Hardware and Software Installation 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
69
1. Data Carrier Detect (DCD)
2. Transmitted Data (TxD)*
3. Received Data (RxD)*
4. Data Terminal Ready (DTR)
5. Signal Ground (GND)
6. Data Set Ready (DSR)
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
Serial Host
Diversity RF
USB Host
(that is, RxD is the Receive Data input to the MP modem,
and TxD is the transmit data out of the MP modem)
Figure 2-8: Pinouts for an RS232 male DB9 serial cable (left) that connects to
the MP 595 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: RS-232-C RS-232-C
Driver Receiver +15 V
+15 V
2 V
noise margin
+5 V
⎬
+3 V
-3 V
-5 V Mark logic 1 Mark logic 1
-15 V -15 V
Figure 2-9: Voltage specifications for the MP modem’s serial connector.
Install the USB, Ethernet or serial cable Space logic 0
Transmission
region
Space logic 0
Transmission
region
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.