1
T 324 - GSM 712 Eng.
04.01.01
We reserve the right to make changes without notice
COSTER
T 324
04.01.01
GSM DESK-TOP MODEM
GSM 712
Eng.
1.APPLICATION
GSM 712 modem is used in “TELECOSTER” telemanagement systems for transmitting data to and from remote
plants (e.g. boiler plants) where GSM modems are installed.
2.FUNCTIONS
GSM 712 is a GSM dual band modem (900/1800 MHz) with a transmitting speed adjustable from 1200 to 9600 bps
both in non-transparent mode (with error correction) and transparent (without error correction).
It supports AT+ controls in conformity with ETSI GSM 07.07 standard.
It incorporates a self-diagnosing function that indicates the GSM network signal strength.
The digital interface conforms to ITU-TV.24 and V.28 Recommendations.
3.REFERENCE STANDARDS
The protocols are based on the following standards:
• ETSI GSM 07.07 : European digital cellular telecommunication system (phase 2). At command set for GSM
Mobile Equipment.
• ETSI GSM 07.05 :
European digital cellular telecommunication system (phase 2). Use of DTE/DCE interface for
Short Message service and cell broadcast service.
• ITU-T V.25ter :
"serial asynchronous automatic dialling and control"
• Uses GSM 900/1800 MHz digital telecommunication networks
• Communication with GSM remote modems
4.TECHNICAL DATA
•
Transmission data:
Data format
asynchronous start-stop
Character format
7/8 data bits, 1/2 stop bits,
parity odd/even/none
Transmission speed
1200 ... 9600 bps
Transmission standard
V.22bis, V.32
Transmission mode
full duplex
Interface speed
300 bps ... 115.2 Kbps
Data Terminal Equipment interface conforms ITU-T V.24/V.28
tested on female connector DB25 (ISO.2110)
Data Terminal Ready
the OFF status of DTR prevents
the transmission/reception of the modem
Traffic control
RTS/CTS
Power RF output (max)
33 dBm
±
2 dB (900)
30 dBm
±
2 dB (1800)
RF antenna
FME connector
•
Electrical & mechanical
Power supply
external transformer (supplied with modem)
Input : 230 V ~
±
10 %
Output : 15 V ~ 200 mA
or:
12 V –
Protection
self-reset 0.5 A fuse
Construction standards
Italian Electrotech. Committee (CEI)
Ambient temperature:
- operation
– 20 ... + 55
°
C
- storage
– 25 ... + 70
°
C
Dimensions
130 x 135 x 27 mm (W x D x H)
Weight
0.2 kg
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