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© Systems, Inc.  2202 Manual   |  SL9097  6/ Sealevel 2021 

 

 

 

 

                   

  

 

Switch Examples  

 

Figure 2: RS422/485 Interface Configuration 

485 

Mode Selection 

    

OFF  :   422 Mode  

The transmitter lines TX+ and TX- are always driven  

ON : 

485 Mode   
The transmitter lines TX+ and TX- are switched to high   impedance when the device is 
not actively transmitting data   

 

NE 

485 option, OFF for 422 
OFF :  The receiver is always enabled.  In a two-wire setup the receiver will echo back all 

transmitted data. 

ON : 

The receiver is disabled when the transmitter is enabled.  In a two-wire setup the receiver 
will not echo back transmitted data. 

 

 

Switch positions 1 and 2 are for port 1 and switch positions 3 and 4 for port 2. 

 

 

 

 

 

 

 

 

ON

1
2
3
4

O

F

F

485 1
NE 1
485 2
NE 2

SW3

Summary of Contents for SeaPORT+2/485

Page 1: ...Systems Inc 2202 Manual SL9097 6 Sealevel 2021 SeaPORT 2 485 User Manual 2202...

Page 2: ...TARTED 4 INSTALLATION INSTRUCTIONS 5 CONFIGURATION 7 TECHNICAL DESCRIPTION 10 SPECIFICATIONS 11 APPENDIX A TROUBLESHOOTING 12 APPENDIX B HOW TO GET ASSISTANCE 13 APPENDIX C ELECTRICAL INTERFACE 14 APP...

Page 3: ...serial ports providing a versatile interface for common serial needs The advantage of this product over more traditional approaches is that it does not require opening the computer case nor does it r...

Page 4: ...Upstream Host Hub Advisory Conventions Warning The highest level of importance used to stress a condition where damage could result to the product or the user could suffer serious injury Important Th...

Page 5: ...declaration The publisher cannot be determined due to the problems below Authenticode signature not found Please select the Yes button and proceed with the installation This declaration simply means t...

Page 6: ...ORT 2 485 to an upstream host or hub The New Hardware Found wizard will now proceed to locate the appropriate drivers These drivers were installed during the SeaCOM software setup procedure Once the d...

Page 7: ...this configuration the box must be opened Do this by removing the four screws located on the bottom When reassembling please note that the top and bottom are keyed to fit in only one direction Electri...

Page 8: ...or 422 OFF No effect ON Connects TX to RX for two wire operation PU 485 option OFF for 422 OFF No effect ON Adds a 1 K ohm pull up resistor to RX PD 485 option OFF for 422 OFF No effect ON Adds a 1 K...

Page 9: ...o high impedance when the device is not actively transmitting data NE 485 option OFF for 422 OFF The receiver is always enabled In a two wire setup the receiver will echo back all transmitted data ON...

Page 10: ...vice that does not require opening the case No system resources are required i e I O ports or IRQ s LED status indicators for USB Enabled and port activity Connector Pin Assignments RS 422 485 DB 9 Ma...

Page 11: ...cm Package Width 5 32 inches 13 51 cm Package Height 1 50 inches 3 81 cm Mean Time Between Failures MTBF Greater than 150 000 hours Calculated Manufacturing All Sealevel Systems Printed Circuit boards...

Page 12: ...unications The supplied loopback plug connects TD to RD If you decide to test the Modem Control Signals a full pin loopback plug will be required Details on loopback plugs are included on WinSSD Conta...

Page 13: ...eady to run diagnostics 3 Sealevel Systems maintains a home page on the Internet Our home page address is www sealevel com The latest software updates and newest manuals are available via our FTP site...

Page 14: ...r RS 485 RS 485 is backwardly compatible with RS 422 however it is optimized for party line or multi drop applications The output of the RS 422 485 driver is capable of being Active enabled or Tri Sta...

Page 15: ...e end of the character is defined by the transmission of a pre defined number of stop bits usually 1 1 5 or 2 An extra bit used for error detection is often appended before the stop bits Figure 3 Asyn...

Page 16: ...is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect...

Page 17: ...the equipment The correction of interference caused by such unauthorized modifications substitutions or attachments will be the responsibility of the user Always use cabling provided with this product...

Page 18: ...y Warranty service may be obtained by delivering the Product to Sealevel and providing proof of purchase Customer agrees to ensure the Product or assume the risk of loss or damage in transit to prepay...

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