M20 Terminal; General Information; Fig. 9-1 Modular Cellular Engine Siemens M20 Terminal - Siemens M20 Terminal Technical Description

Siemens Information and Communication Products
9

M20 Terminal

9.1

General information

The Siemens M20 Terminal is a GSM900 Phase II voice, data, group 3 fax and SMS terminal device. This device is in-
tended for universal use in various areas of application. A broad range of voltages is therefore available because common
industrial interfaces have been implemented.
The terminal is compatible in most themes of function and control with the GSM modules M1 and A1. An LED in the
robust plastic casing displays the operating status of the terminal.
The M20 Terminal can be mounted from above or below by means of two screws.
Mounting holes
V.24 interface
8–28.8V/DC line in/out
Power Off and SW download
Fig. 9-1 Modular Cellular Engine Siemens M20 Terminal
9.1.1 Features
• User-friendly integration in the system environment using commercially available connection components
• Data, voice, fax and SMS services (GSM Phase II)
• Power supply/ignition line on 6-pin Western connector
(8 V to 28.8 V DC, 5% ripple, surge Proof to 30V)
• Current consumption at 12V: Stand-by state (voltage is applied, ignition not yet asserted) I =/< 0.2 mA idle mo-
de: I < 60 mA average call in progress: peak: I < 2 A. (pulsed t = 577µs, at T = 4.615ms), arithmetic mean: I <
275 mA
• Level on the V.24 interface corresponding to V.28
• Protected V.24/V.28 interface with 9-pin SUB-D jack (screwed)
• Mini SIM card reader with integral drawer (3V)
• FME antenna jack (female) fed out per cable (approx. 10 cm)
• Listener interface on 4-pin Western connector (listener parameters can be set with AT commands/connection of
a commercially available headset)
• Mounting from bottom or top
• Resistant against supply voltage polarity reversal
Version 8 dated 15.03.00
Status LED
M20 Terminal
Handset
(not visible)
SIM card reader
Antenna connector
FME
A
202