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TCIC User’s Manual

 

 

24

3.6   Cold Junction Temperature 

Displays the temperature of the cold junction, which is essential for  
the CJC (Cold Junction Compensation). The value of the cold junction 
temperature is meaningful only when the Input Type is some 
thermocouple; i.e., it’s irrelevant in case the Input Type is mV (or, of 
course, None). 
 

Содержание TCIC

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Страница 3: ...2 3 Library 3 2 3 1 Load 3 2 3 2 Save 3 2 3 3 Delete 3 3 Outputs Box 3 4 Save to File Command Start or Stop 3 5 Channel Boxes 3 5 1 Channel Title 3 5 2 Digital Display 3 5 3 Analog Display 3 5 4 Chann...

Страница 4: ...s the most popular families of thermocouples E J K R S T or any indefinite voltage source in the range 500mV 500mV USB as a standard method of communication USB RS485 and RS232 option Multiple boards...

Страница 5: ...setpoint indication that is turn the output on upon crossing the limit either upwards or downwards In other words the direction of the trigger is user defined Likewise the user may define a hysteresis...

Страница 6: ...you want to switch to the other driver first uninstall the retired one The direct driver provides access via a DLL supplying functions to directly control the device The VCP Virtual COM Port driver wo...

Страница 7: ...such exists The reason for that is that there are cases where the installation procedure automatically communicates with manufacturer s site which might lead to wrong operation 3 3 Connect the TCIC c...

Страница 8: ...TCIC User s Manual 6 3 5 Press Next and select the second option 3 6 Press Next and browse to the Direct DLL driver folder...

Страница 9: ...TCIC User s Manual 7 3 7 Click Next 3 8 Press Continue Anyway...

Страница 10: ...TCIC User s Manual 8 Click Finish that s it...

Страница 11: ...4 1 If the Direct DLL Driver is installed uninstall it as follows Click Start Control Panel Add or Remove Programs FTDI FTD2XX USB Drivers Change Remove Disconnect all TCIC boards from the USB port an...

Страница 12: ...TCIC User s Manual 10 4 3 The Found New Hardware Wizard appears Select the last option like this 4 4 Press Next and select the second option...

Страница 13: ...TCIC User s Manual 11 4 5 Press Next and browse to the VCP driver folder 4 6 Click Next...

Страница 14: ...steps 4 3 4 6 2 The package includes also an RS232 terminal found on the Web called Termite through which the TCIC may be communicated when the VCP driver is installed Termite http www compuphase com...

Страница 15: ...ted is reported in the title More than one TCIC board may be connected to the PC while using the TCIC Monitor the user should select the required board It is legitimate to run the TCIC Monitor twice o...

Страница 16: ...TCIC User s Manual 14 The markings in the screenshot below show the section where each part of the display is described...

Страница 17: ...2 Menus The menus enable various operations as described below 3 2 1 File 3 2 1 1 Exit Leaves the TCIC Monitor program 3 2 2 Setup 3 2 2 1 Card Settings Adjusts the settings that reside in the card on...

Страница 18: ...view only Input Type None TC E TC J TC K TC R TC S TC T mV Each channel may be referred to as one of three main types Channel not in use None In this case channel s description section 3 5 4 will show...

Страница 19: ...witch On limit Now there are still some points to clarify The user may define two characteristics of the setpoint indication How will the indication stop i e output goes off Automatically or manually...

Страница 20: ...description more comprehensible some examples follow Example 1 Output Mode SP Auto On 100 Off 90 The output will go high on when the temperature rises from 99 to 100 and back low off upon falling fro...

Страница 21: ...ing Rate Max 0 5 Sec seconds Channel Settings Channel Name Input Limits Min Max The settings in detail Common Settings The following are common settings for all the channels Temperature Unit C F view...

Страница 22: ...hannel Settings The following are individual settings for each channel Channel Name The user may assign a name to each channel This name is displayed as Channel Title refer to section 3 5 1 giving the...

Страница 23: ...to its initial factory settings All channels set to voltage reading Input Type mV Temperature Unit C All Output Modes Manual All Setpoints both switch on and switch off 0 Reference Voltage 1 25V Card...

Страница 24: ...mains in effect 3 2 3 2 Save Saves the current setting set into the library 3 2 3 3 Delete Deletes a setting set from the library 3 3 Outputs Box This box both describes the status of the 8 outputs an...

Страница 25: ...S TCIC MONITOR TCIC_Readings 3 5 Channel Boxes 3 5 1 Channel Title Displays the Channel Name refer to section 3 2 2 2 3 5 2 Digital Display Displays current channel s reading Reading s unit is C F or...

Страница 26: ...e temperature of the cold junction which is essential for the CJC Cold Junction Compensation The value of the cold junction temperature is meaningful only when the Input Type is some thermocouple i e...

Страница 27: ...ch value is padded to have a fixed length of 8 characters so the string has a fixed length of 72 characters excluding the CR LF That is the contents of the string is Channel 1 reading tab character Ch...

Страница 28: ...F 3 The response on the O command excluding the CR LF 4 Card Filter level 5 CR LF That is the contents of the string is Channel 1 reading tab character Channel 2 reading tab character Channel 3 readin...

Страница 29: ...ange Output Status The one character a command turns output 1 off The one character A command turns output 1 on Similarly the one character b through h and B through H commands turn the other channels...

Страница 30: ...limit trigger on downwards change When current reading is smaller than switch on limit output goes on If the channel is defined as Latch the output remains on until turned off manually If the channel...

Страница 31: ...owed by CR E g to set switch off limit for channel 3 to 145 2 the PC would send c145 2 with CR Note the c is the channel selection If the string is accepted as valid the TCIC returns OK with CR LF and...

Страница 32: ...uired command in the User Command Box 2 Select the proper C R mode One or two character commands do not require C R so C R should be unchecked Three or more character commands do require C R so C R sh...

Страница 33: ...t work The TCIC Monitor however works fine A Opening COM port 10 or above is done differently Prefix to its name For example In C CreateFile COM10 In VB Net Creates a COM Port stream handle Dim COM_Na...

Страница 34: ...communication with a card that has a specific address and de activates de selects the communication with all other cards in the system Once a card is selected regular communication can take place i e...

Страница 35: ...ring a Card Address Configuring a card address is carried out by the TCIC Monitor utility Connect the card to be configured to the USB port In the TCIC Monitor utility click Setup Card Address and cho...

Страница 36: ...uired E g sending e will SELECT the board that has the address e Note the TCIC does not send any answer on a command Once selected a TCIC board will respond to the main command set and the STATUS LED...

Страница 37: ...D M F cable can be used for direct connection to a standard 9 way D type PC COM port RS485 line termination placing a jumper across the two leftmost pins of LK2 puts a 120 Ohm ac coupled impedance acr...

Страница 38: ...the LK1 LK5 jumpers in the USB side Option 2 External 5V supply Put the LK1 jumper in the DC JACK side Put the LK5 jumper in the NOT USB side The external supply should be 5V DC 5 only Using USB hubs...

Страница 39: ...5 bus Factory set baud rate of 115 200 baud 7 3 Analog Inputs 8 fully differential inputs for connection to floating thermocouples or floating millivolt sources Full scale differential input is 500mil...

Страница 40: ...llivolt measurement accuracy cold junction compensation and conversion to temperature using the onboard conversion functions 7 5 Switch Outputs Connection is via a 10 way screw terminal connector 3 81...

Страница 41: ...be either via USB using Virtual COM Port drivers supplied with the TCIC or through direct RS232 or RS485 COM ports If USB communication is being used then the TCIC USB drivers must be installed prior...

Страница 42: ...TCIC User s Manual 40 Figure 1 output screen of the LabVIEW sample Figure 2 LabVIEW s MAX Measurement and Automation Explorer...

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