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SIMPLIFIED MANUAL TUNING PROCEDURE FOR PID CONTROLLERS-cont.
CONNECTOR PIN DESIGNATIONS-cont.

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 955-257 SECTION 5-DIGITAL COMMUNICATIONS 5.1 COMMUNICATIONS IDENTIFICATION The specific type of digital communications circuitry provided in the controller is indicated by the second digit of the ten digit part number. MODEL 2001 MODEL 2002 MODEL 2003 MODEL 2004 TYPE E0- Z0- EA- ZA- No digital communications E1- Z1- EB- ZB- No digital communications E2- Z2- EC- ZC- RS232C non-isolated E3- Z3- ED- ZD- RS232C isolated E4- Z4- EE- ZE- RS422 non-isolated E5- Z5- EF- ZF- RS422 isolated E6- Z6- EG- ZG- 20mA Current loop isolated The communications circuitry is located on the middle circuit board of the electronic assembly.  This board plugs into the front bezel assembly and connects to the rear "D" connector by means of a flexible flat ribbon cable that plugs into the bottom edge of the communications circuit board. 5.2 COMMUNICATIONS CONNECTOR The  "D"  Type  (DB25S)  25-PIN  digital  communications  connector  located  at  the  rear  of  the  controller  is  a  standard Electronic Industries Associates (EIA) interface for RS232C.  RS422 and 20 mA current loop use the same connector. Wiring to the controller is identical to that for any Data Terminal.  The following table identifies each connector pin by function.  Sections 5.55.7 specify the specific wiring for the three available interfaces. 5.3 CONNECTOR PIN DESIGNATIONS PIN MNEMONIC SIGNAL DESCRIPTION 1 GWG Protective In the RS232C environment this line provides a Ground ground connection between devices.  Although not required, may also be used for RS422 and 20 mA current loop configurations for the same purpose. 2 TX Send Transmits data within RS232C voltage levels Data (+12V and-12V) or RS422 voltage levels (0 and 5V differential).  Also used by the 20 mA current as 20 mA input (user supplied) for the transmit loop. 3 RX Receive Accepts data within  RS232C or RS422 voltage Data levels or used by the 20 mA current loop as 20 mA input (user supplied) for the receive loop. 4 RTS Request This line is normally held inactive by the to Send controller until a message is ready to be sent.  Then the line is switched active and the controller waits for the clear to send. ECLIPSE INSTRUMENTATION DIVISION page 3-1104







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