User Manual

MDS 05-4055A01, Rev. A MDS entraNET 900 System Guide (Preliminary) 127

6.2.2 COM1 Port

To connect a PC to the transceiver’s COM1 port use a DB-9M to DB-9F

cross-over cable. This cable may also be purchased from a computer

retail store or mail-order company. For custom interface cables, use the

pinout information in Figure 6-2 and Table 6-2.

Figure 6-2. COM1 Port (DCE)

(Viewed from the outside of the unit.

)

6.2.3 COM2 Port

Figure 6-3. COM2 Port (DTE)

Viewed from the outside of the radio

Table 6-2. COM1 Port Pinout, DB-9F/RS-232 Interface

Pin Functions DCE

1 Unused

2 Receive Data (RXD) <—[ Out

3 Transmit Data (TXD) —>[ In

4 Unused

5 Signal Ground (GND)

6–9 Unused

Table 6-3. COM2 Port, DB-9M/EIA-232 Interface

Pin Functions DTE

1 Data Carrier Detect (DCD) In ]<—

2 Receive Data (RXD) In ]<—

3 Transmit Data (TXD) Out ]—>

4 Data Terminal Ready (DTR) Out ]—>

5 Signal Ground (GND)

6 Data Set Ready (DSR) In ]<—

7 Request-to-Send (RTS) Out ]—>

8 Clear-to-Send (CTS) In ]<—

9 Unused