Table of Contents
Contents
1. Simplex uses reverse two wire cabling to link all the connected 4855 units as shown in the figure below PLI COME gt COM C CRE C CHI COM For all IC 485SN units set SW1 to DCE or DTE depending on what type of device the 4855 will plug into if it will plug into a DCE device configure it for DTE and vice versa For all 4855 units set SW2 to TXON RxON Installation Set the configuration switches SW1 and SW2 according to the information provided in the Switch Configuration and Operation sections Plug the IC 485SN s DB 25 female connector into the PC s RS 232C port Use telephone cable to connect 1 4855 unit to the other a Use four wire or two wire cable according to the information given in the Operation section b Use reverse or straight through wiring according to the information given in the Operation section C You use the RJ 11 telephone jack or wire directly to the Terminal Block see the Appendix for the Terminal Block pin assignments If you are daisy chaining units you will need to use either a two to one RJ 11 adapter or a combination of the terminal block and the RJ 11 jack Power On the PC The unit is now ready for operation I N gt Appendix Terminal Block Pin Assignments DCE DTE Connection Description Fin Cable2. and Simplex Point to Point and Multidrop can be configured for Full Duplex or Half Duplex operation Each of the operating modes is explained below Point to Point A Point to Point configuration is one in which two devices located at two different places are linked for communication by a pair of 1 4855 units There are two configurations Point to Point Full Duplex and Point to Point Half Duplex 1 Point to Point 4 Wire Full Duplex Point to Point Full Duplex uses reverse four wire cabling as shown in the figure below 41 25 00 25 Connect ee E ym mah pes For both 1 4855 units set SW1 to DCE DTE depending on what type of device the 4855 will plug into ifit will plug into a DCE device configure it for DTE and vice versa For both IC 485SN units set SW2 to 2 Point to Point 4 Wire Half Duplex Point to Point Half Duplex uses straight through four wire cabling as shown in the figure below ER F 9 39 Cening D ening te PON m he pw COM For both 4855 units set SW1 to DCE or DTE depending on what type of device the IC 485SN will plug into ifit will plug into a DCE device configure it for DTE and v
3. Table of Contents I tea 1 Fe c 2 Switch Configuration 3 Operating 5 Pella 5 MUOTO e 7 sz C 10 0 12 TANG 13 Terminal Block Pin 13 DCE DTE Connection 13 SW2 Pin Assignment Schematics nn 14 SIO O CNG s tete ouod Iota 17 18 Radio amp TV 19 The 4855 package contains One IC 485SN Converter One User Manual Check to see if the product has been damaged in shipping If you encounter a problem contact your dealer right away Copyright 1998 ATEN Intemational Co Ltd Manual Part No PAPE 0149 100 Printed in 11 1998 All brand names and trademark are the registered property of their respective owners 1 4855 is a bidirectional converter for RS 232 and RS 485 RS 422 interfaces that provides Point to Point Multidrop and Simplex operations A figure showing the names and locations of its features is given below HE E DE 5 C omre The
4. 12 4895 SW2 Pin Assignment Schematics TxON RxON 1 KL 2 w B es TxRTS RxON Tx 2 DTR CSR RTS CTS TxDTR RTS RxDSR ON Troubleshooting propery up ond p mesari both deim If the above solutions fail to alleviate the problem contact your dealer for help Specifications a 4 zr 1 2 pe hen n s bi Rz DE Dirrangigenz Lx Ws Radio amp Interference Warning This equipment generates uses and radiates radio frequency energy and if not installed and used in accordance with the instruction manual may cause interference to radio and television reception It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart of Part 15 of the FCC Rules which are designed to provide reasonable protection against such interference when operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be required to correct the interference If this equipment does cause interference to radio or television reception which can be dete
5. all Slave IC 485SN units set SW2 to TxRTS RXON 2 Multidrop Half Duplex Multidrop Half Duplex uses straight through four wire cabling to link all the connected IC 485SN units as shown in the figure below 5 m C enn te PCR s m AEN Er ta i I BUN aiia zi peg COM pai Cann act C ia m to COM pes Dn zs pps For all IC 485SN units set SW1 or DTE depending on what type of device the 4855 will plug into ifit will plug into a DCE device configure it for DTE and vice versa For all C 485SN units set SW2 to TXDTR RTS RXDSR ON Note Only one device at a time can talk on the bus RTS On during that time the other devices must remain silent RTS Off See the explanation regarding TxDTR RTS RXDSR ON in table on p 4 TxDTR RTS RXDSR ON transmitting receiving mode involves a straight through Data Data Busy Busy wiring scheme See the pin assignment schematic in the Appendix for more details Simplex A Simplex configuration is one in which more than two devices are linked for communication using several 4855 units in a manner similar to Multidrop configuration The difference is that in a Simplex configuration the master device can only talk and the slave devices can only listen
6. ice versa For both IC 485SN units set SW2 to TxDTR RTS RXDSR ON Note TxDTR RTS RXDSR ON transmitting receiving mode involves a straight through Data Data Busy Busy wiring scheme See the pin assignment schematic in the Appendix for more details Multidrop A Multidrop configuration is one in which more than two devices are linked for communication using several 4855 units Either a two to one 11 adapter or a combination of the terminal block and the RJ 11 jack can be used to connect the IC 485SN units to each other One of the devices that one of the IC 485SN units connects to is assigned to be the master device The remaining devices that the other 4855 units connect to are slave devices There two configurations M ultidrop Full Duplex and M ultidrop Half Duplex 1 Multidrop 4 Wire Full Duplex e Multidrop Full Duplex uses reverse four wire cabling to link all the connected 4855 units as shown in the figure below PCI Pc CoM COME OMe Pc For all 4855 units set SW1 to DCE or depending on what type of device the 4855 will plug into if it will plug into a DCE device configure it for DTE and vice versa For the Master 4855 unit set SW2 to TXON For
7. operating mode contention control and RS 232C assignments are all configured with two slide switches SW1 and SW2 details are given in the Switch Configuration section below Data Transmission Controlled by the RTS Signal DCE DTE Selectable Point to Point M ultidrop and Simplex Duplex Operating M odes External Power Not Required Power Supplied by the RS 232 Interface Compact Size Switch Configuration The 4855 is configured by setting two slide switches SW1 is used to select the C 485SN s Device M SW2 is used to select the IC 485SN s Transmitting and Receiving Mode as shown in the table below jhe be plugged 4855 ba iz ni the 48355 ie going the IC 485 5 mus be ant be EHNE m E PMNISE hamari This ix ued in Muhdrep cperchons in wh N DIIS tng TE When the ETS high Goch mede chama mede bna ie bump bum RTS sign of fede Baer bo broneragien ugnal ie gent ho kaap the cther devices Som honing Echerohcs Operating Modes 4855 supports three operating modes Point to Point
8. rmined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures 1 Reorient the receiving antenna 2 Relocate the computer with respect to the receiver 3 Move the computer away from the receiver 4 Plug the computer into a different outlet so that the computer and receiver are on different branch circuits 5 Ensure that the mounting screws attachment connector screws and ground wires tightly secured 6 Ensure that good quality shielded and grounded cables are used for data communications If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions
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