Product Description ADS-DM218 multi-channel digital transmitter analog signal acquisition module, and its signal acquisition module is an 8-channel non isolated universal input module. ADS-DM218A is an 8-channel non isolated potentiometer input module. The sampling rates of the ADS-DM218 module are 1 second (50/60Hz), 90 milliseconds (50Hz), and 75 milliseconds (60Hz), all of which can be set, with a measurement accuracy of 0.2 level. The sampling rate of the ADS-DM218A module is only 1 second (50/60Hz), and the measurement accuracy is also 0.2 level. In addition, the device also has an isolated RS485 interface and Modbus RTU protocol. The power supply range is 10VDC to 32VDC, and the power consumption is less than 1.2W. Basic Specifications Power supply voltage: 10~32VDC Power consumption: less than 1.2W Environmental temperature: -10~55 ℃ (storage: -25~65 ℃) Environmental humidity: 35~85% RH, no condensation Absolute humidity: MAX. W. C 29.3 g/m3 dry air at 101.3kPa Installation location: indoor, height<2000m Insulation resistance: ≥ 100M Ω (500V DC MEGA reference) Insulation strength: 1000V AC (test conditions: 50/60Hz, 1 minute) Anti interference: IEC61000-4-2 (electrostatic discharge), Class III IEC61000-4-4 (Electrical Fast Transient Pulse Group), Class III IEC61000-4-5 (surge), Class III ■ Input specifications Measurement input: All channels are universal inputs, and the input signal is set by parameters. Please refer to [Input Signal] for input signal description, Number of input channels: 8 channels, enabled by parameter settings. Isolation: No isolation between channels, not suitable for application sites with common mode voltage between channels. Set as a voltage input channel, when the input signal is too large and exceeds approximately 5.5V DC, the input channel enters a protected state and will affect all measurement channels, but will not damage the module input circuit. After the voltage signal returns to normal, the module also returns to its normal measurement state. Input is isolated from communication and module power supply. Measurement cycle: can be set through parameters, with a factory default setting of 1 second (8 channels) The measurement speed is also influenced by the input signal selection parameters of each channel and the digital filtering time constant. Basic error: ± 0.2% F • S When the input signal is selected as a B-type thermocouple, accuracy is not guaranteed when it is less than 400 ℃. Cold junction compensation accuracy: it is related to the cold junction compensation mode, the Thermal equilibrium at the terminal and the cold junction compensation coefficient. Communication specifications Communication interface: RS485 Isolation: isolated from input channels and module power supply Communication protocol: Modbus RTU protocol (slave mode) Module address: 1-255 optional Baud: 2400 ／ 4800 ／ 9600 ／ 19200 ／ 38400 bps ／ 57600 bps ／ 115200 bps ／ 230400 bps Response time: 500 μ S (measured value) Data format: 1-bit start bit, 8-bit data bit, 1-bit Parity bit, 1-bit or 2-bit stop bit optional Parity check: optional Check digit (odd check/even check/no check) Synchronization method: Start stop synchronization method Transmission mode: bidirectional half duplex multipoint connection Communication distance: ≤ 1.2km, requiring the use of compliant cables and matching resistors, preferably twisted pair cables Code Description | content | Code Description | | ADS-DM218 | 8-channel non isolated universal input with 0.2 level accuracy; | | ADS-DM218A | 8-channel non isolated Potentiometer input, 0.2 class precision; |
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