Sierra Wireless MP595W Manuale Utente
Configuring the MP Modem to Report GPS and I/O
Data
Rev 1.4 Draft Mar.08
59
A digital input can be connected to four of the pins on the
DB15HD connector: Pins 3, 4, 11, and 12. (Pins 3 and 11 could
alternatively be used for digital output.)
DB15HD connector: Pins 3, 4, 11, and 12. (Pins 3 and 11 could
alternatively be used for digital output.)
Note: Before using the input/output lines, you must configure them as
inputs or outputs.
inputs or outputs.
Typically a digital input device should be connected between
Ground (Pin 10) and the input port (Pin 3, 4, 11, or 12).
Ground (Pin 10) and the input port (Pin 3, 4, 11, or 12).
Figure 7-2: A button wired to Pin 4 (digital input) and Pin 10 (Ground).
The pins report a logic high on an input of 3.45 VDC. An
internal pull‐up resistor provides a high condition when the
switch is open.
internal pull‐up resistor provides a high condition when the
switch is open.
The digital input pins report a logic low on an input between
0 VDC and 0.8 VDC. Sinking the input pin to ground yields a
logic low (0x00) when the port is polled.
0 VDC and 0.8 VDC. Sinking the input pin to ground yields a
logic low (0x00) when the port is polled.
If you configure the MP modem to send data to a network
server, digital input data can be remotely monitored.
server, digital input data can be remotely monitored.
Example: panic button connections
An I/O cable for a panic button requires a wire to one of the
digital input or I/O pins (such as #3) and one wire to the
Ground pin (#10).
digital input or I/O pins (such as #3) and one wire to the
Ground pin (#10).