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HUAWEI CDMA Datacard Modem AT Command Interface Specification
This manual introduces the AT commands supported by HUAWEI CDMA DATA
CARD, including the commands based on standard and extended AT commands
developed by Huawei. This manual does not include commands that are
implemented by Qualcomm while not required by the CDMA DATA CARD. The AT
interface description only covers packets as well as the usage and
process for TE and MS. DIAG interfaces are not introduced in this
manual. It is recommended not to implement interfaces that are not
referred in this manual or are not supported currently.
AT commands are packets transmitted through telecommunications ports. There is limitation on the size of packets. Except the two characters “AT”, an AT command can carry no more than 260 characters (including null characters). Both a response and an unsolicited result code (URC) can contain no more than 668 characters. Each command line contains only one AT command. An URC or a response reported by MS to TE can have only one AT command. Use a return character as the end of a command line. In principal, you are not allowed to use S3/S4 format to modify a command.
The principal applies to boards and personal computer (PC) programs. For AT commands need longer response time, a response can be reported in an asynchronous mode to ensure the normal running of other commands. If it takes longer for MS to respond to TE, the response may be disrupted by a URC. The interruption comprises of two situations. The first is that URC is reported after you execute an AT command and wait for the response. After the URC is reported, the AT commands are being processed and the response will be reported. The second situation is that during the execution of AT commands, an URC is reported. The URC and response may be reported together. In some circumstance, RING can e used as terminal characters. For example, during the response waiting procedure after a hang up command is executed, a RING is reported, and then the hang up command abends.
download HUAWEI CDMA Datacard Modem AT Command Interface Specification here
HUAWEI CDMA Datacard Modem AT Command Interface Specification
AT commands are packets transmitted through telecommunications ports. There is limitation on the size of packets. Except the two characters “AT”, an AT command can carry no more than 260 characters (including null characters). Both a response and an unsolicited result code (URC) can contain no more than 668 characters. Each command line contains only one AT command. An URC or a response reported by MS to TE can have only one AT command. Use a return character as the end of a command line. In principal, you are not allowed to use S3/S4 format to modify a command.
The principal applies to boards and personal computer (PC) programs. For AT commands need longer response time, a response can be reported in an asynchronous mode to ensure the normal running of other commands. If it takes longer for MS to respond to TE, the response may be disrupted by a URC. The interruption comprises of two situations. The first is that URC is reported after you execute an AT command and wait for the response. After the URC is reported, the AT commands are being processed and the response will be reported. The second situation is that during the execution of AT commands, an URC is reported. The URC and response may be reported together. In some circumstance, RING can e used as terminal characters. For example, during the response waiting procedure after a hang up command is executed, a RING is reported, and then the hang up command abends.
download HUAWEI CDMA Datacard Modem AT Command Interface Specification here
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