CalAmp SMC-GPRS Series, Руководство пользователя

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001-0004-829 Rev00
Page 11 of 84
Pin Descriptions
Pin #
Pin
Name
I/O
Type
Description
24 -RESET Input
This signal is used to force a reset procedure by providing a low
level for at least 10 ms. 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
Digital Input lines: Input High, Min 3.675 V
Input Low, Max 1.4 V
Digital Output Lines: Output High, Min 4.0 V
Output Low, Max 0.4 V
Digital Line Current Drive: 2.0 mA
NOTE: VCC is the maximum voltage rating on Serial UART input pins.