Connecting the STM17 Communications
e STM17 is available with two types of serial communications, RS-232 (STM17x-xAx) or RS-422/485 (STM17x-xRx).
Each type requires a dierent hardware connection for interface to a PC or other host system. e RS-232 version comes
with a cable that will provide the interface to an RS-232 port through a DB9 style connector. e RS-422/485 version
requires the user to provide both the cabling and the RS-422/485 interface. Below are descriptions of how to interface
both of these serial communication types to a PC.
Connecting to a PC using RS-232
Locate the STM17 within 8 feet (2.5 meters) of the PC. Plug the large end (DB9 connector) of the communication cable
that came with the drive into the serial port of the PC. e small end will have a 5-pin spring clamp connector. Plug this
end into the appropriate connector on the STM17. Secure the cable to the PC with the screws on the DB9 connector.
NOTE: If the PC does not have an RS-232 serial port, a USB Serial Converter will be needed. For more information,
please read
Connecting to an STM17 Using USB.
RS-232 Connector diagram
e RS-232 circuitry does not have any extra electrical “hardening” and care should be taken when connecting to the RS-
232 port as hot plugging could result in circuit failure. If this is a concern the RS-422/485 version should be used.
Do not plug or unplug the RS-232 connection while power is applied to the drive. is is known as “hot
plugging” and should be avoided.
Connecting to a host using RS-422/485
RS-422/485 communication allows connection of more than one drive to a single host PC, PLC, HMI or other computer.
It also allows the communication cable to be long (more than 300 meters or 1000 feet). e use of Category 5 cable is
recommended as it is widely used for computer networks, inexpensive, easily obtained and certied for quality and data
integrity.
RS-422/485 versions of the STM17 can be used with either four-wire or two-wire congurations. Both types of con-
gurations can be used for point-to-point (i.e. one drive and one host) or multi-drop networks (one host and up to 32
drives).
NOTE: To use the STM17 RS-422/485 version with the ST Congurator soware, the STM17 must be con-
nected to the PC in the four-wire “point to point” conguration (see below) and congured one axis at a
time.
Ground (circuit ground)
Ground (circuit ground)
TX (Transmit)
+5V (Internal Jumper Select)
RX (Receive)
13
STM17 Hardware Manual
920-0034 rev A
9/30/2010
(320 páginas)
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