
Operation
RFI-148 250W VHF Paging Transmitter User Manual
Page 17 of 43
4.
Operation
4.1 Serial Port Operation
4.1.1 Overview
The RFI-148 250 has two DCE RS-232 serial ports. The front serial port has a female DE9 connector (DCE)
and the rear serial port has a male DE9 connector (DTE). The serial port pin outs can be found in Appendix
A.3 on page 26.
The main port (at the back of the transmitter) supports:
TX, RX, and GND.
RTS and DTR inputs.
CTS and DCD outputs.
The auxiliary (at the front of the transmitter) port supports:
TX, RX, and GND.
4.1.2 Configuration
Both main and auxiliary serial ports support the following configuration options:
Baud rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600 or 115200.
Data bits: 7 or 8
Parity: None, odd, or even
Stop bits: 1 or 2
4.1.3 Statistics
Statistics are maintained for both serial ports. These statistics are listed in Table 12 in Appendix C.1. All
statistics are reset if power is removed.
These statistics may be useful in troubleshooting. For example, Rx framing errors may indicate that the
serial port configuration does not match the serial port configuration of the DTE.
4.2 Ethernet Operation
4.2.1 Overview
The paging transmitter has one 10BASE-T/100BASE-TX Ethernet port. Auto-negotiation of link speed is
supported, including duplex mode. There is also a software override for forcing the parameters of the link.