Inovance AM600 Series - Serial Communication Connection through RS485

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Introduction
5) Wiring
CANopen uses a DB9 connector for data transmission. The following table de󶍾nes the DB9 pins:
Pin Diagram Pin Signal De󶍾nition
5
9
4
1
2
3
8
7
6
PIN2 CANL
PIN7 CANH
PIN3 CGND
You are advised to use a shielded twisted pair for CAN bus connection and connect two 120 Ω termina-
tion resistors at both ends of the bus to avoid signal re󶍿ection. The shield layer uses single point ground-
ing. Do not bind the cable together with the AC power cable and high-voltage cable to prevent communi-
cation signals from being interfered.
The following table lists the relationship between the DIP switch value of the CANopen module and the
communication baud rate:
DIP switch value
(BR2/BR1/BR0)
0 1 2 3 4 5 6 7
Baud rate
(bit/s)
1 M 800 K 500 K 250K 125K 50 K 20 K 10 K
The following table lists the relationship between the CANopen transmission rate and the transmission
distance:
Baud Rate (bit/s) Max. Bus Length (m)
1 M 30
500 K 80
250 K 150
125 K 300
50 K 1000
The following table lists the relationship between the number of CANopen nodes
,
cable impedance
,
and
transmission distance:
Max. node count
Communication
cable resistance
16 32 64
33 Ω/km 575 m 530 m 460 m
70 Ω/km 270 m 250 m 215 m
88 Ω/km 215 m 200 m 170 m
93 Ω/km 205 m 185 m 160 m
157 Ω/km 120 m 110 m 95 m
5.5.5 Serial Communication Connection Through RS485
1) RS485 bus connection topology
The following 󶍾gure shows the topological structure of the RS485 bus connection. You are advised to use
a shielded twisted pair for RS485 bus connection and use twisted pairs to connect the 485+ and 485- ter-
minals. Connect a 120 Ω termination resistor at both ends of the bus to avoid signal re󶍿ection. Connect
the reference ground of RS485 signals of all nodes. A maximum of 128 nodes can be connected
,
and the
distance of each branch cable must be less than 3 m.