87001 RS-485 Communications Board User`s Manual
Contents
1. 1 5 Relay Output WARNING Use the relay for annunciator applications only Do not use it for control Relay Connectors A SPDT Relay is available through the three pins of the relay port terminal strip marked P5 The relay terminal strip is shown below The relay is a single pole double throw SPDT rated 6 87 Series RS 485 Communications Board Users Manual 120VAC 1A 3 Pin Relay Terminal Strip P5 Pin Normally Closed NC Common Normally Open NO Activate Relay A 87 series display can be programmed to activate the relay when a trigger point is reached The relay can also be activated serially by using the Relay command The Relay command string begins with the ASCII character R 52 hex 82 decimal Note that the R must be upper case and must be followed by one character which determines what relay action will occur The available actions are Action ASCII Character Hex Decimal Representation Turn relay on 1 31 hex 49 decimal Turn relay off 0 30 hex 48 decimal Sequence A A 41 hex 65 decimal Relay Sequence A is user definable as either a Delay On Relay or Cycle Relay VDP4 is required to change this parameter The Delay On Relay selection allows adjustment of the delay and duration time These settings are adjustable from 1 to 25 5 seconds The Cycle Relay selection allows specifying the ON time 1 to 25 5 seconds OFF time 1 to 25 5 seconds and number of cycles to perfor2. V Vorne Industries 87 001 RS 485 Communications Board User s Manual 1445 Industrial Drive Itasca IL 60143 1849 630 875 3600 Telefax 630 875 3609 Let installati n Aane a irae aes cate RS ea ew a dare rR ee ee 1 2 RS 422 Or RS 485 Communication To One Or More Displays Selecting RS 422 RS 485 Communication 0 c ccc cence ene nena e es RS 422 RS 485 Connectors 2 0 tenn e teen A Wiring Diagram For An RS 422 Or RS 485 Host Device To One Display f Wiring Diagram For An RS 422 Or RS 485 Host Device To More Than One Display Guidelines For Wiring RS 422 Or RS 485 Devices ccc cece cece cee eee 1 3 RS 232 Communication To More Than One Display 000eeeeeeeeee 1 4 Addressing Multiple Displays 0 c cece eee Unit Addres Serahan heme a eda eae esa de Nianeed setae tatew adios ba ed dad A aad aA Member of Group S ieri epea a a dar tibet cdade ad a A ere ede i 1 5 Relay QUtPUt os cceseataeuiek da o Sao ee E TE Relay GonnectOrs iie 0 sic vae anaia ae a a E AE te EE AA ENEN E e in D Activate Relay 2 ciaceceieeaced duals date wan pad panine ph edauiedyeaale caoea NEINAR EANAIR Notice Of Disclaimer While the information in this manual has been carefully reviewed for accuracy Vorne Industries Inc assumes no liability for any errors or omissions in the information Vorne Industries also reserves the right to make changes wi
3. 0 to 255 allowing up to 256 displays to be individually addressed in a network If a packet is directed to a specific unit address only units set to that address will respond to the data More than one display may use the same unit address Remember if the data in the packet is meant for a specific unit address the serial data type S must follow the lt SOH gt character in the transmission packet as shown in the examples below The following examples assume that Unit Address is set to 10 checksums are not being used and that Terminator has been selected as lt CR gt Also note that an upper case S follows the lt SOH gt indicating that the serial data is intended for an individual display address and the D command character is being used to display data To Show Only On Displays With A Unit Address Of 10 1234 lt SOH gt S 10 D1234 lt CR gt 888 8 lt SOH gt S10 D888 8 lt CR gt Member of Group s Member of Group s allows you to select any combination of up to eight display groups that the display can belong to A packet addressed to a specific group or combination of groups will only be acted on by displays belonging to the group s Available selections are 1 to 8 If a packet is directed to a group address only units set to that group address will respond to the data Remember if the data in the packet is meant for a group address the serial data type s must follow the lt SOH gt character in the transmission packet
4. 22 Receive Data RxD RS 422 Transmit Data TxD RS 422 Receive Data RxD 3 o o ooo o i HOST DEVICE cata 87 SERIES DISPLAY oj A oO N ooooo0o o o o0000000 Wiring Diagram For An RS 422 Or RS 485 Host Device To More Than One Display Below is a diagram which shows how to wire an RS 422 or RS 485 host device to multiple displays Please refer to the Guidelines For Wiring RS 422 Or RS 485 Devices section below for important wiring recommendations and take special note of the four terminating resistors shown in the diagram below 87 Series RS 485 Communications Board Users Manual PLC ec ai o oojoo o a Signal GROUND Isolated GROUND 1 p e RS 422 Receive Data RxD RS 422 Transmit Data TxD 2 5 5 y RS 422 Receive Data RxD A RS 422 Transmit Data TxD 3 l C i RS 422 Transmit Data TxD 3 RS 422 Receive Data RxD 4 L q a RS 422 Transmit Data TxD RS 422 Receive Data RxD 5 HOST DEVICE 1ST 87 SERIES DISPLAY Isolated GROUND RS 422 Transmit Data TxD RS 422 Transmit Data TxD RS 422 Receive Data RxD RS 422 Receive Data RxD Cda 2ND 87 SERIES DISPLAY a A j N x X i L I
5. ance of the cable A typical value is 120 ohms The terminating resistors must be placed at the two farthest ends 4 87 Series RS 485 Communications Board Users Manual of the RS 422 or RS 485 network regardless of where the host device is In some cases host device RS 422 and RS 485 ports have built in or optional terminating resistors Take care to check that your network whether it has one display or 32 displays has only two sets of terminating resistors 6 In applications with multiple displays bring the communication wiring point to point In other words do not run stubs from the backbone network wiring to each display If you find it absolutely necessary to run a stub from the backbone network wiring make sure it is under one foot in length 1 3 RS 232 Communication To More Than One Display With the RS 485 option board installed 87 Series displays have a built in data converter that can be used to convert host device RS 232 data to RS 485 data and vice versa This allows the host device to communicate via RS 232 to one 87 Series display called the converting display which will retransmit any RS 232 data received from the host device as RS 485 data to all other displays in the network Likewise any RS 485 data received by the converting display from other displays in the network will be retransmitted out its RS 232 port to the host device To wire a network of displays that can be communicated to from one host device RS 232
6. m adjustable from to 255 times The following examples assume that addressing and checksums are not being used and that Terminator has been selected as lt CR gt Also note that the header of the packet lt SOH gt s has the effect of broadcasting to all displays overriding any group or individual address a display might be set to Turn the relay on lt SOH gt s R1 lt CR gt Turn the relay off lt SOH gt s RO lt CR gt Trigger Sequence A lt SOH gt s RA lt CR gt 87 Series RS 485 Communications Board Users Manual 7
7. munication This switch is located on the plug in communication board next to P4 COM PORT terminal strip To enable the 87 series display to receive data via the RS 485 port set this switch to the RS 485 position RS 422 RS 485 Connectors The RS 422 RS 485 port is fully opto isolated and is available through the five pins of the communication port terminal strip marked P4 The RS 422 RS 485 portion of this terminal strip is shown below 2 87 Series RS 485 Communications Board Users Manual Pins 1 to 5 RS 485 Terminal Strip Isolated Communications Ground RS 422 RS 485 Transmit Data TxD Z Z Z Z Z RS 422 RS 485 Transmit Data TxD RS 422 RS 485 Receive Data RxD 1 2 3 4 5 RS 422 RS 485 Receive Data RxD Wiring Diagram For An RS 422 Or RS 485 Host Device To One Display Below is a diagram which shows how to wire an RS 422 or RS 485 host device to one display Please refer to the Guidelines For Wiring RS 422 Or RS 485 Devices section below for important wiring recommendations and take special note of the four terminating resistors shown in the diagram below For one way communication from the host to the display the transmit data TxD lines from the display pins 2 and 3 do not need to be connected ay i Signal GROUND Isolated GROUND RS 422 Receive Data RxD RS 422 Transmit Data TxD RS 422 Receive Data RxD zg RS 422 Transmit Data TxD RS 422 Transmit Data TxD z3 2 RS 4
8. port follow these steps Step 1 Wire your host device RS 232 port to the first display s RS 232 port as described in Section 1 5 RS 232 Communication To A Single Display of the 87 Series Display manual This display will be the converting display Make sure to set the COM PORT slide switch to the RS 232 position only for the converting display All other displays in the network should have the COM PORT slide switch set to the RS 485 position Step 2 Use the converting display s RS 485 port to connect to other displays in the network as described in Section 1 2 RS 422 Or RS 485 Communication To One Or More Displays Where RxD of the converting display is connected to RxD of the other displays in the network and RxD of the converting display is connected to RxD of the other displays in the network 1 4 Addressing Multiple Displays Using an RS 422 or RS 485 network together with addressing allows a host computer or PLC to communicate with specific individual displays or groups of displays in a network Each display in the network may be assigned a unit address and a group address If you do not need to address individual displays or groups of displays simply leave the displays set to their default address of 0 and skip this section 87 Series RS 485 Communications Board Users Manual 5 Unit Address Unit Address is programmable selection that allows you to select an individual unit address Individual unit addresses can range from
9. solated GROUND 1 RS 422 Transmit Data TxD 2 RS 422 Transmit Data TxD 3 7 F l RS 422 Receive Data RxD 4 L M 4 RS 422 Receive Data RxD 5 LAST 87 SERIES DISPLAY Guidelines For Wiring RS 422 Or RS 485 Devices For best results when wiring RS 422 or RS 485 devices please follow these guidelines 1 Use a 4 000 foot maximum total cable length 2 Use a maximum of 10 displays connected to one RS 422 host port or 32 displays connected to one RS 485 host port unless your host device specifies a higher number 3 Use a shielded cable with the shield connected to Earth Ground only at the 87 Series display Belden 9843 is a recommended cable 4 Carefully check your equipment and cable to ensure that Earth Ground is not connected at both ends of the cable If there is a significant difference in Earth Ground potential between the two ends of the cable it could cause data transmission errors or even damage to the RS 422 or RS 485 communication ports 5 Terminate the cables In all RS 422 and RS 485 installations the cable must be correctly terminated with two sets of resistors one set at each end of the network This applies even if you are only using one display connected to one host device The terminating resistors prevent reflection problems that can interfere with data transmission The resistance value of the terminating resistors should match the characteristic imped
10. thout further notice to any products described in this manual 87 Series RS 485 Communications Board Users Manual 1 1 Installation The RS485 option board allows 87 series displays to communicate serially using RS 485 In addition a SPDT relay is provided for annunciation The RS 485 add on board can be installed thru the access plate of a 87 series display WARNING SHOCK HAZARD Always completely disconnect power from the display before opening the user access plate Do not reapply power to the display until the access plate has been reinstalled and securely closed Remove power Remove six screws holding the access plate in place Remove the 14 position shunt plugged into the socket labeled OPTION BOARD Slide the RS 485 board thru the access plate Slide the board into the bottom most card slot Nn BP WN Align the two mounting posts attached to the RS 485 board with the two mounting holes on the logic board Snap the RS 485 board in place 8 Plug the ribbon cable into the OPTION BOARD socket 9 Installation complete J 1 2 RS 422 Or RS 485 Communication To One Or More Displays This section provides the information necessary to successfully interface a host RS 422 or RS 485 port to one or more 87 display equipped with the RS 485 Add on board Selecting RS 422 RS 485 Communication A printed circuit board mounted COM PORT slide switch is used to select between RS 232 and RS 422 RS 485 com
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