User's Manual

MDS 05-4121A01, Rev. 02 TRM SB Integration Guide 27
11 OUT RX Audio—Filtered receive audio
•
For test purposes only
• Also available through J109 (Pin 1 – Out, Pin 2 – GND)
12 IN Shutdown
• Low = Radio powered down (off-line)
13 OUT RF synthesizer lock detect signal
• High = locked (Radio ready for service)
• Low = Out-of-lock (Radio disabled)
• Raw / “unfiltered”
14 No connection
15 OUT TX Clock—Transmit Data Clock
• Only applicable when “ CLK TX ” is programmed and TX
ON is asserted
• Clock goes from low to high to request each new TXD bit
•
Continuously high when in Configuration Mode (J100,
Pin 11 = Low), or when “ CLK RX ” is selected
16 No connection
17 OUT RX Clock— Always applicable when receiving
• Goes from low to high at the center of each RX Data bit
(receive mode)
• Provided when transmitting if “ CLK RX ” is programmed
• Goes from low to high to request each new TXD bit
• Continuously high when transceiver is in Configuration
Mode (J100, Pin 11 = Low)
18 Do not connect—Reserved for factory use only.
19 No connection
20 No connection
21 OUT RSSI—Receive Signal Strength Indicator
•
Analog voltage between 0 and 3 Vdc proportional to
signal strength on the channel
22 No connection
23 IN CONFIG—Configure Radio
•
High (unterminated) puts radio in normal payload mode
to receive or transmit data at the programmed rate
• Low (Ground/J108 Jumpered) puts radio in setup mode
to communicate with the processor at 38.4 kbps
asynchronously
24 No connection
25 No connection
Table 6. DB-25 Interface Connector Pinouts
Test and Evaluation PCB (Continued)
Pin
Number
Input/
Output Pin Description