Connect Tech DFlex-4/104 - page 68

4-18 Chapter 4: Appendix F - RS-485/422 Option

DFlex-4/104 User’s Manual, ver. 0.04

RS-485/422 SLIM

You can use the RS-485/422 SLIM in 2 wire and 4 wire multi-

drop configurations where the RS-485 line drivers are disabled to

allow other devices access to the line.

Your DFlex-4/104 adapter does not provide DIP switches to

control the driver enables for the RS-485 SLIM. Instead, the DTR

signal is used to gate the control. If DTR is asserted, the drivers

are always enabled. If DTR is not asserted, then the driver will be

enabled only when RTS is asserted. To disable the RS-485 line

driver you must not assert DTR and RTS.

Also, the receivers on the RS-485 SLIM are biased high through

fixed resistors. Please refer to Figure 14 for a partial schematic

of the RS-485/422 SLIM circuit, while Table 9 shows the pinouts

for the SLIM sockets found on the DFlex-4/104 adapter.

Your DFlex-4/104 adapter is very sensitive to static electricity.

Make sure that before you remove the card from the anti-static

shipping bag, you wear an anti-static wristband. When you

remove the board from the anti-static bag, handle it only by the

edges and place it on the anti-static bag or an anti-static mat.

Contents

Main Connect Tech Inc. DFlex-4/104 Page LIMITED WARRANTY Copyright Notice Trademark Acknowledgment Page Page Table of Contents Page List of Tables List of Figures Page Chapter 1: Introduction Page Page Page Page Page Chapter 1: Introduction 1-5 DFlex-4/104 User's Manual, ver. 0.04 Figure 2: DFlex-4/104 - 16 port configuration Page Page Page Page Page Chapter 2: Hardware Installation Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Chapter 3: Software Installation Page Page Page Page Utilities Chapter 4: Appendices Page Appendix A: Specifications Page Appendix B: Connectors/Pinouts Page Page Page Appendix C: Factory Settings Page Page Page Appendix D: SLIM Insertion/Removal Page Appendix E: RS-232 SLIM Option Page Page 4-16 Chapter 4: Appendix E - RS-232 Option Table 8: SLIM pinouts Note: earlier versions of the current loop SLIM have pins 22, 23, 32, and 33 tied low. Appendix F: RS-485/422 Options Page Chapter 4: Appendix F - RS-485/422 Options 4-19 DFlex-4/104 User's Manual, ver. 0.04 Figure 14: RS-485/422 SLIM partial schematic 4-20 Chapter 4: Appendix F - RS-485/422 Option Table 9: SLIM pinouts Note: earlier versions of the current loop SLIM have pins 22, 23, 32, and 33 tied low. Page Page Appendix G: RS-423 Options Page Chapter 4: Appendix G - RS-423 Options 4-25 Table 10: SLIM pinouts Note: earlier versions of the current loop SLIM have pins 22, 23, 32, and 33 tied low. Page Appendix H: 20mA Current Loop Option Page Page 4-30 Chapter 4: Appendix H - 20mA Current Loop Table 11: SLIM pinouts Note: earlier versions of the current loop SLIM have pins 22, 23, 32, and 33 tied low.