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Black Box Corporation

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FEBRUARY 1998

IC476A-F-R2

IC477A-M-R2

IC476A-M-R2

IC478A-F-R2

IC477A-F-R2

IC478A-M-R2

Async 232

↔

422/485 Converter

Code:

IC478A-M-R2

Item:

Async 232

↔

485

Converter

S/N:

Code:

IC477A-M-R2

Item:

Async 232

↔

485

Converter

S/N:

Code:

IC476A-M-R2

Item:

Async 232

↔

485

Converter

S/N:

Summary of Contents for IC476A-F-R2

Page 1: ...46 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com FEBRUARY 1998 IC476A F R2 IC477A M R2 IC476A M R2 IC478A F R2 IC477A F R2 IC478A M R2 Async 232 422 485 Converter Code IC478A M R2 Item Async 232 485 Converter S N Code IC477A M R2 Item Async 232 485 Converter S N Code IC476A M R2 Item Async 232 485 Converter S N ...

Page 2: ...quired to take whatever measures may be necessary to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio Interference Regulation of the Canadian Department...

Page 3: ...icamente con carritos o pedestales que sean recomendados por el fabricante 7 El parato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación Todo otro servicio deberá ser referido a personal de servicio calificado 9 El aparato eléct...

Page 4: ...ado únicamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deberá ser localizada lejos de las lineas de energia 16 El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación 18...

Page 5: ... re Finished Configuring 13 4 Installation 14 4 1 Connection to the RS 485 Interface 14 4 1 1 4 Wire Connection Using the DB25 IC477A or 78A X R2 14 4 1 2 4 Wire Connection Using Terminal Blocks IC476A X R2 15 4 1 3 2 Wire Connection 18 4 2 Connection to the RS 232 Interface 19 4 3 Wiring for Multipoint Applications 19 4 4 Operation 20 Appendix A RS 232C Pin Configurations 21 Appendix B 422 485 53...

Page 6: ...Mode 4 wire full or half duplex 2 wire half duplex Range Up to 9 miles 14 5 km depending on baud rate and type of cable Control Signals DSR turns ON immediately after the terminal raises DTR DCD turns ON after recognizing the receive signal input on the RS 422 interface CTS turns ON after the terminal raises RTS Carrier Strap selected either continuous or switched operation controlled by RTS Surge...

Page 7: ...idity 5 to 95 noncondensing Altitude Up to 10 000 feet 3048 m Power Draws operating power from RS 232 data and control signals no AC power or batteries required Size 2 7 H x 2 1 W x 0 7 D 6 9 x 5 3 x 1 8 cm Shipping Weight 1 lb 0 5 kg ...

Page 8: ...rops in a multipoint polling environment The Converter may be configured for high or low impedance operation carrier may be set to constantly on or controlled by RTS and the unit can operate with or without echo half duplex mode RTS CTS delay may be set for no delay or 8 milliseconds The Converters can be ordered with either male or female DB25 connectors for RS 232 For RS 485 530 connections you ...

Page 9: ... DTE DCE switch The figure below shows the DTE DCE switch location along with the location of the terminal block The illustration at the top of the next page shows the location of the eight position DIP switch on the underside of the Converter s PC board DCE DTE RCV G XMT 3 Configuration DTE DCE Switch Terminal Block ...

Page 10: ... the device connected to the Converter is a modem or multiplexor or is wired like one set the switch to DTE The setting causes the Converter to behave like Data Terminal Equipment and transmit data on pin 2 If the device connected to the Converter is a PC terminal or host computer or is wired like one set the switch to DCE This setting causes the Converter to behave like Data Communications Equipm...

Page 11: ...2 wire half duplex mode only echo mode used in 2 wire half duplex mode only method of carrier control transmit off impedance receive impedance and 2 wire 4 wire operation These switches are located internally on the underside of the Converter s PC board To access switch set S1 use a small flat blade screwdriver to pop open the Converter s case as shown below ON OFF ON 1 2 3 4 5 6 7 8 ...

Page 12: ...ched simultaneously Switches S1 7 and S1 8 should also be switched simultaneously S1 1 and S1 2 Transmit Off Impedance Switches S1 1 and S1 2 are set together to determine whether the receiving device sees the impedance of the Converter s transmitter as being high or intermediate when the transmitter is turned off The intermediate setting is useful in half duplex environments where the receiving d...

Page 13: ...On NOTE Carrier is ON when RTS is asserted positive and OFF only when RTS is driven to a negative voltage S1 6 Receive Impedance Termination The setting for switch S1 6 selects the impedance of the input receiver You may select either a low impedance of 120 ohms or a high impedance of 16K ohms By selecting the proper impedance for each drop there may be up to 31 receivers in one application S1 6 S...

Page 14: ... On On On Off On Echo S1 4 Off Off Off Off Off Carrier Control S1 5 Off On On Master Off On Slaves On Rcv Impedance S1 6 On On On Master On Slaves Off Last Slave On 2 wire 4 wire S1 7 Off Off On Off On 2 wire 4 wire S1 8 Off Off On Off On 3 2 3 WHEN YOU RE FINISHED CONFIGURING Once you ve finished setting the Converter s configuration switches don t snap the case halves back together yet If you ar...

Page 15: ...mewhat and unshielded produces better results than shielded The Converter is available with several different physical interfaces on the RS 485 side DB25 following the RS 530 standard and terminal blocks with strain relief 4 1 1 4 WIRE CONNECTION USING THE DB25 IC477A X R2 AND IC478A X R2 The DB25 connector on the Converter s RS 485 side conforms to the RS 530 interface standard When connecting to...

Page 16: ...connect two pairs of bare wires to the Converter you will need to open the case to access the terminal blocks The following instructions tell you how to connect the bare wires to the terminal blocks and fasten the strain relief collar in place so that the wires won t pull loose 1 You should already have the case open for the configuration procedure If not open the case as described in Section 3 2 ...

Page 17: ... below Converter RS 485 Device XMT RCVA XMT RCVB G To Shield Optional G RCV XMTB RCV XMTA 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 6 If there is a shield around the twisted pair cable it may be connected to G on the terminal block To avoid ground l...

Page 18: ...ightly Slide the assembly so that it is about two inches 5 1 cm from the terminal posts and press together firmly 9 Insert the strain relief assembly with the wire going through it into the slot in the bottom half of the modem case and set it into the recess in the case RCV G XMT RCV G XMT RCV G XMT CHAPTER 4 Installation ...

Page 19: ...e RS 485 devices employ a two wire half duplex configuration When using this configuration be sure to first set the Converter to two wire mode then use only the transmit XMT pair as shown below 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 a...

Page 20: ...1 8 m 4 3 Wiring for Multipoint Applications The Converter supports multipoint applications using daisychain topology Using a daisychain topology you may connect several Converters together in a master slave arrangement Maximum distance between the units will vary based upon the number of drops data rate wire gauge etc The illustration below shows how to wire the two pair 4 wire cables properly fo...

Page 21: ...he RS 232 and RS 485 interfaces are passed straight through Additionally in DCE mode a Transmitter ON signal received at the RS 422 485 RCV connection will cause DCD output at the RS 232 connector to assert HIGH In DTE mode a Transmitter ON signal at the RS 422 485 RCV connection causes RTS output at the RS 232 connector to go HIGH Therefore one hardware signal in either DTE or DCE mode is virtual...

Page 22: ... Data Carrier Detect From Converter To Converter From Converter To Converter To Converter To Converter DIRECTION DIRECTION STANDARD DCE SETTING To Converter FromConverter To Converter FromConverter FromConverter From Converter 1 FG Frame Ground 2 TD Transmit Data 3 RD Receive Data 4 RTS Request to Send 5 CTS Clear to Send 6 DSR Data Set Ready 7 SG Signal Ground 8 DCD Data Carrier Detect Data Term ...

Page 23: ...e 16 RXB negative 4 RTS A positive 5 CTS A positive 6 DCE Ready A positive 8 Rcv Line Signal Detect A positive 10 Rcv Line Signal Detect B negative 13 CTS B negative 19 RTS B negative 20 DTE Ready A positive 22 DCE Ready B negative 23 DTE Ready B negative Has internal function as well as being looped to the associated pin in the diagram Appendix B 422 485 530 Pin Configuration ...

Page 24: ... If you receive nothing back a there s not enough or any power to the Converter The Converter requires at least 6 VDC under load Or b one or both of the twisted pair cables is bad Or c the Converter s DTE DCE switch is in the wrong position Or d the Converter is defective 5 If you receive the data back but it is garbled flip the and connections on the RCV connection If that does not resolve the pr...

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