MP875 Modem User Guide
Note: Ensure that the MP modem and your computer are powered off while installing cables.
Serial connector (DB9) pinouts
The MP modem is configured as DCE (Data Communications Equipment) and uses the standard RS232 pin designations:
DB9 MALE
1 | 5 | DB9 female connector |
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1.Data Carrier Detect (DCD)
2.Transmitted Data (TxD)*
3.Received Data (RxD)*
4. | Data Terminal Ready (DTR) | Serial Host | USB Host GPS |
5. | Signal Ground (GND) |
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6. Data Set Ready (DSR) | Main RF | ||
7.Clear To Send (CTS)
8.Request To Send (RTS)
9.Ring Indicator (RI)
*RxD and TxD are named with respect to the MP modem (that is, RxD is the Receive Data input to the MP modem, and TxD is the transmit data out of the MP modem.)
Figure 3-8: Pinouts for an RS232 male DB9 serial cable (left) that connects to the MP modem’s female DB9 serial connector (right). Note that the two figures’ pinouts are mirror images of each other, since they plug together.
The serial connector uses these voltage specifications:
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+15 V | Driver |
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Space logic 0 | 2 V | Space logic 0 |
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+5 V |
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Mark logic 1 |
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Figure 3-9: Voltage specifications for the MP modem’s serial connector.
Install the USB, Ethernet or serial cable
To install the USB, Ethernet, or serial cable, thread the cable through the vehicle and attach it to the USB, Ethernet, or serial connector on the MP modem.
Note: Do not connect the cables to the computer until you have installed the software. If you have an MP 595W and are planning on using a WAP connection, see “Plan your MP modem installation” on page 20 for more information.
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