thor-emitter/docs/COMMUNICATION_GUIDE.md

NL-43 / NL-53 Communication Guide (Concise + Full Reference)

Single-file quick reference for the NL-43/NL-53 Communication Guide (No. 66132, pages ~1–97). Use the official PDF for authoritative details, exact formatting, and option requirements.

Protocol Basics

• ASCII commands terminated with CR LF.
• Setting: $Command,Param[CR][LF]; Request: Command?[CR][LF].
• Wait for $ prompt/idle before the next command; recommended ≥1 s between commands.
• Result codes: R+0000 success; 0001 command error; 0002 parameter error; 0003 spec/type error; 0004 status error (wrong state).
• Control codes: CR=0x0D, LF=0x0A, SUB=0x1A (stop DRD stream).
• Timing: responds within ~3 s; characters ≤100 ms apart; DRD streams until SUB.

Transport Modes

• USB CDC: Serial over USB (mutually exclusive with LAN TCP/FTP/web/I/O port comm).
• RS-232C: 9600–115200 bps; DRD streaming needs ≥19200 (EX) or ≥57600 (RT).
• LAN (NX-43EX): TCP control, FTP, web app (ports 80 & 8000). TCP/FTP/Web are mutually exclusive with each other and with USB comm while active.

Quick Startup Checklist (TCP control)

1. Install NX-43EX; on device: Ethernet On; DHCP On or set IP/Subnet/Gateway; TCP, On; ensure USB comm + web app + I/O port comm are Off.
2. Ensure reachability to device IP:TCP port (default 80).
3. Clock,<timestamp> to sync time.
4. Configure mode/intervals, then Measure, Start.
5. Poll DOD? (≥1 s) or stream DRD?status; stop with SUB.
6. Toggle FTP, On only when pulling SD files; then back to TCP, On.

LAN / USB / Web / FTP (NX-43EX)

Command	Purpose	Type	Notes / Params
Ethernet	LAN on/off	S/R	`Ethernet, On
Ethernet DHCP	DHCP on/off	S/R	`Ethernet DHCP, On
Ethernet IP	Set IP	S/R	Ethernet IP, a.b.c.d (p84)
Ethernet Subnet	Set subnet	S/R	Ethernet Subnet, a.b.c.d (p84)
Ethernet Gateway	Set gateway	S/R	Ethernet Gateway, a.b.c.d (p85)
TCP	TCP control	S/R	`TCP, On
FTP	FTP transfer	S/R	`FTP, On
Web	Web app	S/R	`Web, On
USB Class	USB comm/mass storage	S/R	`USB Class, Off

Data Output Commands (fields)

• DOD?: Snapshot; main/sub channel Lp, Leq, LE, Lmax, Lmin, LN1–LN5, Lpeak, LIeq, Leq,mov, Ltm5, over/under flags. RT variant may include band/POA data; wait ≥1 s between requests.
• DRD?: Continuous every 100 ms; counter + main/sub Lp/Leq/Lmax/Lmin/Lpeak/LIeq + over/under. Stop with SUB (0x1A). Baud constraints on RS-232C only.
• DRD?status: DRD payload + timestamp, power source (I/E/U), battery level (F/M/L/D/E), SD remaining MB, measurement state (M/S).
• DLC?: Final calculation set (similar to DOD); RT variant includes band data + over/under flags.

Condensed Command List (Section 5.6)

Command	Function	Type	Notes / Page
Communication Echo	Echo on/off	S/R	p39
System Version	Version info	R	p39
Type	Model type	R	p39
Serial Number	Serial number	R	p39
Clock	Current time	S/R	p40
Language	Display language	S/R	p40
Index Number	Index	S/R	p40
Key Lock	Key lock	S/R	p41
Backlight	Backlight status	S/R	p41
Backlight Auto Off	Auto off	S/R	p41
LCD	LCD status	S/R	p41
LCD Auto Off	Auto off	S/R	p42
Backlight Brightness	Brightness	S/R	p42
Battery Type	Battery type	S/R	p42
Battery Level	Battery level	S/R	p43
SD Card Total Size	SD total	R	p43
SD Card Free Size	SD free	R	p43
SD Card Percentage	SD free %	R	p43
Output Level Range Upper	Bar upper	S/R	p44
Output Level Range Lower	Bar lower	S/R	p44
Display Leq / LE / Lpeak / Lmax / Lmin	Display flags	S/R	p44–45
Display LN1–LN5	Percentiles display	S/R	p45–46
Display LIeq / Ltm5 / Leqmov	Display flags	S/R	p47
Time Level Time Scale	Time-level scale	S/R	p47
Display Calculate Type (RT)	Calc type	S/R	p48
Measure Display Sub Channel 1–3	Sub displays	S/R	p49
Octave Mode (RT)	Analysis mode	S/R	p49
Additional Band (RT)	Sub band	S/R	p49
Display Partial Over All (RT)	POA on/off	S/R	p50
Upper/Lower Limit Frequency (+Offset) (RT)	POA bands	S/R	p50–52
Lmax Type / Channel	Lmax/Lmin settings	S/R	p52
Frequency Weighting (Main/Sub1–3)	Weighting	S/R	p53
Frequency Weighting (Band) (RT)	Band weighting	S/R	p53
Time Weighting (Main/Sub1–3)	Time weighting	S/R	p54
Time Weighting (Band/Band2) (RT)	Band time weighting	S/R	p55
Windscreen / Diffuse Correction	Corrections	S/R	p55–56
Ldiff1/Ldiff2 (+Channel/Calc) (RT)	Differential	S/R	p56–57
Store Mode / Name / Manual Address	Storage setup	S/R	p58
Measure	Start/Stop measure	S/R	p58
Pause	Pause	S/R	p59
Manual Store	Manual store	S	p59
Overwrite	Overwrite check	S/R	p59
Measurement Time Preset Manual / Manual (Num/Unit)	Manual timing	S/R	p60
Measurement Time Preset Auto / Auto (Num/Unit) (EX)	Auto timing	S/R	p61
Lp Store Interval	Lp interval	S/R	p62
Leq Calculation Interval Preset / Num / Unit	Leq interval	S/R	p62–63
Store Delay Time	Delay	S/R	p63
Back Erase	Back erase	S/R	p63
Timer Auto Start/Stop Time	Timer	S/R	p64
Timer Auto Interval (EX)	Timer interval	S/R	p65
Sleep Mode	Sleep	S/R	p65
Trigger Mode	Trigger	S/R	p65
Level Trigger Channel (EX)	Trigger channel	S/R	p66
Level Trigger Band Freq/Offset (RT)	Band trigger	S/R	p66–67
Level Trigger Level (EX)	Trigger level	S/R	p67
Moving Leq Interval Preset / Num / Unit	Moving Leq	S/R	p67–68
TRM	LN mode sampling	S/R	p68
Percentile 1–5	LN percentiles	S/R	p69
Lp Mode (RT)	Lp type	S/R	p69
Wave Rec Mode / Sampling Freq / Bit Length (WR)	Waveform	S/R	p70
Frequency Weighting (Wave)	Wave weighting	S/R	p71
Wave Rec Range Upper / State	Wave status	S/R	p71
Wave Splitting Interval	Split interval	S/R	p72
Wave Manual Rec / Pre-time	Manual rec	S/R	p72
Wave Level Rec / Trigger Channel (WR/RT)	Level rec	S/R	p73
Wave Level Trigger Band Freq/Offset (RT)	Band trigger	S/R	p73–74
Wave Level Trigger Level / Pre-time / Max Time	Thresholds	S/R	p74–75
Wave Level Reference Time/Level (1–4)	Time-zone thresholds	S/R	p75–76
Wave Interval Rec (Interval/Time)	Interval rec	S/R	p76–77
I/O AC OUT	AC output	S/R	p78
AC Out Band Freq/Offset (RT)	AC band	S/R	p78–79
I/O DC OUT	DC output	S/R	p79
DC Out Band Freq/Offset (RT)	DC band	S/R	p80
Output Range Upper	Electrical full scale	S/R	p81
Reference Signal Output	Reference signal	S/R	p81
IO Func	IO port	S/R	p81
Baud Rate	RS-232C baud	S/R	p82
Comparator Channel	Comparator channel	S/R	p82
Comparator Band Freq/Offset (RT)	Comparator band	S/R	p82–83
Comparator Level (EX)	Comparator level	S/R	p83
USB Class	USB comm	S/R	p83
Ethernet / DHCP / IP / Subnet / Gateway (EX)	LAN config	S/R	p84–85
Web (EX)	Web app	S/R	p85
FTP (EX)	FTP	S/R	p85
TCP (EX)	TCP control	S/R	p86
DOD / DOD (RT)	Output displayed value	R	p88–89
DRD / DRD (RT)	Continuous output	R	p90–91
DRD?status / DRD?status (RT)	Continuous + status	R	p92–93
DLC / DLC (RT)	Final calculation output	R	p94–95

Full Command Catalog (pages ~30–95)

All commands from section 5.6 listed with purpose. Types: S=Setting, R=Request. Options: (EX)=NX-43EX, (RT)=NX-43RT, (WR)=NX-43WR.

Communication / System

• Communication Echo (S/R): Echo sent command strings (p39)
• System Version (R): Version info (p39)
• Type (R): Type info (p39)
• Serial Number (R): Serial number (p39)
• Clock (S/R): Current time (p40)
• Language (S/R): Display language (p40)
• Index Number (S/R): Index (p40)

UI / Power / Storage Stats

• Key Lock (S/R): Key lock (p41)
• Backlight (S/R): Backlight status (p41)
• Backlight Auto Off (S/R): Auto off (p41)
• LCD (S/R): LCD status (p41)
• LCD Auto Off (S/R): Auto off (p42)
• Backlight Brightness (S/R): Brightness (p42)
• Battery Type (S/R): Battery type (p42)
• Battery Level (S/R): Battery level (p43)
• SD Card Total Size (R): SD total (p43)
• SD Card Free Size (R): SD free (p43)
• SD Card Percentage (R): SD free % (p43)

Display/Measure Flags

• Output Level Range Upper/Lower (S/R): Bar graph ranges (p44)
• Display Leq/LE/Lpeak/Lmax/Lmin (S/R): Flags (p44–45)
• Display LN1–LN5 (S/R): Percentiles (p45–46)
• Display LIeq/Ltm5/Leqmov (S/R): Flags (p47)
• Time Level Time Scale (S/R): Time-level scale (p47)
• Display Calculate Type (RT, S/R): Calc type (p48)
• Measure Display Sub Channel 1–3 (S/R): Sub displays (p49)

Analysis / Bands (RT)

• Octave Mode (S/R): Analysis mode (p49)
• Additional Band (S/R): Sub band (p49)
• Display Partial Over All (S/R): POA (p50)
• Upper/Lower Limit Frequency (+Offset) (S/R): POA bands (p50–52)
• Lmax Type / Channel (S/R): Lmax/Lmin settings (p52)

Weighting / Corrections

• Frequency Weighting (Main/Sub1–3) (EX, S/R): Weighting (p53)
• Frequency Weighting (Band) (RT, S/R): Band weighting (p53)
• Time Weighting (Main/Sub1–3) (S/R): Time weighting (p54)
• Time Weighting (Band/Band2) (RT, S/R): Band time weighting (p55)
• Windscreen Correction (S/R): Windscreen correction (p55)
• Diffuse Sound Field Correction (S/R): Diffuse correction (p56)

Differential (RT)

• Ldiff1/Ldiff2 (S/R): Measure differential (p56)
• Ldiff1/2 Channel1/2 (S/R): Differential channel (p56)
• Ldiff1/2 Calculation1/2 (S/R): Differential calc (p57)

Store / Measurement Control

• Store Mode (S/R): Manual/Auto (p58)
• Store Name (S/R): Storage name (p58)
• Manual Address (S/R): Manual storage address (p58)
• Measure (S/R): Start/Stop measure (p58)
• Pause (S/R): Pause (p59)
• Manual Store (S): Manual store (p59)
• Overwrite (S/R): Overwrite check (p59)
• Measurement Time Preset Manual / Manual (Num/Unit) (S/R): Manual timing (p60)
• Measurement Time Preset Auto / Auto (Num/Unit) (EX, S/R): Auto timing (p61)
• Lp Store Interval (S/R): Lp interval (p62)
• Leq Calculation Interval Preset / Num / Unit (S/R): Leq interval (p62–63)
• Store Delay Time (S/R): Delay (p63)
• Back Erase (S/R): Back erase (p63)
• Timer Auto Start/Stop Time (S/R): Timer (p64)
• Timer Auto Interval (EX, S/R): Auto interval (p65)
• Sleep Mode (S/R): Sleep (p65)
• Trigger Mode (S/R): Trigger (p65)
• Level Trigger Channel (EX, S/R): Trigger channel (p66)
• Level Trigger Band Frequency/Offset (RT, S/R): Band trigger (p66–67)
• Level Trigger Level (EX, S/R): Trigger level (p67)
• Moving Leq Interval Preset / Num / Unit (S/R): Moving Leq (p67–68)
• TRM (S/R): LN mode sampling (p68)
• Percentile 1–5 (S/R): LN percentiles (p69)
• Lp Mode (RT, S/R): Lp type (p69)

Waveform Recording (WR/RT)

• Wave Rec Mode / Sampling Frequency / Bit Length (S/R): Recording config (p70)
• Frequency Weighting (Wave) (S/R): Wave weighting (p71)
• Wave Rec Range Upper / State (S/R): Rec range/status (p71)
• Wave Splitting Interval (S/R): File split interval (p72)
• Wave Manual Rec / Pre-time (S/R): Manual rec (p72)
• Wave Level Rec / Trigger Channel (WR/RT, S/R): Level rec (p73)
• Wave Level Trigger Band Frequency/Offset (RT, S/R): Band trigger (p73–74)
• Wave Level Trigger Level / Pre-time / Maximum Recording Time (S/R): Thresholds/time (p74–75)
• Wave Level Reference Time Interval 1–4 (S/R): Time-zone intervals (p75)
• Wave Level Reference Time 1–4 (S/R): Time-zone time (p75)
• Wave Level Reference Time 1–4 Level (S/R): Time-zone level (p75–76)
• Wave Interval Rec Interval / Time (S/R): Interval rec (p76–77)

I/O and Outputs

• I/O AC OUT (S/R): AC output (p78)
• AC Out Band Frequency/Offset (RT, S/R): AC band (p78–79)
• I/O DC OUT (S/R): DC output (p79)
• DC Out Band Frequency/Offset (RT, S/R): DC band (p80)
• Output Range Upper (S/R): Electrical full scale (p81)
• Reference Signal Output (S/R): Reference signal (p81)
• IO Func (S/R): IO port (p81)

Comparator / Comms

• Baud Rate (S/R): RS-232C baud (p82)
• Comparator Channel (S/R): Comparator channel (p82)
• Comparator Band Frequency/Offset (RT, S/R): Comparator band (p82–83)
• Comparator Level (EX, S/R): Comparator level (p83)
• USB Class (S/R): USB comm/mass storage (p83)
• Ethernet/DHCP/IP/Subnet/Gateway (EX, S/R): LAN config (p84–85)
• Web (EX, S/R): Web app (p85)
• FTP (EX, S/R): FTP (p85)
• TCP (EX, S/R): TCP control (p86)

Data Output (fields)

• DOD / DOD (RT) (R): Snapshot of displayed values; includes Lp/Leq/LE/Lmax/Lmin/LN1–LN5/Lpeak/LIeq/Leq,mov/Ltm5/over-under (p88–89).
• DRD / DRD (RT) (R): Continuous every 100 ms; counter + Lp/Leq/Lmax/Lmin/Lpeak/LIeq + over/under (p90–91). Stop with SUB.
• DRD?status / DRD?status (RT) (R): DRD + timestamp, power source, battery level, SD remaining MB, measurement state (p92–93).
• DLC / DLC (RT) (R): Final calculation result set (similar to DOD; RT includes band data) (p94–95).