Moons' Applied Motion Products StepSERVO SSDC Series, Руководство по оборудованию

Страница: 10 / 52

10
Rev. 1.0
7/31/2019
SSDC-R/C/IP Hardware Manual
RS-485 network connection
Multiple –R model drive network can be built via dual RS-485 communication port by daisy chain cable or network cable
provided.
RS-485 Four-wire Configuration
RS-485 four-wire system utilize separate transmit and receive wires. One pair of wires connect the host’s transmit
signals(TX+/TX-) to each drive’s RX+/RX- receive terminals. The other pair connects the drive’s TX+/TX- terminals to the
host’s receive signals. A logical ground terminal is provided on each drive and can be used to keep all the drives at the same
ground potential. The first drive’s logical GND of the RS-485 bus must connect to host’s ground.
Four-wire Connection
Connect the drive’s RX+ to the TX+ terminal of the host controller, and connect the drive’s RX- to the TX- terminal of the host
controller. Connect the drive’s TX+ to the RX+ terminal of the host controller, and connect the drive’s TX- to the RX- terminal
of the host controller.
Connect the drive’s GND and the host’s GND to a same ground.
RS-485 Tow-wire Configuration
In a two-wire system, the data transmitting and receiving use a same cable. The host must stop its transmitting before
receiving data. That means the host must stop transmit data before drive begins to answer a query which just come from
the host, otherwise the host cannot receive any data witch sent from a drive. There is a transmit delay parameter that can be
adjusted to compensate for a host that is slow to disable its transmitter. This adjustment can be set over the network using
the TD command, it also can be set by using the StepSERVO Quick Tuner software. Users can set a shorter transmit delay in a
four-wire system.
Two-wire connection
The RX+ and TX+ of the drive connect to the host’s + in parallel. The RX- and TX- of the drive connect to the host’s - in
parallel. Connect the drive’s GND and the host’s GND to a same ground.