Watlow Electric 945 Series How To Use Manual
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3WATLOW Series 945How to Use Data CommunicationsThis manual is a supplement to the Series 945 User's Manual. It is for users withthe data communications option. Use in conjunction with the Series 945 User'sManual.This is expert user-level material and requires previous experience with datacommunications.Two Serial Hardware Interfaces andTwo Software ProtocolsDepending on your units model number, you may have one of two hardwareinterfaces:1)RS-422A for a "multidrop" or (multiple device) network, up to ten devices total;with 4000 ft. network length limit, or RS-423A (RS-232C compatible) for one onone communication with a 50 ft. network length limit with a 945 and a hostcomputer (945A-XXXX--B000). Selecting RS-422A or RS-423A is user select-able via internal switches. See Page 7.2)EIA-485 (945A-XXXX-D000) also for a multidrop network, up to 32addresses total, and with a 4000 ft. network length limit.There are two protocols available to you. Depending on the type of network youneed, you must use the correct combination of interface and protocol.We use ANSI X3.28 Protocol, based on ANSI X3.28 - 1976 Subcategories 2.2,and A3, with the RS-422A and EIA-485 interface to run a multiple device network.We also use XON/XOFF Protocol, a simpler protocol, to run a two device networkwith an RS-423A interface. XON/XOFF will also work with the RS-422A and EIA-485 interface, but the network is limited to two devices (one computer or printerand a Series 945). XON/XOFF Protocol requires no responses to messages likethe ANSI X3.28 Protocol does. Likewise, ANSI X3.28 Protocol, which provides aresponse to every message, will work with the RS-423 interface. But again you arelimited to one Series 945 and a host computer or printer.To select which protocol you are going to use, go into the SETUP menu and usethe MODE key to advance to the Prot parameter. Select either FULL, for ANSIX3.28 2.2 - A.3, or On for XON - XOFF.If you are using ANSI X3.28 Protocol, choose an address number for the controlunder the Addr parameter following the Prot parameter. This parameter will onlyappear if Prot = FULL.Communications WiringTo connect your Series 945 to a computer or printer, use the next three pages as areference. Your computer or printer hardware manual will provide more detailedserial port pin information. Also refer to the noise prevention section in Appendix 1of the Series 945 User's Manual. In the often noisy environments of industriallocations, it is important not to take noise isolation lightly.How to Use Data Communicationswith the Watlow Series 945Data Comm |
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