Despatch Protocol Plus Modbus Communications - Manual (Page 3)

Chromalox Instruments and Controls
A-51643 Rev. 6 10/06/03 ii
Table of Contents
1 OVERVIEW ........................................................................................................................................................ 1
1.1 P URPOSE ....................................................................................................................................................... 1
1.2 C ONVENTIONS AND DEFINITIONS .................................................................................................................. 1
2 COMMUNICATIONS SPECIFICATIONS ..................................................................................................... 2
2.1 S UPPORT S PECIFICATIONS ............................................................................................................................. 2
2.2 T IMING S PECIFICATIONS ............................................................................................................................... 2
2.3 W IRING ......................................................................................................................................................... 2
2.4 C OMMUNICATION C ARD I NSTALLATION AND J UMPER S ETTINGS .................................................................. 3
2.4.1 Communication Card (0113-10175) Installation..................................................................................... 3
2.4.2 Communication Card Jumper Settings .................................................................................................... 5
3 REGISTER AND I/O MAPPING ..................................................................................................................... 6
3.1 U NMAPPED AND R ESERVED R EGISTERS ........................................................................................................ 6
3.2 R EGISTER Q UANTITY L IMITATIONS .............................................................................................................. 6
3.3 D ISCRETE I NPUT A SSIGNMENTS .................................................................................................................... 6
3.4 D ISCRETE O UTPUT A SSIGNMENTS ................................................................................................................ 6
3.5 I NPUT R EGISTER A SSIGNMENTS .................................................................................................................... 8
3.6 H OLDING R EGISTER A SSIGNMENTS ............................................................................................................ 10
4 APPLICATION OPERATIONS ..................................................................................................................... 15
4.1 S ECURITY L EVEL AND D ISCRETE I NPUTS , D ISCRETE O UTPUTS , AND R EGISTER A CCESS ............................ 15
4.2 M ULTIPLE R EGISTER W RITE L IMITATIONS ................................................................................................. 15
4.3 C ONTROL O PERATION AND R UN /H OLD /S TOP F UNCTIONS .......................................................................... 16
4.4 C ONTROLLER M ODE AND D ATA A CCESS .................................................................................................... 16
4.5 M ONITORING AND A CKNOWLEDGEMENT OF A LARMS , E VENTS , AND C YCLE C OMPLETE , D ISCRETE I NPUTS ,
AND D ISCRETE O UTPUTS .......................................................................................................................................... 17
4.6 E VENT S ETUP V ALUES ................................................................................................................................ 18
4.7 K EYPAD L OCKOUT ...................................................................................................................................... 18
4.8 T EMPERATURE V ALUES .............................................................................................................................. 18
4.9 T IME V ALUES ............................................................................................................................................. 18
4.10 H IGH L IMIT S ETPOINT AND B AND R EGISTERS ............................................................................................ 18
4.11 B ROADCASTING WITH G UARANTEED D ELIVERY ......................................................................................... 18
4.12 C OMMUNICATION P ARAMETER A DJUSTMENTS ........................................................................................... 19
5 FUNCTION SET DETAILS ............................................................................................................................ 20