Siemens SG-6048-01 manual Connecting with Short-Haul Modems, Connecting With Short-Haul Modems

3 Installing the Converter

3.4Connecting with Short-Haul Modems

If the distance between your PC and Isolated Multi-Drop converter is greater than 50 feet but less than 3.5 miles, you can connect them using short-haul modems and regular telephone cable. To install the Isolated Multi-Drop converter using short-haul modems, you need these items:

•two short-haul modems

•telephone cable that does not exceed 3.5 miles in length

•one Isolated Multi-Drop converter mounting kit (if you want to mount the converter in a switchgear panel)

•one or two RS-232 serial cables

for either side of the modem connection

3.Insert the RS-485 connector(s) into the port(s) on the front of the converter. (Refer to section 3.1 for instructions on installing a connector on the RS-485 cable.)

4.Connect the supplied power cord to the 120 VAC connection on the converter, and plug the other end into any 120 VAC grounded power source.

5.Turn the converter’s power switch on, and verify that the PWR LED is lit. (Refer to Section 5 “Troubleshooting” if the PWR LED is not lit.)

6.Start your software.

For the RS-232 cables, use DCE-DTE cable with the pin assignments given in Table 3.1. For mounting to a switchgear panel, mount the converter before wiring. (Refer to Appendix B for mounting dimensions.) Then follow these steps, referring to Figure 3.3.

1.Connect short-haul modems to the RS-232 port on the converter and to the RS-232 port on the PC. Plug them directly into the ports or use the RS-232 serial cables. (If you need help in connecting the modems and setting their switches, refer to the modem’s manual.)

2.If you’re using application software that requires direct DCD/RTS control, set the DCD/RTS switch to DCD and the MAN/AUTO switch to MAN. If you are using application software that does not require direct DCD/ RTS control, set the MAN/AUTO switch to AUTO, and use the BAUD thumbwheel to set the data rate to match that of the application software and the ACCESS devices on the network. (In Automatic mode, the converter ignores the setting of the DCD/RTS switch.)

Two Twisted-Pair Cables

3.5 Miles Maximum

Port 4

Port 3

22 AWG Shielded Twisted-Pair Cable

4000 Ft. Maximum

+

SHLD

-

RS-485

+

SHLDBus

-

+

+Device

-#1

+Device

-#n

		RS-232 Cable
Short-	Short-	50 Ft. Maximum
Haul	Haul
Modem	Modem

Port 2

Port 1

SHLD	Up to 32 devices
-

+To Other

SHLD

- RS-485 Devices

RS-232 Cable

50 Ft. Maximum

PC

with

Supervisory

Software

Isolated Multi-Drop

Converter

Figure 3.3 Connecting With Short-Haul Modems

6 Siemens Energy & Automation, Inc.