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Chapter 2

232DTT1795 Manual

B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 434-7094

Figure 1. Relay Output Connection

When connecting a mechanical relay coil, or any inductive

load to the DTT outputs, a reverse bias diode must be connected
across the load to protect the DTT output against large voltages
caused by the inductive load.

The DTT outputs can handle a maximum voltage of 40V

and a maximum current of 100mA. Do not use a relay with coil
ratings exceeding these values.

+12VDC

12VDC
RELAY
COIL

DTT OUTPUT

GND

TCOM

RELAY
CONTACT

Содержание 232DTT

Страница 1: ...AX 815 434 7094 B B Electronics Mfg Co Inc P O Box 1040 Ottawa IL 61350 PH 815 433 5100 FAX 815 434 7094 Internet http www bb elec com sales bb elec com techsupt bb elec com B B Electronics April 1995...

Страница 2: ...ICATIONS 1 RS 232 CONNECTIONS 2 CHAPTER 2 232DTT FUNCTIONS 3 DIGITAL THERMOMETER 3 PROGRAMMABLE THERMOSTAT 3 CHAPTER 3 232DTT DATA FORMAT 5 CHAPTER 4 232DTT COMMANDS 7 READ TEMPERATURE 7 READ STATUS 7...

Страница 3: ...rt RTS DTR high Thermostat thresholds programmable in non volatile registers Status Register latches if thermostat outputs have tripped Packing List Examine the shipping carton and contents for physic...

Страница 4: ...an external supply the supply should be connected only to specifically labeled power inputs power jack terminal block etc Connecting an external power supply to the handshake lines may damage the uni...

Страница 5: ...it is powered the thermostat outputs will be serviced Three open collector outputs provide thermostatic controls These outputs are current sinking low when on high impedance high when off 1 THIGH Turn...

Страница 6: ...il or any inductive load to the DTT outputs a reverse bias diode must be connected across the load to protect the DTT output against large voltages caused by the inductive load The DTT outputs can han...

Страница 7: ...necessary go to step 6 If character is decimal 1 then continue with step 2 2 Use the NOT function of your programming language to invert or complement the value in the second character 3 We need to i...

Страница 8: ...ge these steps look like this DTT data has been stored in CHAR1 and CHAR2 negative ASC CHAR1 ASCII val of sign char 1 or 0 reading ASC CHAR2 ASCII val of reading IF negative 1 THEN reading NOT reading...

Страница 9: ...rguments none Response temperature reading in 9 bit two s complement format shown in boldface Dec Example 0RT 0 46 ASCII Example 0RT NUL Description The decimal 0 NUL followed by decimal 46 equivalent...

Страница 10: ...36 ASCII Example 0RL NUL Description The TL register contains decimal 0 ASCII NUL and decimal 36 ASCII This converts to a temperature of 18 C When the current temperature is 18 C the low thermostat ou...

Страница 11: ...r and will not change until this command is issued again After sending the Set Low Thermostat command delay for at least 10 ms to allow the DTT to program the register NOTE After programming the 232DT...

Страница 12: ...ware is installed on your hard disk the following files should be located in the 232DTT directory 232DTT_W EXE VBRUN300 DLL and MSCOMM VBX To set up the 232DTT under windows follow the following steps...

Страница 13: ...ng command the second character is a zero all commands must be in capital letters 0RT 4 The DTT will respond with two characters indicating temperature Room temperature is usually NUL followed by a ch...

Страница 14: ...4A J 106 6A j 11 B VT ctrl K 43 2B 75 4B K 107 6B k 12 C FF ctrl L 44 2C 76 4C L 108 6C l 13 D CR ctrl M 45 2D 77 4D M 109 6D m 14 E SO ctrl N 46 2E 78 4E N 110 6E n 15 F SI ctrl O 47 2F 79 4F O 111 6...

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