Quectel UC15 MUX User Manual
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UMTS/HSPA Module SeriesUC15 MUX User GuideUC15_MUX_User_Guide Confidential / Released 33 / 35DLC 0, to indicate refusing toaccept anything on DLC 1F92MS sends MSC message with FCbit set to 0 through control channelDLC 0, to indicate recovery of DLC1 data transmissionTE←MSF9 01 EF 0B E307 07 8D 01 79F93TE sends MSC message with FCbit set to 1 through control channelDLC 0, to indicate refusing toaccept anything on DLC 1TE→MSF9 01 EF 0B E307 07 8F 01 79F94TE sends MSC message with FCbit set to 0 through control channelDLC, to indicate recovery of DLC 1data transmissionTE→MSF9 01 EF 0B E307 07 8D 01 79F95TE sends FCoff message throughDLC 0, to indicate refusing toaccept anything on all DLC exceptDLC 0TE→MS F9 01 EF 05 6301 93 F96TE sends FCon message throughDLC 0, to indicate recovery of datatransmissionTE→MS F9 01 EF 05 A301 93 F96.6. SynchronizationAfter successful establishment of data channels, TE and MS are synchronized and data transmission isnormal. Every transmission is implemented by frames which begins with a starting flag (0xF9) and endswith a closing flag (0xF9). So it is called that multiplexer is synchronized with flag 0xF9. Transmitting bytesother than 0xF9 between frames is considered as faulty or synchronization lost and needs re-sync.No Step Data Direction Hex Comment1 TE receives error frame TE←MS F9 01 EF 052 TE sends sync flag to re-syncwith MS TE→MS F9 F9 F93MS feeds back four hex valueF9 to indicate illegal bytesreceived and needs re-syncTE←MS F9 F9 F94TE tests AT commandtransmission through DLC 1after re-syncTE→MS F9 05 EF 07 41 540D 06 F9MS feeds back response and TE←MS F9 05 EF 07 41 54QuectelConfidential |
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