Standard modem, Cable, ModemTB-1 OCM, 110 | Siemens 7ML19985AB01

Modem Communication

Communication with the OCM-3 over an answer back telephone modem is relatively straight forward. For modem communication over conventional telephone lines, a maximum of 1200 or 2400 baud is recommended. Generally, a lower baud rate is more reliable on noisy lines. Modem should be self answering and data checking capability turn on.

The Milltronics Utilities software can be run via modem. In addition the Terminal Emulation program of the Utilities software package can be used to send control sequences directly to the modem.

The remote modem is defined as the modem connected to the OCM-3. The local modem is defined as the modem connected to the computer.

It should be noted that the modem responses listed in the following discussion serve only to typify what is presently common in current field of RS-232 communication.

standard modem	local modem
cable

computer

telephone lines

remote modem

OCM-3

modemTB-1

2

3

7

OCM - 3

RS 232

I/O

T R C

X X O

D D M

11 12 13

DB-25 connector

7ML19985AB01

OCM III

110

Image 109

Siemens 7ML19985AB01 instruction manual Standard modem, Cable, Computer Telephone lines Remote modem, ModemTB-1 OCM, 110

Contents

Open channel Contact Smpi Technical Publications at the following address Unit Repair and Excluded Liability Table of Contents General Keypad Initial Start Up Fundamental Checks Start UPOperation Appendices Maintenance Error Codes 100 Communications 101 7ML19985AB01 OCM Short About thisIf you want to know about Read Product OCM » range 20 or 4-20 mA » resolution Specifications» 20 to 50 C -5 to 122 F IP65 enclosure » CE *, FM, CSA NRTL/C Programmer Transducer Temperature SensorCabling Auxiliary Input Communication SoftwareOutput » Belden Installing the OCM-3 InstallationOutline and Mounting OCM-3 Layout OCM-3 System DiagramCustomer device Installing the Temperature Sensor Installing the TransducerGround shield at OCM-3 only Basic Wiring Temperature Sensor Ground shield at OCM-3 only Relays MA Output Synchronization AC Power Power ConnectionsDC Power Installing the Programmer Installing the Memory BACK-UP BatteryDisconnect power before installing or replacing the battery Communicating VIA Computer General Start UPKeypad OCM-3 is asking which language you prefer to communicate Initial Start UPLanguage English F13 auto zero calibration 160 Completed 7ML19985AB01 P0 language English P1 dimensional units Centimeters 24-hr. time 1141114100 Enter new time F5 ddmmyyyy date October 12 Fundamental Checks OCM Memory OperationSecurity Units Display Flow CalculationAbsolute vs. ratiometric = constant Damping For battery operation, set display lighting to off or auto Example For relay For battery operation, have relays energizing on alarm» 20 mA » P6 * flow rate Flow Rate and Totalizing FAIL-SAFEFlow rate Capacity Logging Viewing the data log Blanking TemperatureTime and Date Reset Emulation Mode Auxiliary Head Input Flow Velocity InputVoltage Input Current Input As normal 7ML19985AB01 DC Output Diagnostic Aids100% head 4 m, enter 5 m ‘D’ Parameter Listing Security access requiredVelocity Nominal target range OCM ‘F’ Parameter Listing Enter security code Emulation modeKeypad to mA output OCM Linear Velocity ‘P’ Parameter Listing= centimetres = absolute = ratiometric Flow rate units Flowrate VolumeGallons = imperial million gallons per day OCM = 4-20 mA = 0-20 mA 7ML19985AB01 OCM OCM Variable condition FixedUnits OCM ‘U’ Parameters for P3 Primary Element OCM Reference U0 = exponent U1 = k factor P4 = 0 only= constant factor U1 = head Typical Weir Profiles Typical SHARP-CRESTED Weirs Khafagi Venturi Typical Parshall Flume Typical Leopold Lagco ‘U’ parameters required ‘U’ parameters calculated BS-3680 Rectangular Flume = crest width = Cv = crest height = Cd = crest length = a BS-3680 Round Nose Horizontal Crest Weir ¤ Refer to Operation \ Flow Calculation 7ML19985AB01 Cv = velocity coefficient BS-3680 Trapezoidal Flume BS-3680 U-Flume, P3 = BS-3680 U-FLUME = head H and p applied to C = crest width = C = crest height = Cp = crest length BS-3680 Finite Crest Weir = approach width = Ce = crest width = K b = crest height = Ce x 2⁄3 ⎯⎯√2⎯g x be x he1.5 Where q = flow rate= gravitational acceleration = crest width He = effective head h + Kh = head Kh = 1 mm BS-3680 Thin Plate Rectangular Weir U0 = notch angle Alpha U1 = Ce BS-3680 Thin Plate V-NOTCH Weir U0 = crest width b Rectangular Weir Contracted = hydraulic radius = slope of hydraulic gradient Based on the Manning Formula Round Pipe U0 = maximum flume width, hmax PALMER-BOWLUS Flume U0 = maximum listed head, hmax Flume U0 = number of data points n, 4 to Universal Head vs FLOW, P3 = Flow, point A15 Head, point A16 Flow, point A13 Head, point A14Flow, point A17 Head, point A18 Flow, point A19 U0 = channel width B U1 = area h Rectangular Area X Velocity = head, cm = flow velocity, cm/sec Trapezoidal Area X Velocity For h ≥ d = B b/d Where q = flow rate, l/s= channel top width, cm = head, cm = channel base width, cm Modified Trapezoidal Area X Velocity U0 = base diameter D U1 = area h Channel Area x Velocity U0 = conduit diameter U1 = area h Circular Area X Velocity GULL-WING Area X VELOCITY, P3 = Gull Wing Area X Velocity EGG-SHAPED Area X VELOCITY, P3 = EGG-SHAPED Area X Velocity Typical open channel Universal Area X VELOCITY, P3 = Area Head Universal Area X VelocityA10 = OCM Maintenance Error Codes Computer Customer’sSerial printer 102 Protocol for the OCM-3 is as follows Baud rate DB-25 connector DB-9 connectorBipolar Current Refer to Cvcc Instruction P35 = 7, print interval set for 7 minutes Date104 Remote OCM-3 display Local display Utilities Software Programmer Remote OCM-3 programming105 106 Display value Typical OCM-300.000000 99.12399.123000 7ML19985AB01 107 Response # = 0 through Content of P5 Stop data log down load Start data log down load109 Standard modem DB-25 connector 7ML19985AB01Cable Computer Telephone lines Remote modem Connect Establishing Communication111 112 Ending Communication Rev