Technisches
Handbuch
SMCI33
Connections and circuits
3.5 RS485 network: connector X5
SMCI33 in a network
Up to 254 stepper motor controls can be controlled in a network from a PC or PLC.
These network connections are set up via the RS485 interface.
D-sub socket connector
A 9 pin D-Sub socket connector is located on the top of the SMCI33 (connector X5).
The connector X5 provides the optional connection to the RS485 network.
Pin assignment connector X5: RS485 interface
Pin no.
Name
Observations
1 NC
Not
assigned
2 Rx+
RS-485
Rx+
3
+5 V
5 V
4 Tx+
RS-485
Tx+
5 NC
6 NC
7 Rx–
RS-485
Rx–
8
GND
Output GND (0 V)
9 Tx–
RS-485
Tx–
Two-wire operation
To enable RS485 two-wire transmission capability, all bus stations must have a
direction control.
An intelligent converter, which automatically switches to transmission mode when a
start bit is received at the RS-232 interface and returns to reception mode at the end
of the stop bit, enables two-wire operation of the SMCI33. This solution does not
require software support.
We can recommend the ICP-7520 converter, for example, that is available from
Schuricht.
Talk to our Technical Hotline if you require support for this.
Issue: V 2.2
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