MP 555 GPS Software Installation and Configuration Guide
Connecting these devices requires that you make a customized
I/O cable. The cable must have, at one end, whatever connector
is required by the I/O device, and at the other end, the DB15
connector. The cable wires must pin to the appropriate pin
numbers on the I/O connector. The pinouts are described in the
next section.
The maximum length of the I/O cable is 15 feet.
Connector pinouts
The MP 555 GPS modem’s I/O port is a female DB15 connector
with eight active I/O pins:
•
Two (2)
digital I/O
ports.
•
Two (2)
digital input
ports.
•
Four (4)
analog input
ports.
There are six reserved pins, and one ground pin.
DB15 MALE
1.
Reserved—do not connect
2.
Reserved—do not connect
3. Digital I/O 1 (Din1/Dout1)
4. Digital input 3 (Din3)
5.
Reserved—do not connect
6.
Reserved for future support
of differential GPS—do not
connect
7. Analog input 2 (Ain2)
8. Analog input 4 (Ain4)
12. Digital input 4 (Din4)
9.
Reserved—do not connect
13.
Reserved—do not connect
10. Ground (GND)
14. Analog input 1 (Ain1)
11. Digital I/O 2 (Din2/Dout2)
15. Analog input 3 (Ain3)
Figure 5-1: Pinouts for a male DB15 I/O cable (left) that connects to the
MP 555 GPS modem’s female DB15 I/O connector (right). Note that the two
figures’ pinouts are mirror images of one another, since they plug together.
Port specifications
Note: No more than 36 VDC
See “I/O port characteristics” on page 64 for the technical
should be applied to any I/O
specifications of the I/O ports, including input voltages.
pins.
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