User manual

1.4.4 SETUP AND COM PORTS
The SETUP and COM serial connections are DE-9F RS-232 ports. The pin-out for the SETUP and COM ports are shown in
the table below.
Serial port considerations
• Guardian radio modem SETUP and COM ports are Data Communication Equipment (DCE) devices
• In general, equipment connected to the Guardian’s SETUP / COM serial port is Data Terminal Equipment (DTE) and a
straight-through cable is recommended.
Note: If a DCE device is connected to the Guardian SETUP/COM port, a null cable/adapter is required.
Figure 3 Guardian SETUP / COM port Contact Numbering for Pin-Out
Table 4 Pin-Out for DCE SETUP and COM Port, 9 Contact DE-9 Connector
Contact
Signal Name
Signal Direction
1 Data Carrier Detect (DCD)
1
DTE ← DCE
2 Receive Data (RxD) DTE ← DCE
3 Transmit Data (TxD) DTE → DCE
4 Data Terminal Ready (DTR) DTE → DCE
5 Signal Ground (GND) DTE ― DCE
6 Data Set Ready (DSR)
2
DTE ← DCE
7 Ready To Send (RTS)
3
DTE → DCE
8 Clear To Send (CTS)
4
DTE ← DCE
9 Ring Indicator (RI)
5
DTE ― DCE
1
DCD is asserted on the COM port when a carrier is received. It is unused on the Setup port.
2
Always asserted with DTR applied.
3
RTS on the COM port requests transmitter key up in RTS/CTS activation mode. It is unused on
the Setup port.
4
CTS will be asserted when data can be sent on the COM port. It is unused on the Setup port.
5
Future use.
Guardian™ Serial Modem or Analog Radio for Licensed Spectrum PN 001-5006-000 Rev. 3 | Page 5