Impulse PCW-5181 Serial Communication Connections, Making RS-232/RS-485 Connections, SS-RS232

Chapter 3 - Connecting and Installing Your Impulse

B. Serial Communication Connections

Making RS-232/RS-485 Connections

The standard Impulse drive uses a 3-wire implementation of RS-232C. The RX, TX, and COM lines are the serial signals supported. No hardware handshaking is required. Note that some RS-232C devices require handshaking, such as RTS and CTS. It is the responsibility of the user to disable this handshaking via software or hardware (see Troubleshooting RS-232C Communication Problems on page 3-6 for more information).

If you will be using RS-485 communication, the typical 5-wire interface connection to a “host” is shown below. See “Multi-Dropping Impulse Drives with RS-485” on the next page for information on using termination resistors. Note: the maximum cable length for RS-485 communication is 4,000 feet.

Make your RS-232C connection as shown below. The PC Cable (IDC P/N SS-RS232) shown below, is an ideal choice for making trouble-free RS-232C connections to the Impulse.

IDC P/N

SS-RS232

Comm Port Settings

RS-232C/RS-485

Baud Rate	19200 (fixed)
Stop Bits	1
Data Bits	8
Parity	None
XON/XOFF	Yes

9-Pin Connector

RS-485 Host

COM PORT

3	(TX)	RS-232C
2	(RX)
5	(COM)
		COM PORT
	TX-
	TX+
	RX-	RS-485
	RX+
COM

3-4