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CMM 900-3W USER GUIDE

AMPS Cellular Modem Module (3W)

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Summary of Contents for CMM 900-3W

Page 1: ...Page 1 of 1 CMM 900 3W USER GUIDE AMPS Cellular Modem Module 3W ...

Page 2: ... AND CONFIGURING THE MODEM 7 4 1 DIP Switch Settings 7 4 2 Initializing the Cellular Modem 7 4 3 Activating the Cellular Modem 8 4 4 Using the Cellular Modem to Communicate 8 5 THEORY OF OPERATION 9 5 1 Command State 9 5 1 1 Command guidelines 9 5 1 2 Result Codes 11 5 2 On line State 12 5 3 Transitioning Online State à Command State 12 6 SUPPORTED AT COMMANDS 13 6 1 AT Commands common to all mode...

Page 3: ... System for Mobile Communications CMM 900 3W has RS232 interface and supports the popular AT command set normally associated with modems Optionally TTL interface is also available Figure 1 CMM 900 3W 1 1 Features Uses AMPS Circuit Switched Cellular network for data transmission User friendly modem AT command set Choice of TTL or RS 232 serial interface Choice of Hardware or Software Flow Control I...

Page 4: ...Page 4 of 4 Requires 5 Volts DC 1500 ma ...

Page 5: ...ket Data Radio SCADA and Telemetry Systems Remote gas water electric meter readings Factory Automation systems Vending Machines 1 4 Your package includes CMM 900 3W unit Power supply and antenna are optional RS 232 Cable DB9 M F This USER GUIDE Pin No Signal Name Input Output 1 DCD Output 2 RXD Output 3 TXD Input 4 DTR Input 5 GND 6 DSR Output 7 RTS Input 8 CTS Output 9 RI Output ...

Page 6: ...obile 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 3 2 Registering the Cellular Modem Unit To register your cellular modemunit do the following Contact your cellular service provider Provide the cellular operator with the ESN...

Page 7: ... supply Please take precaution that the polarity of the applied voltage is correct Step 2 Connect the Cellular Modem to the PC using the RS 232 cable provided Step 3 Connect the Antenna to Cellular Modem Step 4 Click the HyperTerminal icon on the PC or select Start Programs Accessories Hyper Terminal Hyperterm exe The Connection Description Dialog Box opens Step 5 In the name field enter Cellular ...

Page 8: ...dware setup and configuration is OK 4 3 Activating the Cellular Modem To activate perform the following steps Step 1 Enter AT TEST CR The unit responds OK Step 2 Enter AT MIN Allocated_MIN CR The unit responds OK Step 3 Enter AT SID Allocated_SID CR The unit responds OK Step 4 Enter AT SYS 00 CR will select system B only or 01 CR will select system A only or 02 CR SID will determine preferred syst...

Page 9: ...nds Step 7 Repeat steps 2 to 5 5 THEORY OF OPERATION The cellular modemis always in one of the following two states Command state or Online state 5 1 Command State The Cellular Modem assumes the Command state when it is turned ON In this state you can configure the unit for a particular application In the Command State all inputs from the PC are treated as commands 5 1 1 Command guidelines Command...

Page 10: ...Page 10 of 10 Note Commands entered incorrectly or with out of range parameters will result in an ERROR message Commands entered correctly will result in OK message ...

Page 11: ...odem responses are shown below Terse Mode Verbose Mode Description 0 OK Command executed without errors 1 Connect Connection at 300 bps 2 Ring Ringing signal detected 3 No Carrier Carrier lost or never present 4 Error Invalid command 5 Connect 1200 Connection at 1200 bps 6 No Dial tone Cellular service not available 7 Busy Called party on line 8 No Answer 9 Connect 0600 10 Connect 2400 11 Connect ...

Page 12: ... cellular modemis in Online state All serial data presented to the radio is transmitted over the air DO NOT change communication parameters e g baud rate in this mode To go back to Command State Escape Sequence described below is required 5 3 Transitioning Online State à à Command State The sequence of characters to transition from Online State to the Command State is called the escape sequence Fo...

Page 13: ...odes Command Action ATZ CR Resets the modem The unit responds with OK message ATO CR Go on line This is done after the state of the unit is changed from on line to command state ATO then puts the unit back into online state ATDT XXXX CR Cell modem dials out XXXX is the phone number AT TEST CR Puts the unit in test mode Note The commands AT SYS AT MIN AT SID and AT ID can be entered only when the u...

Page 14: ...lizes ATV0 Unit responds in terse mode Results code is displayed as digits ATV0 W W1 Above command stored in non volatile memory On power up the modem will be in terse mode ATV1 Unit responds in verbose mode Results codes are displayed as messages ATV1 W W1 Above command stored in non volatile memory On power up the modem will be in verbose mode ATS0 Default is 0 If 0 then the unit will not answer...

Page 15: ...SI level If it is low 95 dbm positioning the antenna vertically should improve it 5 If remote landline modem connection drops frequently please have the calling party set S7 60 S10 register to 200 This will make the modem more tolerant of the noise hits This can be done as follows ATS0 1S7 60S10 200 W W1 CR If for some reason the CMM 900 3W unit is not responding please try the command AT F W W1 C...

Page 16: ...gnal 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 follow...

Page 17: ... 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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