StarTech.com RS-232 to RS485/422 Serial Converter
Contents
1. through a couple of IC485S GB EU devices Point to Point 4 Wire A B Full Duplex T R T R PC1 gt gt PC2 R T COMI COMI R T COM2 COM2 IC485S IC485S Configuration SW IL DCE DTE DCE DTE If the PC1 is a DTE device then the Device A SW1 should be set to DCE If the PC1 is a DCE device the the Device A SW1 should be set to DTE The switch setting method for the Device be is identical to Device A s Point to Point 2 Wire Half Duplex PC1 gt gt PC2 COMI COMI COM2 COM2 IC485S IC485S Configuration SW2 SW1 DCE DTE TxRTS RXRTJ o DCE DTE TXRTS RxRT ee Others Terminal Block Definition The four screw terminal block has different definitions in different operation modes In the DCE DTE mode the terminal 1 V and 2 V are configured to transmit data the transmitter the terminal 3 V and 4 V are configured to receive data the receiver In the monitor mode the terminals 1 and 2 are respectively the positive and negative of receiver 1 the terminal 3 and 4 are the positive and negative of receiver 2 DCE DTE Receiver 1 V Receiver 1 V tV Receiver V Self Test To test the internal circuit of the interface converter connect a loop back terminal to the unit and process as follows 1 Set SW1 to DCE if the loop back terminal is a DTE configuration 2 Set SW2 to TXON RxON 3 Connect one wire from Tx 1 to Rx 4 and2. Interface Converter RS 232 to RS 485 422 Serial Interface Converter Installation Manual IC485S IC485SGB IC485SEU StarTech com P 4 7 ii HH HH llbbiNO_ EH lil Overview Changing line signals is no longer a problem StarTech com s IC485S GB EU converts RS 232 serial interfaces to RS 485 422 serial interfaces This 2 in 1 converter converts RS232C to either the RS 485 or RS 422 interface Other features include DCE DTE selectable modes point to point multidrop configuration and the ability to monitor RS 485 422 signals The IC485S GB EU can be powered from the following two ways 1 DC 9V 200MA power adapter 2 The pin 9 of the RS 232 connector The following is a figure of the IC485S GB EU ia Connector Power Jack RJ11 Connector Terminal Block Features e Two in one converter Converts RS232C to either RS 485 or RS 422 e DCE DTE mode selectable e Supports point to point multidrop configuration e Can be used to monitor RS 485 422 signals e Full or half duplex operation Specifications Data rate Cable length RS 232 connector RS 485 connector RJ11 Female or 4 terminal block 54 x 74 x 19 Self powered or DC 9V 200mA Dimensions mm ee 0 o Radio and TV Interference Warning This equipment generates uses and radiates radio frequency energy and if not installed and used in accordance with the instruction manual may case interference to radio and television rec
3. connect another wire from Tx 2 to Rx 3 4 Set the terminal to full duplex and enter data then the data should be displayed on the screen 5 If this occurs the internal circuit is operational 41 15 M4 MAH Hz bb Ol Monitor Mode Monitor configuration means an IC485S GB EU device can be wired to the lines of RS 232 or RS 422 devices to monitor the line signals In this configuration the IC485S GB EU will change the function of the T and T to R and R respectively Before operating the user must complete the installation according to the procedure mentioned Once the installation has been done the device should operate as the setting function Monitoring Device 1 Device 2 IC485S Configuration Device SW1 SW2 MONI TXRTS RxON Note R and R signals are converted and linked to the RS 232 port and DB25 pin 3 R and R T and T signals are converted and linked to the RS 232 port DB25 pin 2 Note The RTS must be at the low level in monitoring mode a y a Multidrop Multidrop configuration means that more than two devices can be linked all together to communicate to one another through many IC485S GB EU devices In this configuration one of the IC485S GB EU devices will be connected to a master device and the rest of the IC485S GB EU devices will be connected to many other slave devices Multidrop 4 Wire Full Duplex BI R R PC1 gt i gt
4. eption It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of 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 determined 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 are 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 AO EAEAlEl i p5 gt il II II Ebk lege liiiiiiiii i i m Appendix Troubleshooting If failure of printing still exists upon the above
5. erter 4 Plug the power adapter into an AC outlet The unit is not ready for operation Switch Function Description Device Mode Selection Position 1 DCE means that the 1IC485S GB EU is set to the DCE mode and must be connected to a DTE device Position 2 DTE means that the IC485S GB EU is set to the DTE mode and it must be connected to a DCE device Position 3 Monitor means that the IC485S GB EU is set to the monitor mode and it is used to monitor the RS 485 line signals Transmitting and Receiving Mode Selection Position 1 TxON RxON means the IC485S GB EU is always in transmitting mode and in receiving mode using in Point to Point mode Position 2 TXRTS RxRTS means the IC485S GB EU is in transmitting mode while the RTS is at a high level and it is on receiving mode while the RTS signal is at a low level using in Multidrop mode Position 3 TxRTS RXON means the IC485 GB EU is always in receiving mode and it is in transmitting mode only while the RTS signal is at a high level using in Multidrop mode to monitor the RS 485 line signal Note DTE means Data Terminal Equipment DCE means Data Communication Equipment For more detailed information refer to the Appendix A Operation The IC485S GB EU supports 4 kinds of functions in 6 types of configurations Point to Point Point to Point configuration means two devices that locate different places can be linked together to communicate
6. pc2 COMI COMI T COM2 COM2 IC485S IC485S B2 R R T gt PC3 T COMI IC485S COM2 B3 R R T gt PC4 T COM1 IC485S COM2 Configuration SW ag DCE DTE TXON RxON Ea DCE DTE TXRTS RxON Note Bn means any one of the B1 B2 B3 and so on 5 Multidrop 2 Wire Half Duplex PCL gt COMI COM2 Configuration gt BCD COMI COM2 gt PC3 COMI COM2 gt PC4 COMI IC485S COM2 SW 1 DCE DTE TXRTS RxRTS DCE DTE TXRTS RxRTS Simplex Transmit Receive Only Simplex configuration means that more than two devices can be linked all together to communicate through many IC485S GB EU devices Its configuration is like the Multidrop s but the master device can talk only and the slave devices can listen only Simplex Transmit B1 Receive Only R R PC1 gt i gt PC2 COMI COMI T COM2 COM2 IC485S IC485S B2 R R T gt PC3 T COMI IC485S COM2 B3 R R T gt PC4 T COM1 IC485S COM2 Configuration DCE DTE TXON RxON fs DCE DTE TXON RxON Note Bn means any one of the B1 B2 B3 and so on 6 Em
7. solutions please contact your dealer for help 1 Check that the DC9V power adapter is available Check that the IC485SEU is plugged securely to the PC Failure of Data Transmission Check that the 4 wire cable is connected properly at both ends Check that the SW1 and SW2 are properly set RS 232 DCE DTE Description Device s Connector Pin 1C485S GB EU DCE DTE DCE DTE 25 25 or DCE DTE DB9 DB9 DB25 DB25 9 25 Pin DB25 DB25 lil ee Note The DTE mode devices must be connected ti a DCE mode device because the polarity of the communication signals are different The shadow area is a connection example for a DTE device to a DCE device ee Getting Started This section is designed to help you prepare the IC485S GB EU for installation Please read through this section carefully before attempting to install the converter Unpacking the IC485S GB EU This package should contain e 1 x interface converter e 1x power adapter Installation Before installing the IC485S GB EU you will need a 4 wire cable This cable must go from your location to the place you want to connect to 1 Decide on one of the 6 possible configurations suitable for your application Check the Operation for the correct slide switch settings and phone wires connection then connect the IC485S GB EU to the PC 2 Turn on the PCs 3 Insert the adapter s plug into the power jack on the right side of the conv
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