SmarTek Systems SAS-1 Detailed Communication Formats - Manual (Page 3)

SmarTek Systems (www.smarteksys.com) 3
Detailed SAS-1 Communication Message Formats
This document lists and describes in detail the entire set of SAS-1 messaging formats.
Every effort has been made to ensure the accuracy of the document relative to SAS-1 capability
and operation.
Command to SAS-1: Traffic Acoustic Image Reporting (SAS Monitor Mode=1)
{SASxxxx,BTR=Strt_LD,No_LDs,LD_Step}
All parameters are offset by +32 (20 Hex) and is ASCii character 27.
SASxxxx (ASCII) SAS-1 Identification (xxxx=0000 to 9999)
Strt_LD (Byte) Starting look direction
No_LDs (Byte) Number of look direction to send out
LD_Step (Byte) LD step size relative to 181
SAS-1 Response:
Chr(2)<5 bytes Avg Pk Val><5 bytes Veh Cnt>
<5 bytes Veh Spd><5 bytes Op Sens>Chr(3)
Each byte in packet is offset by +32 (20 Hex).
Command to SAS-1: Traffic Flow Measurement Reporting (SAS Monitor Mode=2, 4,6, 7)
{SASxxxx,FLOW=Comm_Mode,Mess_Format}
All parameters are offset by +32 (20 Hex) and is ASCii character 27.
Comm_Mode (Byte) =1 for Polled, =2 for Periodic
Mess_Format (Byte) =0 or 1 for Simple Flow, 2 for Flow with Truck Count
SAS-1 Response (Mess_Format=0,1):
Chr(2)SASxxxxPPPLLVVVOOOSSSS (Lane 1 data)
LLVVVOOOSSSS (Lane 2 data)
LLVVVOOOSSSS (Lane 3 data)
LLVVVOOOSSSS (Lane 4 data)
LLVVVOOOSSSSChr(3) (Lane 5 data)
or
SAS-1 Response (Mess_Format=2):