Revision as of 20:11, 28 January 2026

Tag: Detector Support

This article details the commands and responses that are available for external wayside detectors to retrieve AEI data from the APU102.

Transport:

Currently, this interface is available via RS232 or Ethernet. When using Ethernet, assign each detector a unique IP port to attach to. Currently, the default port is 24.

Logging in:

Once a connection is made, simply send an <ENTER>. A prompt will be returned.

For example:

Commands Supported:

TDIR – Train directory (list last 5 trains) LT94 – Consist dump in T94 (S918A;S9203) format. STAT – AEI unit status. EXIT – Exit the interface.

For an updated list of commands, type “?” at the prompt.

Example:

Typical Usage:

Once the train clears the AEI system, the APU102 processes the train and makes the final consist available to the external wayside detector unit(s). Because there is a finite period of processing required by the APU102 to produce this consist, it may take as long as two minutes after the train clears the site before a consist can be accessed (especially in multitrack territory). In most cases, it will be available within 10 seconds

To allow the external processors to be aware that processing may still be underway, a “STAT” command is available. By inspecting the “Postprocessing?” and “Acquiring” fields returned by the STAT command, the external device is able to determine if additional wait time is necessary.

In the simplest usage scenario, a defect detector accesses the AEI interface only after it has finished recording a train. In that case, the detector would simply request a periodic STAT dump from the unit, unit it is reported that “acquisition” and “post processing” is complete. At that time, the external device can issue an “LT94” command to retrieve the consist for the last train.

Interface Health Support:

To allow the APU102 to conduct simple health reporting to our customer’s maintenance hosts, the software will expect to see periodic commands issued (typically “stat”, or simply an “<enter>”). If no activity is seen for longer than 2 minutes, the APU102 will log and report a message to the customer’s maintenance host indicating the connection has been disconnected.

External Detector Command Responses:

Command: TDIR Sends up to the last 5 TDIR entries. Terminates with “EOL*LineCount” message
Ref	Field	Type	Size	Description
TDIR00	Segment ID	AN	4	“TDIR”
TDIR01	Train Seq	N	8	Train Sequence #
TDIR02	Start Date	N	8	Start Date in YY-MM-DD
TDIR03	Start Time	N	8	Start Time in HH:MM:SS
TDIR04	End Date	N	8	End Date in YY-MM-DD
TDIR05	End Time	N	8	End Time in HH:MM:SS
TDIR06	Owner Code	AN	4	Lead Loco Owner
TDIR07	Number	N	6	Lead Loco Number
TDIR08	Dir	A	1	‘<’ = R to L, ‘>’ = LtoR
TDIR09	Total Axles	A	4	Total Axles in Train
TDIR10	Total Vehicles	A	4	Total Vehicles in train
TDIR11	Total Tags	A	4	Total tag count.

Example:

Command: STAT Sends single line detailing current status.
Ref	Field	Type	Size	Description
STAT00	Segment ID	AN	4	“STAT”
STAT01	Seconds UTC	N	10	Time in seconds since UTC 1/1/70
STAT02	Local Date	N	8	Date in YY-MM-DD
STAT03	Local Time	N	8	Time in HH:MM:SS
STAT04	Acquisition Clock	N	10	Time in Ms since start of clock synch.
STAT05	Acquiring	A	1	Y/N
STAT06	Post Processing?	A	1	Y/N
STAT07	Current Axle	N	5
STAT08	Current Speed	N	4	Ft/Sec
STAT09	Current Seq	N	4	Current (or next) train seq
STAT10

Example:

Command: LT94 <SEQ #>

Sends consist information for a train. Refer to the “T94 report specification” for details concerning the format of the output.

Example:

AEI>LT94

AEM*00076*TA75511*060817*2245*2250*070*Y*411*0002*G*G*N*0*E*028*015*06334*G*03*02*105*105*0436
RRE*001*D* *0000000000*A* *G*N*K*00*00*020*06*01

RRE*002*D*CSXT*0000008518*B* *G*G*K*38*14*021*06*01

RRE*003*D*CSXT*0000005864*B* *G*G*L*35*17*015*04*01

RRE*004*R*BNSF*0000432638*A* *G*G*K*40*03*019*04*01

RRE*005*R*BNSF*0000780578*A* *G*G*K*38*18*019*04*01

RRE*006*R*BNSF*0000782917*B* *G*G*K*36*15*019*04*01

RRE*007*R*DMIX*0000190145*A* *G*G*K*40*19*020*04*01

RRE*008*R*GATX*0000073427*A* *G*G*K*38*18*020*04*01

RRE*009*R*CSXT*0000130078*B* *G*G*K*40*14*021*04*01

RRE*010*R*RBOX*0000040426*A* *G*G*P*37*18*021*04*01

RRE*011*R*CSYX*0000013492*A* *G*G*K*35*14*020*04*01

RRE*012*R*CEFX*0000011185*A* *G*G*K*35*11*021*04*01

RRE*013*R*CEFX*0000011164*A* *G*G*K*34*02*021*04*01

RRE*014*R*CEFX*0000012279*B* *G*G*K*35*08*021*04*01

RRE*015*R*CEFX*0000012241*A* *G*G*L*35*11*021*04*01

RRE*016*R*UELX*0000030024*A* *G*G*K*36*13*022*04*01

RRE*017*R*ADMX*0000085135*B* *G*G*K*31*17*022*04*01

RRE*018*R*UELX*0000100029*B* *G*L*K*32*00*022*04*01

RRE*019*R*UELX*0000030332*B* *G*G*K*38*14*022*04*01

RRE*020*R*AGPX*0000095235*B* *G*G*K*29*13*022*04*01

RRE*021*R*TILX*0000512211*B* *G*G*K*33*21*023*04*01

RRE*022*R*CRDX*0000014293*B* *G*G*K*30*13*022*04*01

RRE*023*R*AEX *0000006514*B* *G*G*K*32*07*023*04*01

RRE*024*R*HPJX*0000015051*B* *G*G*K*29*16*023*04*01

RRE*025*R*MMID*0000005059*B* *G*G*K*31*01*023*04*01

RRE*026*R*CSXT*0000228209*B* *G*G*K*31*17*023*04*01

RRE*027*R*CSXT*0000223017*B* *G*G*K*33*15*024*04*01

RRE*028*R*CSXT*0000226487*A* *G*G*K*32*15*023*04*01

RRE*029*R*CSXT*0000222012*B* *G*G*K*33*12*024*04*01

RRE*030*R*SSAM*0000043512*B* *G*G*K*30*15*025*04*01

RRE*031*R*CNA *0000555065*B* *G*G*K*31*14*025*04*01

RRE*032*R*BCOL*0000041799*B* *G*G*K*33*15*025*04*01

RRE*033*R*IC *0000624463*A* *G*G*K*29*14*024*04*01

RRE*034*R*SRY *0000318278*A* *G*G*K*24*15*024*04*01

RRE*035*R*ATW *0000300134*B* *G*G*K*30*16*025*04*01

RRE*036*R*CSXT*0000227184*A* *G*L*K*00*18*025*04*01

RRE*037*R*CSXT*0000228251*A* *G*G*K*28*12*025*04*01

RRE*038*R*CSXT*0000220682*B* *G*G*K*23*09*025*04*01

RRE*039*R*CSXT*0000227268*B* *G*G*K*27*13*025*04*01

RRE*040*R*CO *0000604922*B* *G*G*K*30*03*025*04*01

RRE*041*R*BO *0000605218*A* *G*G*K*29*08*025*04*01

RRE*042*R*NYC *0000883927*B* *G*G*K*28*06*025*04*01

RRE*043*R*CSXT*0000228059*A* *G*G*K*30*11*026*04*01

RRE*044*R*GATX*0000030055*A* *G*G*K*30*15*026*04*01

RRE*045*R*CSXT*0000137183*B* *G*G*K*30*16*026*04*01

RRE*046*R*ETCX*0000000926*B* *G*G*K*29*13*025*04*01

RRE*047*R*ETCX*0000052031*B* *G*G*K*29*08*026*04*01

RRE*048*R*ETCX*0000000911*B* *G*G*K*30*12*026*04*01

RRE*049*R*ETCX*0000001074*A* *G*G*K*30*13*026*04*01

RRE*050*R*NAHX*0000800254*B* *G*G*K*28*17*026*04*01

RRE*051*R*ATW *0000114033*A* *G*G*P*27*15*027*04*01

RRE*052*R*SOU *0000085042*B* *G*G*K*23*09*025*04*01

RRE*053*R*XTTX*0000137248*A* *G*G*K*03*10*026*04*01

RRE*054*R*AEX *0000009055*B* *G*G*K*29*04*026*04*01

RRE*055*R*NAHX*0000060730*A* *G*R*K*28*00*026*04*01

RRE*056*R*IC *0000010093*A* *G*G*K*27*07*026*04*01

RRE*057*R*TTJX*0000081671*B* *G*G*K*30*16*026*04*01

RRE*058*R*AEX *0000004142*B* *G*G*K*27*12*026*04*01

RRE*059*R*AEX *0000007490*A* *G*G*K*24*11*026*04*01

RRE*060*R*TIMX*0000062024*A* *G*G*K*33*11*026*04*01

RRE*061*R*TIMX*0000062002*A* *G*G*K*26*16*026*04*01

RRE*062*R*EEC *0000000818*A* *G*G*K*29*15*027*04*01

RRE*063*R*AOK *0000021548*B* *G*G*K*26*13*026*04*01

RRE*064*R*AOK *0000029817*B* *G*G*K*25*10*026*04*01

RRE*065*R*TTZX*0000087558*A* *G*G*K*24*16*026*04*01

RRE*066*R*NOKL*0000732566*B* *G*G*K*10*08*026*04*01

RRE*067*R*CN *0000625334*B* *G*G*K*23*11*027*04*01

RRE*068*R*ABOX*0000052094*B* *G*G*K*29*14*027*04*01

RRE*069*R*ABOX*0000051922*B* *G*G*K*26*15*028*04*01

RRE*070*R*ABOX*0000052018*B* *G*G*K*28*15*027*04*01

RRE*071*R*NW *0000178393*A* *G*G*K*22*10*026*04*01

RRE*072*R*RFMX*0000464339*B* *G*G*K*28*03*026*04*01

RRE*073*R*SIRX*0000460326*A* *G*G*K*29*02*026*04*01

RRE*074*R*CRDX*0000004845*A* *G*G*K*28*13*026*04*01

RRE*075*R*CHVX*0000889374*A* *G*G*K*31*14*026*04*01

RRE*076*R*CHVX*0000890226*A* *G*G*K*21*12*026*04*01

RRE*077*R*PSPX*0000006162*A* *G*G*K*29*11*026*04*01

RRE*078*R*CSXT*0000292015*B* *G*G*K*31*07*026*04*01

RRE*079*R*AEX *0000004133*B* *G*G*K*27*11*026*04*01

RRE*080*R*CSXT*0000251152*B* *G*G*K*27*04*026*04*01

RRE*081*R*NCHX*0000046090*A* *G*R*K*27*00*026*04*01

RRE*082*R*ACFX*0000064791*A* *G*R*P*29*00*026*04*01

RRE*083*R*NDYX*0000827685*B* *G*G*K*19*02*026*04*01

RRE*084*R*ATW *0000113151*B* *G*G*K*31*14*027*04*01

RRE*085*R*GVSR*0000782018*A* *G*G*K*27*18*027*04*01

RRE*086*R*EEC *0000002094*A* *G*G*K*31*13*026*04*01

RRE*087*R*RBOX*0000032673*A* *G*G*K*23*15*027*04*01

RRE*088*R*TTZX*0000085477*A* *G*G*K*22*15*025*04*01

RRE*089*R*BCOL*0000873518*A* *G*G*K*21*13*025*04*01

RRE*090*R*WC *0000037150*B* *G*G*K*14*10*025*04*01

RRE*091*R*WC *0000037653*A* *G*G*K*27*12*025*04*01

RRE*092*R*CNIS*0000623214*B* *G*G*K*26*14*025*04*01

RRE*093*R*HOKX*0000112086*B* *G*G*K*31*15*025*04*01

RRE*094*R*FMLX*0000051685*B* *G*G*K*26*12*025*04*01

RRE*095*R*CSXT*0000485038*B* *G*R*L*00*08*025*04*01

RRE*096*R*CSXT*0000705742*A* *G*G*K*29*12*025*04*01

RRE*097*R*CSXT*0000486398*B* *G*G*K*21*16*025*04*01

RRE*098*R*RBOX*0000043652*A* *G*G*K*23*16*025*04*01

RRE*099*R*SOU *0000530948*B* *G*G*K*32*14*025*04*01

RRE*100*R*CN *0000407054*A* *G*G*K*28*11*025*04*01

RRE*101*R*GMRC*0000021085*B* *G*G*K*32*14*025*04*01

RRE*102*R*MEC *0000032144*B* *G*G*K*30*15*025*04*01

RRE*103*R*CVC *0000402528*A* *G*G*K*31*14*025*04*01

RRE*104*R*MEC *0000032071*A* *G*G*K*29*16*025*04*01

RRE*105*R*RBOX*0000036246*A* *G*G*K*32*14*025*04*01

RRE*106*R*ADMX*0000017757*A* *G*G*K*34*02*024*04*01

RRE*107*R*SHPX*0000201378*A* *G*G*K*30*16*024*04*01

RRE*108*R*UTLX*0000628032*B* *G*G*K*29*17*024*04*01

EOT*108*E*CSXE*0000028671*00*20*K

EOC*0000005867