Campbell Scientific LR4 Four Channel Latching Relay Module - Manual (Page 5)

LR4 Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. General Description.....................................................1
2. Specifications ..............................................................1
3. Relay Details ................................................................2
4. Contact Details.............................................................2
4.1 Types ........................................................................................................2
4.2 Relay Contact Life ....................................................................................3
5. Manual Toggle Control ................................................3
6. LED Indicators .............................................................4
7. Using SDI-12.................................................................4
7.1 SDI-12 Wiring ..........................................................................................4
7.2 SDI-12 Addresses .....................................................................................5
7.3 SDI-12 Commands ...................................................................................5
7.4 SDI-12 Programming Examples for CRBasic Datalogger .......................7
7.4.1 Reading Relay Status Values ..........................................................7
7.4.2 Setting Relay Values.......................................................................7
7.4.3 CR200(X) Programming.................................................................7
7.5 Edlog Set Relay Example .........................................................................8
8. Using Modbus ..............................................................9
8.1 Wiring for Modbus ...................................................................................9
8.1.1 RS-232 ............................................................................................9
8.1.2 RS-485 ..........................................................................................10
8.2 Modbus Baud Rate .................................................................................11
8.3 Modbus Mode.........................................................................................11
8.4 Modbus Address .....................................................................................11
8.5 Modbus Supported Commands...............................................................11
8.6 Modbus Operation ..................................................................................11
9. Firmware Update Procedure .....................................12
i