| 3 Watt Cell Modem |
ACMM
900-3W 3 Watt Cellular modem
ACMM 900-3W is a low power 3 watt
solution for packet data communications over AMPS network .
The Cellular Modem Module, ACMM 900-3W, uses the Advanced Mobile Phone System (AMPS) cellular network for data transmission. AMPS is the cellular system used in North America, Latin America, Australia, New Zealand and parts of Africa. AMPS system is not compatible with the digital systems, such as GSM, PCS or CDMA.
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Applications
Packet Data Radio
SCADA
Telemetry
Remote gas/water/electric meter readings
Factory automation systems
Vending machines
Overview
The ACMM 900-3W is a low power solution for packet data communications over AMPS network . It is ideal for monitoring of pressure, temperature, liquid level, flow, etc. in industrial and commercial applications. The Cellular Modem Module ACMM 900-3W acts as a standard RS 232 "AT" command compatible modem. This allows compatibility with popular software packages such as Procomm, HyperTerminal, Bitcom, Winfax, etc.
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Applications:
Example applications for data communications with ACMM 900-3W include:
Packet Data Radio
SCADA and Telemetry Systems
Remote gas/water/electric meter readings.
Factory Automation systems
Vending Machines
Unit includes:
ACMM 900-3W unit
(Power supply and antenna are optional)
RS 232 Cable (DB9, M-F)
This USER GUIDE
MODEM SETUP AND REGISTRATION
What you need to provide:
5 Volts, 1500 ma regulated DC Power Supply
Host PC with a terminal program, such as Hyper terminal, ProComm etc.
Mobile Identification Number (MIN) provided by your Cellular service provider.
MIN is your cellular phone number.
System ID (SID) information
(from your cellular service provider) SID uniquely
identifies your cellular service provider.
Registering the Cellular Modem Unit:
To register your cellular modem unit, do the following:
Contact your cellular service provider
Provide the cellular operator with the ESN (Electronic Serial Number) number
located on the label at the top of your unit.
Inform the cellular
operator that the unit is an AMPS ONLY ANALOG unit with
a power rating of Class 1 (power 3 W).
The cellular operator will register your unit and provide you the following information:
MIN (Mobile Number) Number
System preference: A or B
SID (System ID)
Cellular Modem Module (AMPS)
| Specifications | ||
| Date Rate | Upto 9600 bps | |
| Data Compression | MNP 2-4, MNP 5, V42.bis | |
| and Error Correction | MNP 10 | |
| DTE Rate | Upto 57600 bps (switch selectable) | |
| Transmit Power | 3W | |
| Interface | RS 232 Asynchronous | |
| Signals Supported | TXD, RXD, CD, DSR, RTS, CTS | |
| Power Supply | 12V @ 1.5 A | |
| Mechanical | 4.5 x 2 x 1 inches L x W x H) | |
| Environment | -10 to +70° C | |
| Humidity | 90% non-condensing | |
| Custom Options | Yes | |
| Ordering Information | ||
| ACMM 900-3W (3W option) | ||
FREQUENTLY ASKED QUESTIONS (FAQ)
Q1: What is the flow control method recommended?
A1: If the host is a PC, Hardware flow control is recommended.
However, in most control instrumentation, either software or no flow control is called for.
Q2: How do I disable any flow control?
A2: Simply disable both the Hardware and software control switch settings. This is not recommended for large file transfers.
Q3: I need to connect the Cellular Data Link to a machine, which
does not understand your messages.
All it needs is data. Which configuration is
recommended?
A3: Please use the ATQ1&w&w1<CR> command.
Q4: Have you experienced unreliable communication with certain modems?
A4: Yes. Several generic brands tend to throw hot signals (i.e. strong signal levels) on the line. This causes the cellular service to over-modulate, which leads to distortions and results in unreliable connections.
Q5: What is the solution?
A5: We recommend that you use modems that support MNP-10 and also allow transmit level to be reduced to between –15 dbm à –20 dbm. Rockwell based modem designs generally meet these requirements. For Rockwell based modems, please try the following commands on the land line modem:
· AT-SEC=1,18 <CR>. This will enable MNP 10 and set transmits level to –18 dbm.
· AT+MS=11,1,1200,2400X3&W&W1<CR>. Sets the modem to communicate between 1200 and 2400 bps.
Q6: Is there any simple way to avoid frequent loss of connection?
A6: Please program the CMM 900-3W as follows AT+MS=11,1,1200,1200&W&W1<CR> This will force the CMM 900-3W to connect only at 1200 bps.
Q7: What initialization string is recommended to communicate with non-MNP modems?
A7: Connection with non-MNP landline modems is not recommended.
Q8: Is there any recommended init string for various land line mode.
A8: The following have been tried with excellent results.
a) For US Robotics / 3 Com modems:
ATS10=200&A3&B1&N2&U2&W&W1 <CR>
b) For Rockwell chip set based land-line modems 33600 and lower
AT%E2\N2S7=60S10=200+MS=11,1,1200,2400&w&w1 <CR>
c) For most other brands:
ATN0S37=6S10=200&w&w1 <CR>
d) For Rockwell chip set based land-line modems 56K V90 models AT%E2\N2S10=200S7=60+MS=V34,1,1200,2400,1200,2400 <CR>
Q9: My requirement (s) are totally unique. Do you offer custom solutions?
A9: Yes.
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