User Guide

CTM-110/120 Installation & Operation Manual

Page 12

1702-0037 Rev 3.2

6.3 Connecting the serial data cable

The modem serial data port is a standard DB9 female connector configured as Data

Communication Equipment (DCE) and is wired as per the table below.

DB9

Signal Name Direction

1 DCD Data Carrier Detect Modem à PC

2 RxD Received Data (by DTE) Modem à PC

3 TxD Transmitted Data (by DTE) PC à Modem

4 DTR Data Terminal Ready PC à Modem

5 GND Signal Ground

6 DSR Data Set Ready Modem à PC

7 RTS Request To Send PC à Modem

8 CTS Clear To Send Modem à PC

9 RI Ring Indicator Modem à PC

The DTR signal (pin 4) is used for modem operation/standby control - refer to the

operation notes for details.

Serial data ports on most computer equipment are configured as Data Terminal

Equipment (DTE) with a DB9 male connector. The serial data cable supplied with the

CTM-110/120 will allow direct connection of the modem to most computer and

terminal equipment. In some cases it may be necessary to insert a “null modem” or

“gender changer” in the serial data line in order to correctly connect between the

devices.

6.4 Mounting and attaching the cell antenna

The antenna used with the CTM-110/120 must be a dual band type suitable for

operation on both the 800MHz Cellular and 1900MHz PCS bands. For regulatory

purposes the antenna must have a gain rating of less than 9dBi on each band. For

optimum performance the antenna should be mounted in a vertical orientation as high

up as possible and with clear line of sight in all directions. For regulatory purposes it

must be mounted in such a position as to maintain a separation distance from any

person of at least 20cm (8”).

The modem antenna connector is a standard SMA female type that requires the antenna

cable to use a male SMA connector.

6.5 Mounting and attaching the GPS antenna

The antenna used with the CTM-120 must be an active type with gain of at least 26dB

and requiring a 3.3 volt dc supply provided directly by the modem over the coax cable.

The antenna provided is a magnetic mount type for installation typically on an upper

horizontal surface of a vehicle with a clear 360 degree view of the sky.

The GPS antenna connector is a standard MCX type that requires the GPS antenna

cable to use a MCX plug connector.