Parker PVSG - Sae J1708; Local Interconnect Network; Ethernet

PVSG User Guide
15
e USB is intended for PVSG conguration and programming. It may also be used to access logs
(depending on version) and as a Data Link Adapter to connected modules.
e following table provides specications for the USB port:
Item Min Nom Max Unit
Communication speed
Full speed
High speed
12
480
Mbps
Mbps
Capacitance of I/O to ground
Host
Device
134
2
µF
µF
VBUS output current limit 254 292 336 mA
VBUS output current rating 200 mA
ESD suppression, data pins 0.25 pF
ESD suppression, ID pin 68 nF
Reverse standoff voltage (see
note 1)
5 V
Note 1: USB connectors are not rated to survive a short to vehicle battery.
Note: If the USB from the PVSG is plugged into the PC and doesn’t work. Try unplugging the
USB cable, power cycle the PVSG, then plug the USB cable back in. Repeat until the USB is
successfully connected.
6.4. SAE J1708
SAE J1708 is a legacy standard used for serial communications between ECUs on a heavy duty vehicle
and also between a computer and the vehicle. e PVSG can has 1 of this type communication port.
e J1708 port is provided to connect J1939 networks to legacy J1708 protocol devices.
Note: On power up the PVSG J1708 communication port is briey held dominant. e PVSG
J1708 communication port is also briey held dominant while PVSG prepares to go to sleep,
and while it is being reprogrammed. While the PVSG J1708 communication port is dominant,
message transmission is not possible on the J1708 communication bus connected to the
PVSG.
6.5. Local Interconnect Network
e LIN (Local Interconnect Network) protocol is a compliment to the CAN protocol and may be used for
applications that are not time critical or do not need extreme fault tolerance.
e PVSG may have up to 4 LIN ports depending on conguration.
As a cost-eective network solution, LIN is mainly used for less critical functions, and implementing low
cost automotive sensors. LIN is not quite as robust as the CAN protocol.
6.6. Ethernet
e PVSG has up to 1 Ethernet port depending on version. e port meets standard IEEE 802.3,
10/100BaseTx and has a transmission rate of 10/100 Mbits per second.