Delta DVP-ES2 - Manual (Page 660)

D V P - E S 2 / E X 2 / S S 2 / S A2 / S X 2 / S E O p e r a t i o n M a n u a l - P r o g r a m m i n g
7-4
7.2.2 The Profile
7.2.3 The CAN Interface and the Network Topology
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The pins of COM3 (CAN interface)
Pin Description
CAN+ CAN-H
CAN- CAN-L
SG
Signal
ground
Wh i te ( CA N_ H)
B l u e ( CA N_ L )
D+
D-
CA N+
S G
CA N-
B l a ck( S G )
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The CAN signal and the data frame format
The CAN signal is a differential signal. The voltage of the signal is the voltage difference between
CAN+ and CAN-. The voltage of CAN+ and that of CAN- take SG as a reference point. The CAN
network can be in two states. One is a dominant level, and is indicated by the logical “0”. The other
is a recessive level, and is indicated by the logical “1”. The CAN signal level is shown below.
The data frame format is shown below. The CAN nodes transmit the CAN messages to the network
from left to right, as the data frame format below shows.
Dominant Recessive
Tighten it with a slotted
screwdriver.