User Manual

CompactRF
TM
Operating Manual: Chapter 2 Electrical/Physical 7
Pin Name No.
Description
I/O
DTR 21
RS-232 Data Terminal Ready. Active low
(TTL level) input.
I
DVcc 30
Positive Supply for Logic circuitry and I/O
pins. See Section 2.2 for DC Characteristics
GND 13-17
26,29,
35
Ground reference for logic, radio and I/O pins.
PGM 12
Programming Status indicator. This output is
for factory use only, and should normally be
left disconnected.
O
\Reset 31
Active low reset input to the module. See
Section 2.3 for timing information.
I
SYNC 6
Active high output indicates the modem is
synchronized with at least one other modem
O
RSSI1 7
Receive Signal Strength Indicator 1. This
output is the first of the three RSSI indicators
to become active high as the signal strength
increases. See Table 2 for details
O
RSSI2 8
Receive Signal Strength Indicator 2. This
output is the second RSSI indicator to become
active high as the signal strength increases.
See Table 2 for details.
O
RSSI3 9
Receive Signal Strength Indicator 3. This
output is the last RSSI indicator to become
active high as the signal strength increases.
See Table 3 for details.
O
RTS 22
RS-232 Request to Send. Active low (TTL
level) input.
I
RxD 27
RS-232 Receive Data. TTL level output.
O
RXMODE 10
Active high output indicates module is
receiving data over the RF channel.
O
SCK 20
ISP Programming Clock. Used in conjunction
with RxD and TxD when upgrading the
FLASH-based firmware.
I
TxD 28
RS-232 Transmit Data. TTL level input.
I
TXMODE 11
Active high output indicates module is
transmitting data over the RF channel.
O
\Sleep 19
Assert low to put the unit to sleep. See
Section 2.3 for timing information.
I
NC 1-4,
32,33
No Connect