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4. ASCII Pass-through Configurations

This section describes the supported features of the ASCII pass-through configuration, including AT commands,

AT registers, baud rates, and factory defaults.

4.1 Supported AT Commands

Table 2 lists the supported AT commands.

Command

+++

ATO

ATSr?

ATSr=

ATZ

AT&F

AT&MBM

AT&MBS

AT&MBC

Note: When running ASCII pass-through firmware for the first time, it is important to run the AT&F command fol-

lowed by the ATZ command. This is required to write ASCII-specific default settings to the Flash memory.

4.2 Supported AT Registers

Table 3 lists the supported AT registers.

Note that register numbers 100 and above may be used for advanced physical-level PLC configuration. The altera-

tion of these parameters from their default values is usually not required. However, in challenging circumstances,

e.g. high interference or noise, this may be an option. The applicability and meaning of such settings depends on

the PLC protocol. For more information, refer to the documents listed in Section 7, References, or contact Semi-

tech Semiconductors should fine tuning of the physical parameters be required.

UART baud rate (37 is standard allocation for this purpose).

100-200

PLC PHY configuration parameters.

100

Modulation code, 0 to 6.

101

Bits per baud.

102

Number of repetitions.

103

Number of frequencies.

104

Convolution code enable.

1: enable

0: disable

105

Tone map. A bit map containing a list of the sub-bands (groups of tones) that are either active (bit set to 1) or

inactive (bit set to zero). A bit in the bit map represents a group of consecutive tones and the number of tones

per group depends on the band plan.

106

Coherent mode.

1: enable

0: disable

Table 2. Supported AT Commands

Switch to command mode.

Switch to data (string tx) mode; this command ends with Satin letter "O", not with zero.

Get Register r.

Set Register r.

Reboot device.

Restore Factory Defaults (most defaults depend on PHY, see below).

Make master.

Make slave (requires address as argument).

Run given command.

Table 3. Supported AT Registers

Description

SM2400 Serial-to-PLC Adapter User's Guide

UG-SM2400–-177A–-02/2019