Modem Communications-- System Bits and Integers

Relevant System Bits, System Integers, and Modem Error Messages are listed below.

Modems: General

System Bits
SB	Symbol	Description
72	Initialize Modem	Causes modem initialization. Remains ON until initialization is complete, then turns off. Note that: This SB turns ON at power-up. You can disable this SB at power-up to avoid initializing the modem. You may use this SB to initialize the modem at any point during your application.
73	Modem Initialization: Succeeded	Signals that modem has been initialized. When SB 73 is ON, PLC is ready to both make and receive calls.
74	Modem Initialization: Failed	Signals that modem initialization failed. SI 70 contains the error code.
75	Modems Connected	Turns ON when connection is established
76	Disconnect Modem	Ends call (hang-up)
77	Dial Remote Modem	Dials the phone number represented by the index number stored in SI 71

System Integers
SI	Symbol	Description
70	Modem: Error Code	Contains an error code resulting from a modem error. The list is shown below.
71	Modem: Phone Number	Contains the phone number to be dialed. You create a phone book when you configure the modem. Each phone number in the phone book is linked to an index number. Use the Store Direct function to place the index number of desired phone number in SI 71, then activate SB 77 to dial it.

Error Messages ( SI 70)
Number	Error Message	Description
0	No Error	No error.
1	No Carrier	No carrier signal found--reason unknown. Check your communication cables.
2	Modem Did Not Reply	The modem referred to is the one on the PLC side.
3	No Dial Tone	No dial tone.
4	Line is Busy	The number dialed is engaged.
5	No Carrier While Dialing	Carrier signal was lost during dialing.
6	Modem Report Error	May be due to an incorrect number or unknown initialization commands.
7	Modem Report Unknown Message	An unrecognized message.
8	No Phone Number	SI 71 contains a number that is not linked to any phone number stored in the phone book.
9	RS232 Port Busy	The RS232 port is already in use.

SMS System Bits and Integers

Listed below are the System Bits, System Integers, and Error Messages that are used by the PLC in SMS messaging.

System Bits
SB	Symbol	Description
180	Initialize GSM Modem for SMS	Turn this ON to enable SMS messaging.
181	SMS: Initialization Succeeded	Signals that GSM modem has been initialized. The modem is now ready to send and receive SMS messages.
182	SMS: Initialization Failed	Signals that GSM modem has failed. SI 180 contains the error code.
183	Send SMS	Send the string that is represented by the index number stored in SI 182, to the phone number represented by the index number stored in SI 181.
184	SMS: Transmission succeeded	Signals that SMS has been successfully transmitted
185	SMS: Transmission Failed	Signals that SMS has failed. SI 180 contains the error code
186	SMS Received	Signals that a defined SMS has been received. SI 183 contains the index number identifying the origin of the SMS, if this number has been stored in the SMS phone book. If the number is not found, SI 183 equals 0. SI 184 contains the index number of the SMS string that has been received. Only messages that have been defined in the SMS messages list can be received by the PLC.
187	Error in Received SMS	This bit signals one of the errors listed below. SI 180 contains the error code.
188	Ignore Received SMS	Allows the user to block reception of SMS messages
189	Print SMS message	This prints a message with CR (Carriage Return) & LF (Line Feed)
190	Print SMS message	This prints a message with LF (Line Feed)
191	Print SMS message	This prints a message without CR (Carriage Return) or LF (Line Feed)
192	Get GSM antenna signal quality	Get GSM antennae signal quality. The signal quality is contained in SI 185 GSM Signal Quality.
193	Delete SMS messages from SIM	Deletes SMS messages from the SIM card. When used alone, the default number of messages is 20. Using SB 193 in conjunction with SI 187, Number of SMS messages to be deleted, enables you to delete up to 30 SMS messages.
194	Print SMS message	This prints a message including STX and ETX.

System Integers
SI	Symbol	Description
180	SMS Error Code	Contains an error code resulting from a SMS error. The list is shown below
181	SMS: Send to Phone Number	Contains the index number of a phone number within the GSM phone book. Use the Store Direct function to place the index number of the desired phone number in SI 181. Storing the value '0' into SI 181 causes a message to be sent to the last number to which an SMS message was sent. When auto-acknowledge is selected, the number 7 will be automatically placed into S1 181 when the SMS is acknowledged.
182	SMS: String Number to Send	Contains the index number that represents the SMS string to be sent. Use the Store Direct function to place the index number of the desired SMS string in SI 182.
183	Origin of Received SMS	Contains the index number that represents the phone number from which the SMS was sent. If this number is not defined in the GSM phone book, SI 183 will contain 0.
184	Received SMS String	Contains the index number that represents the SMS that has been received. If this number is not defined in the SMS message list, SI 184 will contain 0.
185	GSM Signal Quality	GSM antenna signal quality. If this is less than 11, reposition the antenna. You can use SB 192, Get GSM antennae signal quality,together with this SI.
187	Number of SMS messages to be deleted	Using SB 193 in conjunction with the new SI 187, Number of SMS messages to be deleted, enables you to delete up to 30 SMS messages.

Error Messages (SI 180)
Number	Error Message	Description
0	No error	No error found
1	GSM Modem Not Initialized	The GSM modem was not initialized. Before using the SMS feature the modem must be initialized. Refer to relevant help sections.
2	GSM Modem Did Not Reply	The GSM modem referred to is the one on the PLC side.
3	Modem Reports Unknown Message	Modem returns an unrecognized reply
5	Wrong PIN number	The Personal Identification Number that was given does not match that of the SIM card installed in the PLC's GSM modem.
6	Failed Registration	GSM modem did not register successfully, for example if no network was found, or if the modem antenna is not functioning.
7	No Phone Number	SI 181 contains a number that is not linked to any phone number stored in the GSM phone book.
8	Transmit: Undefined String number	SI 182 contains a string number that is not linked to any string number stored in the SMS Messages List.
9	Unauthorized Origin	This SMS string has been transmitted from an unauthorized phone number.
11	Illegal String Received	The string received is not linked to any string stored in the SMS Messages List. SI 184 will contain 0.
14	RS232 Port Busy	The RS232 port is already in use; for example, the modem is currently connected.
16	SMS not successfully sent to all numbers	The SMS message was not successfully sent to all the phone numbers for which it was configured.
17	PUK number needed	The SIM card is locked due to too many attempts to enter an incorrect PIN number.