Instruction manual

Model DCP-NextG Digital Cell Phone Kit

4 Modem Overview

The SAM3G+ modem has two communication interfaces – USB and RS-232. The USB

interface is only used in conjunction with Intercel’s PC software and will not be discussed

here. Note that USB and RS-232 should never be connected simultaneously as both

interfaces provide power to the modem. The RS-232 interface is used to connect the modem

to a data logger.

The SIM card should be inserted as shown with the gold contacts facing downwards and the

notch at the corner of the card as shown in Figure 4-1.

The modem is supplied with an SMB-SMA adaptor for its antenna port. This makes it

possible to use this modem to replace modems that use SMA antennas such as the Maxon

Modmax.

5 Data Logger Port Connection

Different models of Campbell Scientific data loggers have either a CS I/O port and/or an

RS232 communication port(s). The SAM3G+ can be connected to either port. However, the

hardware configuration for connection to each port differs. Therefore, there are two different

kits available. Each kit includes all the necessary equipment required to connect the modem to

a Campbell Scientific data logger, on the appropriate communication port.

5.1 RS-232 vs CS I/O

Campbell Scientific CR800, CR1000, CR3000 and CR5000 data loggers all have two serial 9-

pin ports on them – RS232, a mature serial interface which can be found on some laptops and

CS I/O, which is a proprietary Campbell Scientific serial interface which pre-dates RS-232.

RS-232 can be used to communicate with radios, modems, PCs and other devices while CS

I/O can be used to communicate with and power Campbell Scientific devices such as radios,

multi-drop interfaces, Wifi interfaces and more.

Note: CS I/O is NOT compatible with RS-232! RS-232 devices will not work properly on a

CS I/O port due to different pin configurations and voltage levels. To connect an RS-232

device (such as a modem) to the CS I/O port, an adaptor such as an SC932A will be

necessary. DCP-SAM3G-CSIO kits are supplied with all necessary interfaces and cables.

USB

RS-232/Power

RJ45 Connector

Connector

for

Antenna

Status

LED

Figure 4-1 SAM3G+ MODEM