cable, commonly known as crossover cable, or a straight through cable. If in doubt, swap Rx and Tx, and RTS and CTS, at the other end and give it another go.
Once connected, your serial device should be accessible on your Pepwave MAX router LAN IP address at the specified TCP port.