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Installing the Hardware

13

RS-422/485 Operation

Unlike RS-232, the RS-485 and RS-422 specifications do not have a standard set of pinouts.
In general, whenever you use RS-422/485 devices you will need to make custom cables.  The
iNS pinouts for RS-422 /RS-485 mode are shown in Table 2-6.

Pin
#

Name

Direction

1

Not  used

2

RXB/RX+

Input

3

TXB/TX+

Output

4

Not  used

5

GND

6

Not  used

7

TXA/TX-

Output

8

RXA/RX-

Input

9

Not  used

Table 2-6: DB-9 Pinouts for RS-422 and RS-485

RS-485 2-wire mode uses the same pinouts, but the receive and transmit pairs should be
externally shorted together in the connector (TXA shorted to RXA and TXB shorted to RXB).
Note that some RS-422 and RS-485 devices refer to the differential pair of signals that make
up the transmit and receive lines as “-” and “+“ instead of the standard “A” and “B”.  In
most cases, the “-” signal corresponds to the “A” signal and the “+” signal corresponds to
the “B” signal, but some devices reverse this.  Refer to the chapter on Using RS-422 and RS-
485 Devices
 for more information on wiring and using 2-wire and 4-wire RS-422/485
networks with the iNS.

Summary of Contents for iNS/3000

Page 1: ...iNS 3000 and ixNS 3000 Hardware Manual SYSTECH C O R P O R A T I O N Document number 80 001083 0 Revision E 2...

Page 2: ...iption 3 28 08 E 1 Beta release 6 23 08 E 2 Updated panel drawings Added screw terminal descriptions Created 2008 and Protected Under the U S Copyright Act of 1976 Copyright 2008 SYSTECH Corporation A...

Page 3: ......

Page 4: ......

Page 5: ...5 CHAPTER 3 USING RS 422 AND RS 485 DEVICES 17 Connecting RS 422 485 Devices 17 RS 422 485 Point to point Configuration 17 RS 422 485 Bus Configurations 18 Two Wire System 18 Four Wire Systems 20 Usin...

Page 6: ......

Page 7: ...or more peripherals it manages network traffic routing it to the correct device For example the network diagram below shows how the iNS might be used to allow one or more PCs to share expensive periph...

Page 8: ...tiple mounting options High speed serial connections up to 230 4K baud Standard single RJ 45 10 100 Base TX Ethernet port 1Kv isolation on Ethernet ports Optional four port RJ 45 10 100 Base TX Ethern...

Page 9: ...10 100TX iNS 3202 2 No Four 10 100TX iNS 3204 4 No Four 10 100TX ixNS 3101 1 Yes One 10 100TX ixNS 3102 2 Yes One 10 100TX ixNS 3104 4 Yes One 10 100TX ixNS 3202 2 Yes Four 10 100TX ixNS 3204 4 Yes Fo...

Page 10: ......

Page 11: ...switch 3 Connect your peripheral device s to the iNS port server Attach each peripheral device e g PLC card reader modem etc to a serial port one of the DB 9 or screw terminal connectors 4 Plug the AC...

Page 12: ...rall status of the device The Port Status LEDs indicate the status of each serial port The LAN LED s indicate the status of the Ethernet connection s For information on interpreting the LED color and...

Page 13: ...unction 1 DCD I Signals module that remote device has a valid connection 2 RX I Serial data in from remote device to iNS 3 TX O Serial data out from iNS to remote device 4 DTR O Signals remote device...

Page 14: ...when they disconnect The cable shown in Figure 2 2 can be used to connect a DB 9 terminal or standard PC COM port directly to the iNS 3000 The DB 9 to DB 9 terminal cable diagrammed in Figure 2 4 is...

Page 15: ...ND 4 DTR 3 TX 2 RX 4 DTR 9 RI 7 RTS 8 CTS 5 GND 1 DCD 2 RX 3 TX 6 DSR Figure 2 4 DB 9 to DB 9 Terminal Cable The iNS 3000 does not require the use of all 9 wires Only the RX TX and GND signals are ess...

Page 16: ...evices to the iNS 12 DB 9 Pin Number DB 25 Pin Number Signal 1 DCD 9 RI 8 CTS 7 RTS 6 DSR 5 GND 4 DTR 3 TX 2 RX 8 DCD 22 RI 4 RTS 5 CTS 20 DTR 7 GND 6 DSR 3 RX 2 TX Figure 2 5 DB 9 to DB 25 3 wire Ter...

Page 17: ...for RS 422 and RS 485 RS 485 2 wire mode uses the same pinouts but the receive and transmit pairs should be externally shorted together in the connector TXA shorted to RXA and TXB shorted to RXB Note...

Page 18: ...tch via a standard straight through Ethernet cable iNS Remote iNS Remote Server iNS Router Router Server or Workstation Server or Workstation Internet Private Net Devices Devices Figure 2 7 Network To...

Page 19: ...tained an IP address and is ready to use Red indicates a fatal error Ethernet LEDs these LEDs will either be off or green A green LED means that a good Ethernet link has been established and the unit...

Page 20: ......

Page 21: ...All other topologies are expressly forbidden by the RS 485 specification This includes the following illegal configurations Connecting cables in any type of star topology regardless of whether or not...

Page 22: ...ral RS 485 devices on a bus but you cannot connect more than one RS 422 device on a single bus If your configuration includes an RS 422 device you must use a four wire connection Configurations includ...

Page 23: ...grammed in Figure 3 2 one pair of transmit and receive lines TXA and RXA are connected to a single wire and the other pair of transmit and receive lines TXB and RXB are connected to the second wire Th...

Page 24: ...equal to the wire s characteristic impedance generally 120 ohms If the RX data pins are not terminated at all and have nothing attached they may be susceptible to cross talk Data from other lines on t...

Page 25: ...e reset button is being held in this LED sequence means that the factory default configuration is about to be restored If you do not want to restore the factory default release the button before the s...

Page 26: ...ly 2 times per second Red Blinks Data errors will cause periodic red blinks Persistent red blinks may imply a configuration problem incorrect baud rate parity settings etc Solid Red Port hardware has...

Page 27: ...Optional 3Kv magnetic isolation on serial ports Standard 1Kv isolation on Ethernet ports Asynchronous port data rates of up to 230 4 Kbps DB 9 serial connectors on serial ports Screw Terminal connecto...

Page 28: ...ches x 8 5 inches x 1 75 inches 292 mm x 216 mm x 44 mm The unit may be mounted without modification on a shelf or desk top Attach the supplied rackmount brackets to the sides of the unit to mount it...

Page 29: ...ports isolated serial ports ixNS 3204 Four serial ports four 10 100 Base TX ports isolated serial ports Ethernet cabling specifications Guidelines for using 10 100 Base TX twisted pair cabling Recomme...

Page 30: ...ts pinouts 9 DB 9 to DB 25 3 wire terminal cable diagram 11 DB 9 to DB 25 modem cable diagram 10 DB 9 to DB 25 terminal cable diagram 10 DB 9 to DB 9 terminal cable diagram 11 default configuration 8...

Page 31: ...ctors 9 self test 14 sessions terminating on modem disconnect 9 specifications 21 start up 14 T terminal cable diagram DB 9 to DB 25 10 terminal cable diagram DB 9 to DB 9 11 termination RS 422 485 fo...

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