User's Manual

9
10. SAE J2497 (PLC) DIAGNOSTIC LINK
All newer towed vehicles transmit a signal over the power
linetothetowingvehicleABSECU.Thesignal,usinga
heavy vehicle industry standard known as Power Line
Carrier(PLC\J2497),isbroadcastbythetrailerABSECU
overthebluewire(ignitionpowerline)oftheSAEJ560
connector and controls an in‑cab trailer ABS indicator lamp.
See Figures 7 and 8.
FIGURE 7 - POWER LINE WITHOUT PLC SIGNAL
FIGURE 8 - POWER LINE WITH PLC SIGNAL
The Bendix
®
TABS‑6
™
Adv module provides a data link for
PLCcommunicationfollowingtheSAEJ2497standard.
Bendix
®
ACom
®
diagnostics software (version 6.1 and
higher) and the Bendix
®
TrailerRemote Diagnostic Unit
(TRDU
™
) both support PLC communication with the
TABS‑6 Adv module.
PLC communication is applicable for 12-volt vehicle
applicationsonly.ThePLCcommunicationisdisabledfor
voltagesgreaterthan18volts.
Identifying and Measuring the PLC Signal
A TABS-6Adv module will continuously broadcast PLC
messages that indicate trailer ABS status. At power‑up,
or during a trailerABS diagnostic Trouble Code (DTC)
condition, the TABS‑6 Adv module will signal the tractor
ABS unit to illuminate the dash‑mounted trailer ABS
indicator lamp.
Diagnostic tools are available that detect the presence
ofa PLCsignaland performfurthersystem diagnostics
directly, using the power line. For more information on
these diagnostic tools, contact Bendix or refer to your local
authorized Bendix dealer or distributor.
An oscilloscope can also be used to verify the presence
andstrengthofaPLCsignalonthepowerline.ThePLC
signal isan amplitude andfrequency modulatedsignal.
Dependingontheloadonthepowerline,theamplitude
ofthePLCsignalcanrangefrom2.5mVp-pto7.0Vp-p.
Suggestedoscilloscopesettingsare(ACcoupling,1volt/
div,100µsec/div).Thesignalshouldbemeasuredonpin7
oftheJ560connectoratthenoseofthetrailer.
11. SAE J1939 (CAN) DIAGNOSTIC LINK
The TABS‑6 Adv module provides a data link for transmitting
CANinformationfollowingtheSAEJ1939standard.
Bendix
®
ACom
®
diagnostics software (version 6.1 and
higher) and the Bendix
®
Trailer Information Module both
supportCANcommunicationwiththeTABS-6Advmodule.
Ignition power must be provided to the TABS‑6 Adv module
for the diagnostic link to be active.
12. AUXILIARY I/O
The TABS‑6 Adv module provides for up to six auxiliary
input/output(I/O)functions.See Chart 3.
Name
ECU
Pin
Auxiliary Functions Auxiliary Type
AUX1 14
High-SideDriver Output
DigitalInput Input
AUX2 8
High-SideDriver Output
DigitalInput Input
AUX4 3
High-SideDriver Output
DigitalInput Input
AUX6 2
High-SideDriver Output
DigitalInput Input
GND12 15 Low-SideDriver Output
GND6 13 Low-SideDriver Output
SEN1
4 +5V Sensor Supply Output
9 Analog Input Input
10 Ground Input
SEN2
11 +5V Sensor Supply Output
17 Analog Input Input
16 Ground Input
CHART 3 – AUXILIARY I/OS
Bendix
®
ACom
®
diagnostic software (version 6.1 and
higher) supports the conguration of the TABS-6Adv
moduleauxiliaryI/Os.