Allen-Bradley DH-485 User Manual Download Page 8 | Manualshive

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Allen-Bradley DH-485 User Manual Download Page 8

Product Overview

Chapter 1

13

Table 1.A

Protocol Applications

Protocol

PointtoPoint

MultiPoint

Fullduplex

Yes

No

Halfduplex

Yes

No

A description of these protocols is given in the Data Highway/Data
Highway Plus/DH-485 Protocol and Command Set Manual (publication
1770-6.5.16).

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Summary of Contents for DH-485

Page 1: ...DH 485 Communication Interface Cat No 1770 KF3 User s Manual...

Page 2: ...munications Operation in a residential area may cause unacceptable interference to radio and TV reception requiring the owner or operator to take whatever steps are necessary to correct the interferen...

Page 3: ...iderations 2 8 Modem Cabling Considerations 2 12 Voltage Selection 2 13 Replacing Fuses 2 14 Positioning the KF3 2 15 Configuring the KF3 3 1 Configuration 3 1 Basic Communication Parameters 3 5 Advan...

Page 4: ...terface A 1 DH 485 Interface A 1 Electrical A 1 Physical A 2 Environmental A 2 Diagnostic Command Support B 1 Diagnostic Loop B 1 Diagnostic Read B 2 Diagnostic Status B 4 Diagnostic Counter Reset B 5...

Page 5: ...dley DH 485 networks Publication Publication Number Data Highway Data Highway Plus DH 485 1770 6 5 16 Protocol and Command Set Manual SLC 500 Advanced Programming Software Manual 1747 801 PC DH 485 In...

Page 6: ...from this task Figure 1 1 The DH 485 Communication Interface 1770 KF3 Important The DH 485 Communication Interface module cat no 1770 KF3 will be referred to as the KF3 or the module throughout the re...

Page 7: ...es full or half duplex DF1 protocol data rate up to 19 200 baud cable length up to 50 feet point to point modem connection Block Check Character BCC or Cyclic Redundancy Check CRC16 error detection Th...

Page 8: ...Protocol Applications Protocol Point to Point Multi Point Full duplex Yes No Half duplex Yes No A description of these protocols is given in the Data Highway Data Highway Plus DH 485 Protocol and Com...

Page 9: ...ck panel of the KF3 including its two communication connectors The connector labelled RS 232 Computer connects to the host computer via an RS 232C cable The connector labelled DH 485 connects to the D...

Page 10: ...he shield reduces the effect of electromagnetic noise from the industrial environment Belden 9842 cable is recommended The pinouts for the KF3 s DH 485 connector are shown in Figure 2 2 Figure 2 2 KF3...

Page 11: ...e nodes at the end of the network must have an earth ground connection for the communication cable shield For the node at one end of the network whether it is the KF3 or some other device connect the...

Page 12: ...oupler with a 1747 C11 cable The KF3 is connected directly to the link coupler In this topology both the KF3 and the SLC 500 are end nodes Construct a cable to attach the DH 485 connector on the back...

Page 13: ...nk Coupler 1747 AIC 1747 C11 Cable SLC 500 Controller Link Coupler 1747 AIC 1747 C11 Cable SLC 500 Controller Link Coupler 1747 AIC This configuration requires the KF3 and three link couplers one SLC...

Page 14: ...t back no connection DH 485 Cable The cable connecting the second and third nodes of the multidrop network neither of which is an end station is shown in Figure 2 8 Figure 2 8 Connection Between Two I...

Page 15: ...ble consists of a number of daisy chained segments The total length of the combined segments must not exceed 4 000 feet Cut the cable segments long enough to route from one node to the next allowing s...

Page 16: ...A signal from the modem to the module that indicates the phone is off hook It is the modem s answer to DTR The module will not transmit or receive unless DSR is on If the modem does not control DSR pr...

Page 17: ...n serial port for an IBM AT and whether or not your computer uses standard IBM pinouts Figures 2 11 through 2 16 are for IBM computers with either 9 or 25 pin connectors If your computer has a differe...

Page 18: ...as shown in Figures 2 13 and 2 14 Figure 2 13 Jumper Positions for DSR and CTS Lines 25 pin KF3 Computer 1 TXD 2 RXD 3 GND 7 3 RXD 2 TXD 7 GND Shield 4 RTS 5 CTS 6 DSR 8 DCD 20 DTR Figure 2 14 Jumper...

Page 19: ...on to IBM Computer with Handshake Signals 25 pin KF3 Computer 1 TXD 2 RXD 3 RTS 4 3 RXD 2 TXD 5 CTS Shield 4 RTS 7 GND 20 DTR 6 DSR 8 DCD CTS 5 GND 7 DSR 6 DCD 8 DTR 20 Figure 2 16 Connection to IBM C...

Page 20: ...answering the phone whether it is ringing or not Since the KF3 asserts DTR at all times except during the hang up sequence the phone would always appear to be busy Do not use the KF3 with any type of...

Page 21: ...V power with the switch set to 115V can damage the module The power select switch is located on the back panel The switch is set at the factory for 115V operation 115V Operation Ensure the switch is s...

Page 22: ...only To guard against electrical shock or fire you must replace the cord with one approved for 230V AC by a recognized agency such as Underwriters Laboratories To match the KF3 receptacle the 230V pow...

Page 23: ...Screwdriver The KF3 is intended to sit on a flat surface such as a desk top or shelf It has been designed for operation in both control room and plant floor environments Where you place the KF3 is det...

Page 24: ...wo modes of operation run mode and configuration mode During normal operation the module functions in run mode Communication parameters are changed in configuration mode The module continues to commun...

Page 25: ...you hold the button down for more than 1 second the parameter numbers will advance automatically Data In configuration mode cycles through the possible communication parameters for the parameter show...

Page 26: ...ess the Data button to cycle through the available settings 4 When you have reached the desired data setting you can either save the setting and exit configuration mode or move on to configure the nex...

Page 27: ...the main menu without saving any changes Important If the module is left inactive i e with no buttons pressed in configuration mode for 3 minutes it will return to run mode Any changes will be lost If...

Page 28: ...factory default values as they appear in the display Table 3 B Basic Configuration Parameters Parameter Number Parameter Description Factory Default DH 485 Parameters DH 485 Node Address The address...

Page 29: ...00 or CRC16 Cyclic Redundancy Check 01 The application program running on the host computer must use the same error detection as the KF3 Refer to your application user s manual for information on the...

Page 30: ...portant Changing the default setting of these parameters can disrupt operation of the network Once in the submenu you change parameters and select parameters in the same manner as in the main menu usi...

Page 31: ...gher than the maximum token holder address value are not solicited to join the network but are removed from the network If you want to add new stations you must reset this parameter to a higher value...

Page 32: ...in 10 ms 0 01 second increments To calculate the delay multiply the number in the display by 0 01 seconds For example A setting of 50 means 50 x 0 01 0 50 seconds This parameter is only required when...

Page 33: ...e numbers 1 3 and then turn off If your DH 485 parameters are correctly configured the DH 485 Activity LED on the front of the module will light up If the Fault LED lights up instead check your statio...

Page 34: ...e is provided for compatibility with earlier DF1 products such as the 1770 KF2 Some users may prefer local mode for use in applications where the RS 232C link is not multidrop since it simplifies the...

Page 35: ...esponses from remote nodes on the DH 485 network will contain a destination address equal to that of the KF3 and not that of the half duplex master device The KF3 will respond to poll packets from the...

Page 36: ...DF1 addresses for each node on the DH 485 network In remote mode the KF3 appears transparent to the half duplex master so that remote SLC 500s can be polled directly as individual slaves on the half...

Page 37: ...351 10 012 052 112 152 212 252 312 352 11 013 053 113 153 213 253 313 353 12 014 054 114 154 214 254 314 354 13 015 055 115 155 215 255 315 355 14 016 056 116 156 216 256 316 356 15 017 057 117 157 2...

Page 38: ...ex Master Address set to the address of the 1771 KGM 010 Figure 4 2 Remote Mode Addressing KF3 101 01 SLC 500 100 00 SLC 500 102 02 SLC 500 103 03 SLC 500 104 04 DH 485 Modem GROUP 02 PLC 2 1771 KGM 0...

Page 39: ...s and with DH 485 slave devices The KF3 communicates with other master stations using the Allen Bradley programmable controller command set A detailed description of this command set is found in the D...

Page 40: ...e LTYP This one byte field defines the Link Type as follows 1 SRD Link Request 2 255 Reserved for future expansion Link STS LSTS This one byte field indicates the Link Status of the SRD request It is...

Page 41: ...KF3 and it does not know how to interpret it The KF3 currently recognizes only 01 as a valid link type Any other value for the link type will produce this link error Link Packet Information This fiel...

Page 42: ...is condition the modem will answer a call and assert DSR as soon as it detects ringing The KF3 does not monitor the ring indicator in the RS 232C interface Once it detects DSR the module starts a time...

Page 43: ...f the handshaking protocol is defeated by improper selection of modem options or by jumpers at the connectors the modem may still answer a call But if the connection is lost the modem will not hang up...

Page 44: ...d intervals when a station with the same address as this node is detected To correct the fault go into configuration mode and change the address of one of the stations to an unused one RS 232C Activit...

Page 45: ...onfiguration will not be possible EPROM Write Fault The Flash EPROM could not be burned correctly during download of new firmware This is a major fault requiring the module to be returned for servicin...

Page 46: ...will light up If this fails to happen check your RS 232C parameters Table 3 B Parameters 3 8 If you are unable to save new configurations successfully the left display will display hardware fault 6 an...

Page 47: ...1 Baud rates 300 1200 2400 4800 9600 19200 KF3 connector 6 pin Phoenix MSTBA 1 5 6 G AU Cable connector 6 pin Phoenix MSTB 2 5 6 ST AU Output RS 485 AC input voltage 85 132 VAC RMS 170 264 VAC RMS AC...

Page 48: ...gh Weight 2 lbs 9 kg approx Operating temperature 0 C to 60 C 32 F to 165 F Storage temperature 40 C to 85 C 40 F to 210 F Operating humidity 5 to 95 noncondensing Safety requirements UL 1950 Electrom...

Page 49: ...ink Parameters 06 0A You can use this command to check the integrity of the transmissions over the communication link The command message transmits up to 243 bytes of data to a node interface module T...

Page 50: ...given below Note that the address and size fields can have any value but they must be included Figure B 3 Diagnostic Read Command Format CMD 06 STS TNS FNC 01 1 byte 1 byte 2 bytes 1 byte ADDR 0000 S...

Page 51: ...10 Total RS 232C packets received low byte 11 Total RS 232C packets received high byte 12 Total RS 232C packets transmitted low byte 13 Total RS 232C packets transmitted high byte 14 Number of RS 232...

Page 52: ...mmand requests a block of status information from a DH 485 device The reply contains the information in its DATA field The status information varies from device to device The KF3 s status block is giv...

Page 53: ...Type 2C 4 Not Used 5 Series Revision Bits 0 4 Bits 5 7 0 Revision A 1 Revision B etc 0 Series A 1 Series B etc 6 16 Bulletin Name ASCII 1770 KF3 17 24 Product specific Information 0 This command rese...

Page 54: ...D 46 STS TNS DATA 1 byte 1 byte 1 byte 2 bytes 1 byte This command sets the link parameters defined for the KF3 and saves them in EEPROM Currently there is only one link parameter Maximum Token Holder...

Page 55: ...buttons 3 1 3 2 configuration mode 3 1 configuring the KF3 3 1 3 3 connection between a KF3 and a modem 2 12 between two intermediate nodes 2 6 for first segment of a multidrop network 2 6 for the las...

Page 56: ...4 3 5 3 7 3 8 3 10 fault 5 2 fault indicator LED 3 4 3 10 5 1 5 2 features 1 2 flow control 3 6 full duplex 1 2 4 1 fuse 2 1 2 14 A 1 G GND 2 8 grounding 2 2 group number 3 9 group numbers 4 3 H half...

Page 57: ...2 8 publications P 1 push buttons 3 1 3 2 operation 3 2 R read link parameters B 6 command format B 6 reply format B 6 receive data RXD 2 8 related products P 1 remote mode 3 9 4 1 4 3 addressing 4 5...

Page 58: ...inating 2 2 three wire connection to IBM computer 25 pin 2 9 9 pin 2 9 timeout 4 9 token hold factor 3 8 token passing 1 2 transmit data TXD 2 8 troubleshooting 5 1 TXD 2 8 U unable to save 5 3 V veri...

Page 59: ...d Street Milwaukee WI 53204 USA Tel 414 382 2000 Telex 43 11 016 FAX 414 382 2400 As a subsidiary of Rockwell International one of the world s largest technology companies Allen Bradley meets today s...

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