Applied Motion STM23C-3CE - Manual (Page 16)

Connecting the STM23 Communications
The STM23 is available with four types of communications: RS-232, RS-422/485, Ethernet and CANopen/RS-232. Each
type requires a different hardware connection for interface to a PC or other host system. The RS-232 version (STM23x-
xAx) comes with a cable that will provide the interface to an RS-232 port through a DB9 style connector. The RS-422/485
version (STM23x-xRx) requires the user to provide both the cabling and the RS-422/485 interface. The Ethernet versions
(STM23Q-xEx and STM23IP-xEx) require the user to provide a CAT5 or better Ethernet cable for interfacing to the drive.
This cable can be either a straight-thru or cross-over type. The CANopen/RS-232 version (STM23C-xCx) also includes an
RS-232 port for configuration. Below are descriptions of how to interface various STM23 Drive+Motors to a PC.
Connecting to a PC Using RS-232
• Locate your computer within 8 feet of the Drive+Motor.
• Your drive was shipped with a communication cable. Plug the large end into the serial port of your PC and
the small end into the RS-232 jack (RJ-11 connector) on your drive. Secure the cable to the PC with the screws
on the sides.
Never connect a drive to a telephone circuit. It uses the same connectors and cords as telephones and mo-
dems, but the voltages are not compatible.
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 STM23 Using USB.
Pin Assignments of the RS-232 Port (RJ11 connector)
The 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. This 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 controller.
It also allows the communication cable to be long (more than 300 meters or 1000 feet). We recommend using Category
5 cable in low electrical-noise environments. Category 5 cable is widely used for computer networks, inexpensive, easily
obtained and certified for quality and data integrity. For electrically noisy environments we recommend twisted pair
cable with an overall shield and drain wire. Connect the drain wire at one end of the cable to earth ground..
RS-422/485 versions of the STM23 can be used with either four-wire or two-wire configurations. Both types of con-
figurations 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).
ground (to PC ground)
TX (to PC RX) +5V Supply (for SiNet Hub)
RX (to PC TX)
16
STM23 Hardware Manual
920-0021F
2/14/2012