Confidential
USERS MANUAL
74(158)
Document number
Revision
1/198 17-4/FCP 101 3045 Uen
D
Parameter
Description
38400
Baud rate 38400
57600
Baud rate 57600
115200
Baud rate 115200
230400
Baud rate 230400
4.8.17
AT*EMUX (Setup Multiplexer) ***Future Implementation***
Description
Syntax
Possible Responses
Sets the feature
AT*EMUX=<setting>
OK
Reads the current setting
AT*EMUX?
*EMUX: <setting>
OK
The serial port multiplexer functionality is not currently supported in the CM52. There are provisions
in place to provide this functionality at a later date, but at the time of this document release the
multiplexer functionality is NOT supported.
This command enables/disables the multiplexer on the serial port. All communication with the module must be
in the form of multiplexer packets when enabled. The CM52 remains in multiplexing mode until the user sends
the command AT*EMUX=0 through a multiplexer packet. The CM52 multiplexer provides dedicated channels
for AT commands, unsolicited messages, and data.
Multiplexing is not persistent. As a result, it is not saved after a power cycle.
Parameter
Description
<setting>
Whether multiplexer is active or not.
0 (default)
Multiplexer not active
1 Multiplexer
active
4.8.17.1 Multiplexer
Packet
Format
Parameter
Octets
Notes
Start Flag (0x81)
1
Always 0x81
Control
1
See Control Format Table
Sequence Number
1
Range: 0x00 – 0x0F. Required for Flow Control when Frame Type
= 2 or 3.
Data Length
1
Determines data payload size
Data Payload
0-255
16-Bit CRC
2
LSB sent first. Required for Error checking when Frame Type = 3.
End Flag (0x81)
1
Always 0x81
The CRC bits are optional. They are required only if the user requests CRC error checking. CRC Error
checking is requested by setting the Frame Type bits to 3 in the Control Octet. See the Table below.
Control Octet Format:
Parameter
Bits
Notes
Frame Type
4
Description of packet frame. See Frame TypeTable
More
1
Packet is fragmented. More to come.
Channel
3
Channel designation for this frame. See Table below.