CalAmp SMC-CDMA Series, User Manual

Page: 11 / 62

001-0004-819 Rev01
Page 11 of 62
Pin Descriptions
Pin #
Pin
Name
I/O
Type
Description
24 -RESET Input
This signal can be used to turn the C24 module on or off. If the unit
is on, asserting a low for a minimum of 2 seconds will shut the C24
module off. Asserting a low for not more than 0.5 seconds will
power the C24 back on. Data stored in volatile memory will be lost.
This line must be driven by an open drain or open collector. If
unused, keep line open.
26, 41, 63 GND Ground
33 -RTS Input Request to Send. Signal used for hardware flow control
34 -RXD Output
Received Data. Line used to send received data and modem
responses to the DTE (Data Terminal Equipment)
35 -TXD Input
Transmitted Data. Line used to send data and transmit commands
from the DTE.
36 -RI Output Ring Indicator. Output low (ON) indicates the presence of a ring
signal.
37 -DSR Output Data Set Ready. Line used to indicate modem status to the DTE.
38 -CTS Output Clear to Send. Line controlled by the modem to indicate whether or
not the modem is ready to transmit data.
39 -DCD Output
Data Carrier Detect. Line asserted by the DTE to indicate connection
status.
40 -DTR Input
Data Terminal Ready. Line asserted by the DTE to indicate that it is
ready to transmit or receive data.
61 VCC Power +5 VDC ±0.25 VDC
Serial UART1 Input lines: Input High, Min 3.5 V
Input Low, Max 1.5 V
Serial UART 1 Output Lines: Output High, Min 4.2 V
Output Low, Max 0.4 V
Serial UART 1 Line Current: Drive: I
OUT =
6.0 mA
NOTE: VCC is the maximum voltage rating on Primary Serial UART 1 input pins.
Serial UART 2 Input lines: Input High, Min 2.0V
Input Low, Max 0.3 V
Serial UART 2 Output Lines: Output High, Min 2.6 V
Output Low, Max 0.3 V
Serial UART 2 Line Current: Drive: I
OUT
4.0 mA
NOTE: 3.0 VDC is the maximum voltage rating on Secondary Serial UART 2 input pins.