User's Manual

26 TRM SB Integration Guide MDS 05-4121A01, Rev. 02
Invisible place holder
Figure 9. Test and Evaluation PCB Assembly
(With TRM SB module installed and retainers on RF connector end.)
3.3 VDC IN
TRM SB MODULE
6–12 VDC IN
EIA/RS-232 I/O
TEST ANTENNA/LOAD
DB-25(F)
ACTIVITY
LEDS
Table 6. DB-25 Interface Connector Pinouts
Test and Evaluation PCB
Pin
Number
Input/
Output Pin Description
1 IN/OUT Ground (Signal)
2IN TX Data—Transmit Data (payload) in normal operation
3 OUT RX Data—Receive Data
• Receive data (off-the-air) in normal operation
•
Control data from the processor in setup mode
4 OUT TX ON—Request to key radio transmitter
• High puts radio in transmit mode
• Low puts radio in receive mode
5
6 No connection
7 IN/OUT Ground (Signal)
8 OUT CD—Carrier Detect
•
Low whenever RSSI exceeds the programmed CDR
threshold.
• Detects RF activity on the radio channel without
consideration for the signals modulation type or protocol.
9 Factory Test– Do not connect
10 No connection