Omega Vehicle Security PTC900 Module 8 REAL-TIME Clock Parameters, SET Time SET Date, Set Day

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COMMUNICATION FORMAT

Data is transferred from the meter through a serial communication channel. In serial communications, the voltage is switched between a high and low level at a predetermined rate (baud rate) using ASCII encoding. The receiving device reads the voltage levels at the same intervals and then translates the switched levels back to a character.

The voltage level conventions depend on the interface standard. The table lists the voltage levels for each standard.

Start Bit and Data Bits

Data transmission always begins with the start bit. The start bit signals the receiving device to prepare for reception of data. One bit period later, the least significant bit of the ASCII encoded character is transmitted, followed by the remaining data bits. The receiving device then reads each bit position as they are transmitted.

LOGIC

INTERFACE STATE

RS232*

RS485*

 

 

 

 

1

mark (idle)

TXD,RXD; -3 to -25 V

a-b < -200 mV

 

 

 

 

0

space (active)

TXD,RXD; +3 to +25 V

a-b > +200 mV

 

 

 

 

* Voltage levels at the Receiver

Data is transmitted one byte at a time with a variable idle period between characters. Each ASCII character is “framed” with a beginning start bit, an optional parity bit and one or more ending stop bits. The data format and baud rate must match that of other equipment in order for communication to take place. The figures list the data formats employed by the meter.

Character Frame Figure

Parity Bit

After the data bits, the parity bit is sent. The transmitter sets the parity bit to a zero or a one, so that the total number of ones contained in the transmission (including the parity bit) is either even or odd. This bit is used by the receiver to detect errors that may occur to an odd number of bits in the transmission. However, a single parity bit cannot detect errors that may occur to an even number of bits. Given this limitation, the parity bit is often ignored by the receiving device. The meter ignores the parity bit of incoming data and sets the parity bit to odd, even or none (mark parity) for outgoing data.

Stop Bit

The last character transmitted is the stop bit. The stop bit provides a single bit period pause to allow the receiver to prepare to re-synchronize to the start of a new transmission (start bit of next byte). The receiver then continuously looks for the occurrence of the start bit. If 7 data bits and no parity is selected, then 2 stop bits are sent from the meter.

6.8 MODULE 8 - REAL-TIME CLOCK PARAMETERS (

) - PTC901

PARAMETER MENU

 

Module 8 is the programming module for the Real-Time Clock (RTC) Date and Time Parameters. In the Display Mode, the DAT annunciator indicates the RTC Date is currently being shown. The RTC Time display is shown with no annunciator. This programming module can only be accessed if a Real-Time Clock card is installed.

SET TIME

«

ª

SET DATE

«

ª

This parameter sets the Date for the Real-Time Clock. Selecting will display the sub-menu where the Date can be set or changed. The RTC Date is entered in “Month.Day.Year” format (two-digit values). When the PAR key is

pressed, the new Date is entered. Select

to advance to the next parameter

without changing the Date.

 

This parameter sets the Time for the Real-Time Clock. Selecting will display the sub-menu where the Time can be set or changed. The RTC Time is entered in “Hours-Minutes”, 12-hour format, with AM/PM indication. When the PAR key is pressed, the new Time is entered and begins running. The “Seconds” always start from 00 when the Time is entered. Select to advance to the next parameter without changing the Time.

ª

« MONTH.DAY.YEAR

SET DAY

ª

«HOURS-MINUTES Am/Pm

«

ª

Set the Day of the week for the Real-Time Clock.

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Contents User’s Guide Servicing North America Safety Summary General DescriptionTable of Contents General Meter SpecificationsOptional PLUG-IN Cards and Accessories Communication Cards LDP6-CDCSetpoint Cards LDP6-CDS Installing the Meter Setting the JumpersIndicates factory setting Installing PLUG-IN Cards Wiring the MeterTo Install TOP ViewAC Power DC Power Sinking LogicSourcing Logic Setpoint PLUG-IN Card Terminals Sourcing Output Logic CardSinking Output Logic Card RS232 CommunicationsMeter automatically adjusts the minutes Reviewing the Front Buttons and DisplayTime synchronization between multiple With the HostProgramming the Meter Programming MenuModule 1 Timer Input Parameters Parameter MenuModule 2 User Input and Front Panel Function KEY ParametersDsp RtC-dRtC-t SP-1 SP-2SP-3 SP-4Module 3 Display and Program LOCK-OUT Parameters Module 5 Timer Operating Modes Module 4 Cycle Counter ParametersDLYINt INt-LINP OP Module 6 S Etpoint a Larm P Arameters LAtCHOUt « toTimer Stop TIMER/COUNTER Auto ResetOutput Reset with Display Reset Setpoint POWER-UP StateModule 7 Serial Communications Parameters SPNtStrStp Command Chart Command String ConstructionRegister Identification Chart Command String ExamplesAuto/Manual Mode Register MMR ID U Abbreviated TransmissionMeter Response Examples Setpoint Output Register SOR IDModule 8 REAL-TIME Clock Parameters SET Time SET DateSET DAY 12-59p +B/Module 9 Factory Service Operations Restore Factory DefaultsProblem Remedies Press DSP key to return to the Display ModeSp0f-2 Sp0f-3Sp0f-4 USEr-2SP-1 SP-2 SP-3 SP-4 ASM-nACt-n OUt-nPTC900/PTC901 Programming Quick Overview Accessories Part Number InformationWARRANTY/DISCLAIMER Shop online at omega.com

PTC900 specifications

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