Black Box IC476A-F-R2, IC476A-M-R2, IC477A-F-R2, IC477A-M-R2, IC478A-F-R2, IC478A-M-R2 IMPORTANT!

ASYNC 232↔422/485 CONVERTER

10.

11.

4.1.3 2-W

IRE

ONNECTION

only the transmit (XMT) pair

Converter Signal RS-485 Signal

XMT+..................................+ (positive)

XMT-...................................- (negative)

IMPORTANT!

If you are not using two IC476A-X-R2s back to back and the procedure on

the previous page produces garbage data (or none at all), flip the “A” and

“B” leads at one end of the 485 connection.

Contents

Main FEBRUARY 1998 IC476A-F-R2 IC477A-M-R2 IC476A-M-R2 IC478A-F-R2 IC477A-F-R2 IC478A-M-R2 Async 232422/485 Converter Page Page Page Page CHAPTER 1: Specifications 1. Specifications Page Page Page Page Page CHAPTER 3: Configuration Switch S1 Summary Table Position Function Factory Default Page CHAPTER 3: Configuration Typical Switch Applications Switch Settings Point-to-Point Multipoint 4W 4W HDX 2W 4W 2W 4. Installation 4.1 Connection to the RS-485 Interface Converter RS-485 (530) Device Signal DB25 Pin DB25 Pin Signal NOTES CHAPTER 4: Installation Converter RS-485 Device IMPORTANT! Page Converter Signal RS-485 Signal IMPORTANT! Page Page APPENDIX A: RS-232C Pin Configurations STANDARD DTE SETTINGDIRECTION DIRECTION DIRECTION DIRECTIONSTANDARD DCE SETTING Appendix A. RS-232C Pin Configurations

Black Box IMPORTANT!

Models: IC476A-F-R2 IC476A-M-R2 IC477A-F-R2 IC477A-M-R2 IC478A-F-R2 IC478A-M-R2

Converter Signal RS-485 Signal