Megmeet MTCV Thermostat Quick Start
Megmeet MTCV is a thermostat designed for industrial applications. It offers features like thermocouple input, RS485 communication, and multi-segment control for accurate temperature regulation. It's suitable for various environments but should be installed horizontally and kept away from flammable materials. Multiple copper wires are recommended for wiring, ensuring quality and safety.
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MTCV series thermostat quick start 3. Installation Note: this manual takes MTCV-16NT as an example. Other models are 3.1Environment temperature subject to the actual model. Ambient temperature range: -5℃ ~ 55℃. Thank you for using MTCW series thermostat of Megmeet . Before using 3.2Installation occasion the product, please carefully read this booklet so as to better understand it, fully use it, and ensure safety. ◆ Please do not use it in the environment where there are flammable, explosive, corrosive gases or liquids. This user manual is to offer you a quick guide to the design, installation, ◆Please do not mix metal or wire debris into the product, or it may connection and maintenance of MTCV series thermostat, convenient for cause fire or malfunction. on-site reference. Briefly introduced in this booklet are the hardware ◆ In order not to hinder the heat dissipation, please keep the air specs, features, and usage of MTCV series thermostat, plus the circulation around the product. optional parts and FAQ for your reference. ◆ Use of environmental humidity <85%RH, no condensation. For more information, see the MTCV series thermostat user manual. 3.3 Installation method This manual is suitable for the following members of the MTCV series: MTCV-16-NT MTCV-08-NT MTCV-04-NT Version:1.0 Data:2018-12-07 BOM: 1. Appearance and part name The product shall be installed horizontally on the back panel of the electric cabinet, and the distance between the product and the equipment or cabinet wall above and below shall be no less than 20cm. Installation in other directions is not conducive to the product itself heat, and the product under the heat must not have equipment. Install and fix with DIN slot DIN slot of 35mm width can be used for installation under low vibration environment. Open the DIN clasp at the bottom of the module and clip the bottom of the module on the DIN guide rail; The rotating module is close to the DIN guide rail and close the DIN clasp. Carefully check whether the DIN clasp on the module is tightly fixed with the DIN guide rail. Install and fix with screws In case of large vibration, screws must be used to fix the module. M3 can be used to fix the module on the back plate. The overall size and mounting hole size of this module are shown in the following. Figure. 2. Introduction current detection:N:No current detection input C:Current detection input Output method:R:Relay output T:Transistor output V:Voltage output I:Current output M:Mixed output N:No output Special function : Depending on the function, use 1, 2, 3...... To distinguish. 3.4 Cable connection and specification When wiring products, it is recommended to use multiple copper wires and prefabricate insulated terminals to ensure the quality of wiring. The recommended cross sectional area and type of wire are shown in the following table. Cable Communication terminal(3PIN) Communication terminal(2PIN) Positi on Allowed cable number Recommended stripping length Side 12~30AWG 6.5mm Side 12~30AWG 6.5mm Top Ethernet cable / User input terminal Top (12PIN) 16~26AWG 10~15mm Ethernet(RJ45) installa tion Screw mounting Screw mounting In-line installa tion In-line installa tion 1 Communication terminal(6PIN) Top 16~26AWG 10~15mm In-line installa tion 4.2 User connection mode For security (to prevent electric shock and fire accident), and reduce the noise, the module of grounding terminal shall be in strict accordance with the national electrical code requirements, grounding resistance should be less than 100 Ω. When more than one module is grounded, single point grounding should be adopted. The ground wire cannot form a circuit. As shown in the following figure 4. Terminal Introduction 4.1User terminal MTCW-12-NT terminal silk screen 5 things to pay attention to when wiring: User terminal definition table Remark 24V+,24V- Description Input power DC 24V Ground A0,B0 RS485(COM0) Channels 1 to 16 are positive for thermocouple T1+~T16+ signal input Channels 1 to 16 are negative for thermocouple T1-~T16signal input The external cold junction compensation is CJ+,CJpositive and negative. (Note) Y01~Y08,COM0 Switch output port channel 1~8 Y09~Y16,COM1 Switch output port channel 9~16 Note : CJ+ and CJ- are external thermocouple cold end compensation terminals (optional), connected with PT100 thermal resistance. When the connection is not connected or the measured value exceeds the range of 1 All the input and output signal connections and communication cables shall be shielded layer cables. 2 The thermocouple signal uses the compensation line, the dividing number should be consistent, positive and negative to correspond. 3 The signal cable should be away from other cables that may cause electromagnetic interference, such as the unavoidable set of metal pipe or wire slot. 4 The metal case of thermocouple should be grounded reliably. 5 The thermostat grounding PGND should be good grounding. 5. Electrical indicator 5.1 Power indicator Item Unit Min value Typical value Max value Input voltage range Vdc 20 24 30 Input current A / 0.08 / Normal start-up and working range Normal temperature rated full load 5.2 Performance indicators -20℃ ~ 80℃, it is automatically switched to the internal cold end compensation. Remark Input signal Item Thermocoup le type Indicator K、J、E、N、T、R、S、B Power supply voltage circuit: 5V ~ 24V; The Transistor maximum circuit power supply voltage circuit: Input output with 30V; Loop current: 0.3A /24Vdc; Leakage current method open gate when open:<0.1mA/30Vdc;Minimum load:5mA (5Vdc~24Vdc) 1~100,the unit is 0.1s.The specific value is Fast determined by the characteristics of the temperature controlled object Control cycle 1~100,the unit is 1s.The specific value is Slow determined by the characteristics of the temperature controlled object Control method ON/OFF,Hand,PID Rated Type K -100℃~1200℃(-148℉~2192℉) 2 Item temperat Type J ure range Type E Type N Type T Type R Type S Type B Thermoco Accuracy uple Environmental compensation error Isolation Indicator -100℃~1200℃(-148℉~1112℉) -100℃~850℃(-148℉~1562℉) -100℃~1200℃(-148℉~2192℉) -200℃~300℃(-328℉~572℉) 0℃~1600℃(32℉~2912℉) 0℃~1600℃(32℉~2912℉) 400℃~1800℃(752℉~3272℉) Full range ±0.3% <1℃(external cold end compensation) Isolation between sampling channel and power supply, isolation between sampling channel and output, isolation between channels and channels, communication and power supply isolation 5.3 Communication specification Name Communication protocol Port remark Communication method Communicatio n port Modbus RTU slave A0,B0 RS485 5.4 Indicator description Name Status Indicator PWR ON 24V power supply is normal RUN Flashes quickly (10Hz~15Hz) Flashes slowly (0.5Hz~1Hz) There is an error, see # 3612, # 3613 for the error status COMM0 Flashes Normal communication Y01~Y16 ON Corresponding channel output is ON Normal 6. BFM MODBUS supports 01, 03, 05, 06 and 16 functions. 01, 05 function code to the bit register operation, 03, 06, 16 function code to the integer register operation, if read the undefined register, will get 0 value. Up to 100 BFM units can be read or written at a time. CH1 CH9 1500 Measured value(PV) 1508 1532 Heating side control output(MV) 1540 Multi-segment 1564 control of current 1572 execution segment 1596 Working status word 1604 Digital filter set 1628 of one step 1636 1788 D0 1796 1820 D1 1828 1724 A0 1732 1756 A1 1764 1660 Input type 1668 1692 Set value(SV) 1700 Proportional cycle 1852 time 1860 1884 Heat side proportional band 1892 Heat side integral 1916 time 1924 Function 1948 1956 1980 Control action 1988 2012 Heat/cool action 2020 2044 Hand output value 2052 2076 Adjust sensitivity 2084 2108 Auto-tuning deviation 2116 Step 1 temperature 2140 2148 Heat side derivative time CH2 CH10 1501 1509 1533 1541 1565 CH3 CH11 1502 1510 1534 1542 1566 CH4 CH12 1503 1511 1535 1543 1567 CH5 CH13 1504 1512 1536 1544 1568 CH6 CH14 1505 1513 1537 1545 1569 CH7 CH15 1506 1514 1538 1546 1570 CH8 CH16 1507 1515 1539 1547 1571 1573 1574 1575 1576 1577 1578 1579 1597 1605 1629 1637 1789 1797 1821 1829 1725 1733 1757 1765 1661 1669 1693 1701 1853 1861 1885 1893 1917 1925 1598 1606 1630 1638 1790 1798 1822 1830 1726 1734 1758 1766 1662 1670 1694 1702 1854 1862 1886 1894 1918 1926 1599 1607 1631 1639 1791 1799 1823 1831 1727 1735 1759 1767 1663 1671 1695 1703 1855 1863 1887 1895 1919 1927 1600 1608 1632 1640 1792 1800 1824 1832 1728 1736 1760 1768 1664 1672 1696 1704 1856 1864 1888 1896 1920 1928 1601 1609 1633 1641 1793 1801 1825 1833 1729 1737 1761 1769 1665 1673 1697 1705 1857 1865 1889 1897 1921 1929 1602 1610 1634 1642 1794 1802 1826 1834 1730 1738 1762 1770 1666 1674 1698 1706 1858 1866 1890 1898 1922 1930 1603 1611 1635 1643 1795 1803 1827 1835 1731 1739 1763 1771 1667 1675 1699 1707 1859 1867 1891 1899 1923 1931 1949 1957 1981 1989 2013 2021 2045 2053 2077 2085 2109 2117 2141 1950 1958 1982 1990 2014 2022 2046 2054 2078 2086 2110 2118 2142 1951 1959 1983 1991 2015 2023 2047 2055 2079 2087 2111 2119 2143 1952 1960 1984 1992 2016 2024 2048 2056 2080 2088 2112 2120 2144 1953 1961 1985 1993 2017 2025 2049 2057 2081 2089 2113 2121 2145 1954 1962 1986 1994 2018 2026 2050 2058 2082 2090 2114 2122 2146 1955 1963 1987 1995 2019 2027 2051 2059 2083 2091 2115 2123 2147 2149 2150 2151 2152 2153 2154 2155 Step 2 2172 2173 2174 2175 2176 2177 2178 2179 1temperature 2180 2181 2182 2183 2184 2185 2186 2187 Step 3 temperature 2204 2212 Step4 temperature 2236 2244 2268 Step 5 temperature 2276 2300 Step 6 temperature 2308 2332 Step 7 temperature 2340 2364 Step 8 temperature 2372 2396 Step 1 time 2404 2428 Step 2 time 2436 2460 Step 3 time 2468 2205 2213 2237 2245 2269 2277 2301 2309 2333 2341 2365 2373 2397 2405 2429 2437 2461 2469 2206 2214 2238 2246 2270 2278 2302 2310 2334 2342 2366 2374 2398 2406 2430 2438 2462 2470 2207 2215 2239 2247 2271 2279 2303 2311 2335 2343 2367 2375 2399 2407 2431 2439 2463 2471 2208 2216 2240 2248 2272 2280 2304 2312 2336 2344 2368 2376 2400 2408 2432 2440 2464 2472 2209 2217 2241 2249 2273 2281 2305 2313 2337 2345 2369 2377 2401 2409 2433 2441 2465 2473 2210 2218 2242 2250 2274 2282 2306 2314 2338 2346 2370 2378 2402 2410 2434 2442 2466 2474 2211 2219 2243 2251 2275 2283 2307 2315 2339 2347 2371 2379 2403 2411 2435 2443 2467 2475 2492 2493 2494 2495 2496 2497 2498 2499 2500 2524 2532 2556 2564 2588 2596 2620 2628 2652 2660 2684 2692 2716 2724 2748 2756 2780 2788 2812 2820 2844 2852 2876 2501 2525 2533 2557 2565 2589 2597 2621 2629 2653 2661 2685 2693 2717 2725 2749 2757 2781 2789 2813 2821 2845 2853 2877 2502 2526 2534 2558 2566 2590 2598 2622 2630 2654 2662 2686 2694 2718 2726 2750 2758 2782 2790 2814 2822 2846 2854 2878 2503 2527 2535 2559 2567 2591 2599 2623 2631 2655 2663 2687 2695 2719 2727 2751 2759 2783 2791 2815 2823 2847 2855 2879 2504 2528 2536 2560 2568 2592 2600 2624 2632 2656 2664 2688 2696 2720 2728 2752 2760 2784 2792 2816 2824 2848 2856 2880 2505 2529 2537 2561 2569 2593 2601 2625 2633 2657 2665 2689 2697 2721 2729 2753 2761 2785 2793 2817 2825 2849 2857 2881 2506 2530 2538 2562 2570 2594 2602 2626 2634 2658 2666 2690 2698 2722 2730 2754 2762 2786 2794 2818 2826 2850 2858 2882 2507 2531 2539 2563 2571 2595 2603 2627 2635 2659 2667 2691 2699 2723 2731 2755 2763 2787 2795 2819 2827 2851 2859 2883 2884 2885 2886 2887 2888 2889 2890 2891 3036 3044 3068 3076 3164 3037 3045 3069 3077 3165 3038 3046 3070 3078 3166 3039 3047 3071 3079 3167 3040 3048 3072 3080 3168 3041 3049 3073 3081 3169 3042 3050 3074 3082 3170 3043 3051 3075 3083 3171 3173 3174 3175 3176 3177 3178 3179 3197 3198 3199 3200 3201 3202 3203 Step 4 time Step 5 time Step 6 time Step 7 time Step 8 time Repeat start step Repeat end step Repeat count The value alarm 1 The value alarm 2 The value alarm 3 The value alarm 4 Cooling side control output (MV) Overlap/Deadband Undershoot suppresion factor Heat side proportional band 3172 adjusting factor Heat side integral 3196 3 band adjusting factor Heat side derivative band adjusting factor Cool side proportional band adjusting factor Cool side integral band adjusting factor Cool side derivative band adjusting factor PID group selection Regional action Region 1 Region 2 Region 3 Regional hysteresis Operation output ratio Manipulation output offset Output selection Heat side proportional band 1 Heat side integration time 1 Heat side derivative time 1 Heat side proportional band 2 Heat side integration time 2 3204 3205 3206 3207 3208 3209 3210 3211 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 5735 5743 6855 6863 6887 6895 6919 6927 6951 6959 6983 6991 6791 6799 6823 6831 7339 7347 6023 5736 5744 6856 6864 6888 6896 6920 6928 6952 6960 6984 6992 6792 6800 6824 6832 7340 7348 6024 5737 5745 6857 6865 6889 6897 6921 6929 6953 6961 6985 6993 6793 6801 6825 6833 7341 7349 6025 5738 5746 6858 6866 6890 6898 6922 6930 6954 6962 6986 6994 6794 6802 6826 6834 7342 7350 6026 5739 5747 6859 6867 6891 6899 6923 6931 6955 6963 6987 6995 6795 6803 6827 6835 7343 7351 6027 5740 5748 6860 6868 6892 6900 6924 6932 6956 6964 6988 6996 6796 6804 6828 6836 7344 7352 6028 5741 5749 6861 6869 6893 6901 6925 6933 6957 6965 6989 6997 6797 6805 6829 6837 7345 7353 6029 5742 5750 6862 6870 6894 6902 6926 6934 6958 6966 6990 6998 6798 6806 6830 6838 7346 7354 6030 6031 6032 6033 6034 6035 6036 6037 6038 6055 6063 6087 6095 6183 6056 6064 6088 6096 6184 6057 6065 6089 6097 6185 6058 6066 6090 6098 6186 6059 6067 6091 6099 6187 6060 6068 6092 6100 6188 6061 6069 6093 6101 6189 6062 6070 6094 6102 6190 6191 6192 6193 6194 6195 6196 6197 6198 6215 6223 6247 6255 6343 6216 6224 6248 6256 6344 6217 6225 6249 6257 6345 6218 6226 6250 6258 6346 6219 6227 6251 6259 6347 6220 6228 6252 6260 6348 6221 6229 6253 6261 6349 6222 6230 6254 6262 6350 6352 6353 6354 6355 6356 6357 6358 6376 6384 6408 6416 6504 6377 6385 6409 6417 6505 6378 6386 6410 6418 6506 6379 6387 6411 6419 6507 6380 6388 6412 6420 6508 6381 6389 6413 6421 6509 6382 6390 6414 6422 6510 6512 6513 6514 6515 6516 6517 6518 6536 6544 6568 6576 5768 6537 6545 6569 6577 5769 6538 6546 6570 6578 5770 6539 6547 6571 6579 5771 6540 6548 6572 6580 5772 6541 6549 6573 6581 5773 6542 6550 6574 6582 5774 5776 5777 5778 5779 5780 5781 5782 5800 5808 5832 5840 5864 5801 5809 5833 5841 5865 5802 5810 5834 5842 5866 5803 5811 5835 5843 5867 5804 5812 5836 5844 5868 5805 5813 5837 5845 5869 5806 5814 5838 5846 5870 5872 5873 5874 5875 5876 5877 5878 5896 5904 5897 5905 5898 5906 5899 5907 5900 5908 5901 5909 5902 5910 Heat side derivative time 2 Heat side proportional band 6351 3 6375 Heat side integration time 3 6383 6407 Heat side derivative time 3 6415 Heat side 6503 proportional band 6511 4 6535 Heat side integration time 4 6543 6567 Heat side derivative time 4 6575 Cool side 5767 proportional band 5775 1 5799 Cool side integration time 1 5807 5831 Cool side derivative time 1 5839 Cool side 5863 proportional band 5871 2 5895 Cool side integration time 2 5903 Cool side derivative time 2 Cool side proportional band 3 Cool side integration time 3 Cool side derivative time 3 Cool side proportional band 4 Cool side integration time 4 Cool side derivative time 4 Energy saving time proportional action Energy saving delay time Main side / auxiliary side selection Time ratio secondary channel Control start / stop (lower four bits are valid) 5927 5935 5959 5928 5936 5960 5929 5937 5961 5930 5938 5962 5931 5939 5963 5932 5940 5964 5933 5941 5965 5934 5942 5966 5967 5968 5969 5970 5971 5972 5973 5974 5991 5999 6119 6127 6151 5992 6000 6120 6128 6152 5993 6001 6121 6129 6153 5994 6002 6122 6130 6154 5995 6003 6123 6131 6155 5996 6004 6124 6132 6156 5997 6005 6125 6133 6157 5998 6006 6126 6134 6158 6159 6160 6161 6162 6163 6164 6165 6166 6279 6287 6311 6319 6280 6288 6312 6320 6281 6289 6313 6321 6282 6290 6314 6322 6283 6291 6315 6323 6284 6292 6316 6324 6285 6293 6317 6325 6286 6294 6318 6326 7111 7113 7121 7114 7122 7115 7123 7112 7116 7124 7117 7125 7145 7147 7155 3356 Set the rate of change to limit the 3364 rise 3388 Set the rate of change to limit the 3396 decline Selection of 3420 temperature control object 3428 characteristics 3452 Control algorithm 3460 selection 6695 Auto-tuning 6703 algorithm 3484 PID output upper 3492 limit setting 3516 PID output lower 3524 limit setting Error status word (system error) Error status word (broken even error) Set value range error address Channel characteristics confirmation command Auto-tuning setting value Reset Change settings allowed CH1-CH16 multi-stage control execution 7148 7149 7156 7157 3628 7118 7126 7119 7127 7120 7128 7146 7150 7158 7151 7159 3930 7152 7153 7160 7161 3629 7154 7162 3931 3357 3358 3359 3360 3361 3362 3363 3365 3366 3367 3368 3369 3370 3371 3389 3390 3391 3392 3393 3394 3395 3397 3398 3399 3400 3401 3402 3403 3421 3422 3423 3424 3425 3426 3427 3429 3430 3431 3432 3433 3434 3435 3453 3454 3455 3456 3457 3458 3459 3461 3462 3463 3464 3465 3466 3467 6696 6697 6698 6699 6700 6701 6702 6704 6705 6706 6707 6708 6709 6710 3485 3486 3487 3488 3489 3490 3491 3493 3494 3495 3496 3497 3498 3499 3517 3518 3519 3520 3521 3522 3523 3525 3526 3527 3528 3529 3530 3531 3612 3613 3616 3617 3624 3625 3637 3640 3640 3644 3648 3649 4 flag Alarm 1 mode setting Alarm 2 mode 3656 setting Alarm 3 mode setting Alarm 4 setting Alarm dead zone setting Alarm delay times Operation amount 6727 selection at alarm 6735 6759 Operation amount at the time of 6767 alarm External input status Cold junction temperature Module parameter saving Module software version information Thermostat identification code Bit1:Remain Bit2:Hardware malfunction Bit3:Parameter setting error Bit4:Cold junction temperature compensation error Bit5:Remain Bit6:Remain Bit7~Bit15:Remain Bit0 ~ Bit15 broken couple detection POWER and other LED are off Power supply is damaged Module damaged Check and confirm: whether the voltage between 24V + and 24V- terminals is within the normal range Module shutdown or crash Replace the module 3664 RUN LED is off or on 3668 6728 6736 6760 6729 6737 6761 3672 6730 6731 6738 6739 6762 6763 6768 6769 6770 6771 3680 6732 6740 6764 6733 6741 6765 6734 6742 6766 6772 6773 6774 RUN LED flashes slowly The output cannot be turned off (OFF) The output status indicator is inconsistent with the actual output status 3681 The serial port cannot communicate normally 3620 3684 3688 ON(1) When any one of b1 ~ b7 is 1, this flag is 1. - AD converter or other hardware failure, all channels AD conversion stop When there is an error in the internal parameters of MTCV, this flag will become 1. Cold junction measurement temperature abnormal - - - Unstable power supply Possible system error Broken couple error External wiring contact short circuit The output transistor is damaged The output transistor is aging or damaged, or the indicator is damaged The cable connection is poor, or the signal properties of the connection line are wrong, such as A0 and B0 are reversed Inconsistent setting of communication master-slave characteristics, such as baud rate, parity, data bits, address Please check the 3612, 3613 Check connection and troubleshoot Replace the module Connect the positive and negative signal lines correctly Set the communication parameters to be consistent The communication protocol of the master and slave is inconsistent, set the communication protocol to be consistent 1.Warranty scope refers to the programmable controller body. 3692 OFF(0) No error - The hardware is normal Data backup is normal The cold junction is normal - - - Broken even error status word(3613) Bit status Countermeasures Check the power status and eliminate Check the condition of the switch, wire or fuse and eliminate it 3660 System error status word(3612) Bit0:Error Possible Causes Loss of power supply or low voltage Power switch off or fuse blown Abnormal power wiring POWER LED flashes intermittently mode Bit status Phenomenon 3652 ON(1) OFF(0) No When the thermocouple of channel 1 ~ channel 16 is broken, the flag bit is 1 break fault 7. Common problems and solutions When the module does not work properly, please check in turn: (1) the connection of the power line and the condition of the relevant switches and protection appliances, so as to ensure the reliable power supply of the module; (2) whether the wiring of user terminals is firm; (3) check whether the 24Vdc power supply is overloaded. (4) check the application to ensure that the correct operation method and parameter range are selected in the application. Special attention should be paid to the BFM area with special operation timing. 2.The warranty period is 18 months, during the warranty period of normal use, the product failure or damage, our company free maintenance. 3.The warranty period starts from the date of production. The machine code is the only basis to judge the warranty period. The equipment without machine code shall be treated as overinsured. 4. Even within the warranty period, a certain maintenance fee will be charged if: (1)Failure to operate according to the user's manual; (2)Machine damage caused by fire, flood, abnormal voltage, etc. (3)Damage caused when a programmable controller is used for unusual functions. (4)Self-disassembly programmable controller 5. The service fee shall be calculated according to the actual cost. If there is another contract, the contract shall take precedence. 6.If you have any problem, you can contact the agent or contact us directly. SHENZHEN MEGMEET CONTROL TECHNOLOGY CO., LTD Add:5th Floor, Block B Unisplendour Information Harbor, Langshan Road, Shenzhen Tel:400-666-2-163 fax:(+86)0755-86600999 Postcode:518057 Web:www.megmeet-ia.com If you still cannot work after the above check, please refer to the following table. 5 ">

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Key features
- Thermocouple input
- RS485 communication
- Multi-segment control
- DIN slot and screw installation
- Switch output
- Internal and external cold end compensation
- Modular design
- MODBUS support
- Relay, Transistor, Voltage, Current output
- Up to 100 BFM units reading/writing
Frequently asked questions
The input voltage range is 20 to 30 Vdc, with a typical value of 24 Vdc, as per the manual.
The MTCV series supports K, J, E, N, T, R, S, and B type thermocouples, as indicated in the manual.
The MTCV series thermostat utilizes the Modbus RTU slave protocol for communication via RS485 interface.