Maple-systems OIT Family (ASCII) Manual do Utilizador Página 1

TABLE OF CONTENTSOPERATION...1Definition of an Operator Interface Terminal 1Connecting the OIT to an ASCII Host ...2Serial

Resend Last Transmission CommandESC Q terminatorDescription: Causes the OIT to resend the last transmission the OIT sent to the ASCIIhost. This comman

Write String CommandESC S memaddr textstring terminatormem addr = 0000 to 1023 (The starting D register address in decimal, base 10,format must be fou

ASCII StringsSent from the OITASCII strings are sent from the OIT to the ASCII host for three reasons:•in response to a control command sent from the

Message Request Register (MRR)The Message Request Register is an OIT data register that is continuously monitored by theOIT. When the ASCII host enter

Sample Status Bit Coil AddressesOIT Coil Register Address Status Bit928929930931932933934935936937938939940941942943Reserved for OITInvalid Display Me

higher priority alarm that has a continuous alert tone or shut down critical parts of thesystem in case a hazardous potential exists. When the stack i

Key CoilsThere are three blocks of discrete OIT coil registers that are used to pass keypress data from theOIT to the ASCII host: Function Key coils,

A maximum of 25 register monitors can be displayed on each screen. If more than one regis-ter monitor is on a screen, each register monitor is updated

host and how the OIT notifies the ASCII host of OIT register updates. Regardless of the operatingmode, the OIT always immediately responds to control

Below is a sample session showing an ASCII host communicating with three OITs on a multidropnetwork. The OITs have network addresses of 1, 30, and 100

The purpose of this manual is to describe how the OIT Family Operator Interface Terminals operate when using theASCII Slave protocol and to explain th

Performance ConsiderationsOIT Memory RequirementsMaple Systems’ OIT Family products have FLASH memory for storing program code, pro-tocol code, and sy

Local Setup ModeThe OIT has a local setup mode which can be accessed by pressing the Setup key on the nu-meric keypad. On the OIT3160 and OIT4160 mode

Bypass ModeAny OIT with a printer port (OIT3250/OIT4450/OIT5400) is capable of allowing a com-puter connected to one of the OIT’s serial ports to comm

FEATURESDisplayThere are several display options available on the OIT Family Operator Interface Terminals,including 2-line by 20-character VFD and bac

FEATURES 231010-0088, REV02OIT3200/OIT3250 Extended Character SetOIT4400/OIT4450 Extended Character SetOIT5400 Extended Character Set

Stored ScreensEach Maple OIT is capable of displaying up to 500 pre-programmed screens of text andgraphics characters. Screens are created for:•Provid

Recipe ScreensRecipe screens can be used to setup a batch process that utilizes some predetermined numberof ingredients. For example, a plastics facto

Like message screens, recipe screens are capable of:•displaying text and characters from the extended character set•displaying up to 25 register monit

2. All alarms are stored in an alarm stack which is internal to the OIT. The alarm stackensures that all alarms that are sent to the OIT by the ASCII

The alarm condition has now been confirmed by the OIT operator, so the OIT now silencesthe alarm buzzer, clears the alarm LED, sets the Acknowledge Al

The illustration of an OIT5400, shows the features typically found on an OIT Family Opera-tor Interface Terminal (not all features are available on al

Additional Rules for Alarms:1. Once an alarm is displayed, pressing the Alarm Ack key acknowledges the alarm causingthe OIT to display the prior scree

Like message screens, menu screens are capable of:•displaying text and characters from the extended character set•sending the screen contents to a pri

Message ChainOften, an event will occur which requires a message to be sent to the OIT operator that maybe longer than the space provided on one scree

When Screen #1 is displayed on the screen, a “->“ symbol is displayed in the lower right cornerof the screen. The symbol indicates that Screen #1 i

Register MonitorsThe OIT’s data and coil registers can be monitored, displayed, and updated by the OIT. Thisis done by configuring the OIT screens to

The OIT notifies the ASCII host with the Notify Host of R/W Register Update command:ESC X memarea memaddr length data STXmem area = C or D (register b

Long: This format is used to represent a 32-bit register or two consecutive 16-bit registers inthe OIT as a signed long integer value with a range of

On/Off Coil: This format is used to represent a single coil in the OIT as a binary value with“Off” indicating the coil is off and “On” indicating that

ASCII String: This format is used to represent a single coil in the OIT as a binary value withuser-definable strings that will indicate whether the co

Adjustable Decimal Point Location: Each register monitor placed onto a screen may have adecimal point placed anywhere within the register monitor’s fi

What You Will NeedThe table, below, lists the items necessary to program a Maple Systems OIT Family OperatorInterface Terminal and then connect it to

OITware 200 configuration software, you can select either left or right justification (line allcharacters up with the left or right margin).Hide Data

Note: When the OIT operator enters data into a register monitor that has the AdjustableDecimal Point Location enabled, the OIT operator does not enter

verted to 34ºF. Technically, this is inaccurate since 1ºC = 33.8ºF. Fortunately, this canbe corrected by simply using a different formula. If the conv

Message StackingThe OIT has two operating modes for screens requested by the ASCII host:Standard ModeEach screen request sent to the OIT is immediatel

When message stacking is enabled, some OIT’s have a Message Stack LED which lights upto indicate a message is in the message queue. The OIT can also d

Menu SelectionMenu screens can be created which allow access to other message, recipe, or menu screensby the press of a numeric key on the OIT’s keypa

Timer EventThe OIT can be configured to set a coil in the OIT coil registers at a particular time during a particu-lar day of the week or daily (examp

Function KeysEach OIT has 6, 12, or 16 global function keys which can be programmed to display mes-sages, send ASCII strings to the ASCII host, and tu

Retentive ModeThe Retentive Mode option was designed for OITs that are communicating to PLCs. Whenthe OIT powers up in Retentive Mode, the OIT sets th

Screen Display Function KeyA screen can be tagged to a function key so that whenever the function key is pressed, thatscreen is displayed on the OIT.

OIT to PC Wiring for OIT ConfigurationThe OIT must be configured for a particular protocol before use. The OITware 200 configu-ration software is used

sage key to display the prior screen or by configuring the password protected screen with thetimed display feature.Disabled Function KeyIf the functio

Screen Display: When the function key is pressed (simulating an “on” state), a prepro-grammed screen is displayed on the OIT but a predefined ASCII st

ClearThe Clear key performs three functions. If an alarm is active, pressing the Clear key turns offthe buzzer. In local setup mode, pressing the Clea

LEDsStatus LEDsEight status LEDs are reserved on the OIT for monitoring eight Status LED coils (OIT coilregisters). Each status LED is assigned to a p

Function Key LEDsThe LEDs of the function keys can be individually programmed to be controlled by the OITor by the ASCII host. If a function key LED i

CustomizationSlide-In LegendsMany of the OIT Family Operator Interface Terminals have clear windows for slide-in leg-ends. You can easily create your

APPENDIX A: OIT SettingsASCII Host to OIT Communications SettingsWhen starting a new project file for the OIT using OITware 200, you must enter the Co

Function Key LED Coils (if applicable)Default: C896Range: C0 to C1023The function key LED coils register is the 16-bit register that the OIT reads for

Other Important OIT SettingsTurnAround DelayDefault: 0 msecRange: 0 to 65535 msecTurnAround delay is the amount of time that the OIT waits before resp

APPENDIX B: CablingCabling ConsiderationsWhen an OIT Family Operator Interface Terminal is configured with the ASCII Slave proto-col, it can communica

OIT to ASCII Host Wiring for OIT OperationAfter the OIT has been configured for a particular protocol, it must be wired to the ASCIIhost. The Figure,

RS-485 Network CablingIMPORTANT! The OIT3200B, OIT3250B, OIT3600B, OIT4400B, OIT4450B, andOIT5400 have a jumper that must be moved to Position B when

60 OIT Family Operation Manual (ASCII)1010-0088, REV02HOST TERMINATION120 OhmTx+Tx-Rx+Rx-SIGNAL GNDCHASSIS GNDFROM HOST +FROM HOST -TO HOST +TO HOST -

Operational DescriptionThe OIT Family Operator Interface Terminals can read from and write to internal memory reg-isters. The OIT stores predefined me

•Except for the command initiator (ESC control character) and the command or lineterminator, all other characters sent by the host must be ASCII print

Error CodesCode Description Cause0 No Error OIT received proper control command1 Timeout ErrorOIT did not receive the entire command (including the co