User's Manual

RB8762 Designer’s Guide_draft v04 12
RB8762MB RS232 DB9 Pin Definitions
The pin definitions of DB9 used on the RB8762MB RS232 Serial Connector are as follows:
1. DCD: Input, Carrier Detect
2. RXD: Input, Received Data
3. TXD: Output, Transmit data
4. DTR: Output, Data Terminal ready
5. GND: Ground
6 DSR: Input, Data Set Ready
7. RTS: Output, Request to Send
8. CTS: Input, Clear to Send
9. RI: Input, Ring Indicator
Layout Design Suggestions
• General Layout Rules- All Printed Circuit Boards must comply with UL94V0 standard
for flammability. Always use RoHS compliant Parts and materials.
• Suggestions for Layout:
1. Do not place Power circuit, X’tal, Inductor, etc near RF area.
2. The bigger Antenna clearance area, the better. The Antenna itself needs to stay away
from any circuit or component at least 3mm. Antenna clearance area means Top and
Bottom both required to be cleared.
3. Do not use metal materials on design where near Antenna area. For example, battery
snaps, USB connector, iron case, etc.
These guidelines are for design reference; real performance still depends on actual design.