Moxa OnCell G2150I Industrial Quad Band Modem ONCELL G2150I ユーザーズマニュアル

Total Solutions for Industrial Device Networking

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CSD (Circuit Switched Data) is the original form of data transmission 

developed for GSM systems. With a single radio time slot, CSD can 

transmit data at 9.6 to 14.4 Kbit/sec to both the GSM network and 

the PSTN switching subsystem over a direct call. Most of the time, 

transmission is initiated by standard AT commands. Since CSD 

provides direct modem access to remote devices, system extensions 

can be used without requiring the installation of cables and data lines. 

CSD overcomes the limitations of hard wiring and inaccessible terrain 

for easier, more flexible data collection and monitoring.

The OnCell G2150I are industrial quad-band GSM/GPRS modems that 

transmit data and short messages (SMS) over GSM/GPRS mobile 

networks. They can be used to improve the efficiency of maintenance 

and communication, independent of operating skill. The OnCell G2150I 

are also designed to be mounted on a DIN-rail or on the wall. It has 

a 12 to 48V DC power input, allowing different types of field power 

sources to be attached. The serial ports are also protected by 15 KV 

ESD line protection, so the system is safe from electrical discharge. 

Separate RS-232 and RS-422/485 interfaces are built into the OnCell 

G2150I GSM/GPRS modem, each with 2.5 KV RMS isolation for one 

minute. The two serial interfaces on OnCell G2150I also make it ideal 

for attaching all kinds of devices, such as stand-alone controllers, PC 

COM ports, or multi-dropped electric meters.

GPRS is packet-switched, which means that multiple users share the 

same transmission channel. It transmits only when there is outgoing 

data. At any moment, the available bandwidth can be dedicated 

immediately for users that are sending or receiving data. In general, 

a GPRS network can be viewed as a special IP network that offers 

IP connectivity to IP terminals. Devices such as PCs, embedded 

computers, and PPP-enabled PLCs can be easily connected to the IP 

network and the Internet.

+1-626-0001

Meter

+1-626-0002

+1-626-0003

Meter

Meter

Central Station

GPRS

IP Network

PPP Enabled

PC-Controller

The OnCell G2150I provides several LED indicators for basic status 

information. At a glance, users can see the signal strength and the 

Type

SIGNAL

PWR

GSM

GPRS

DATA

Color

Green

Green

Amber

Amber

Green

Description

Signal level (> L2 for data connection)

Power activated

GSM CSD connection established

GPRS connection established

Serial Tx/Rx

=

SIGNAL

GSM

GPRS

PWR

DATA

Numbers of 

Signal LEDs

Type of signal that can be transmitted

None

No signal, or SIM card is not installed properly, or PIN is 
not entered

1LED

Weak or insufficient (SMS only)

2LEDs

Average (good for GSM CSD and GPRS connections)

3LEDs

Exceptional (good for GSM CSD and GPRS connections)

TxD

RxD

RTS

CTS

DTR

DSR

8 Channel

2.5KV Isolation

RTU

PLC

TXD+
TXD-

RXD-

RXD+

4 Channel

2.5KV Isolation

RI

DCD

G2150I

G2150I

current mode of communication, such as CSD data or GPRS.