Hart Usb Rs232 Modem Connect Pc With Hart Instruments
- : Microcyber
- : Liaoning, China
- : In Stock
- : 500 Sets/Month
In the instruments industry, the traditional 4 – 20 mA analog transmitters are upgrading to the fieldbus with digital communication. HART fieldbus communication has digital communication capability with compatible analog signal. HART MODEM is a necessary and convenient tool for the analog products upgrading and signal exchanging in the control plant.
1. Complete HART interface, conform to HART physical layer standard
2. Transformer isolation, no ground connection influence
3. Low power consumption, no need of external power source
4. USB or Serial port
Microcyber HART MODEM
The numerical transmission and control signals of industrial automation instruments are being upgraded from traditional 4-20mA analog signal to industrial fieldbus with digital communication functions. HART fieldbus has the function of digital communication and it is compatible with 4~20mA analog signal, which is widely used now.
Microcyber HART Modem provides two kinds of PC interface. HM105-RS232 is a converter between HART bus signal and RS-232 serial signal. HM105-USB is a converter between HART bus signal and USB virtual serial signal.
HM105 HART Modem
Features
Voltage-mode modem signal
Compliance with HART (FSK) Physical Layer Specification
Transformer isolation to avoid grounding effect
Low power design without external power supply
Two Choices with USB Port and Serial Port
USB HART signal modem can supply external power
The output amplitude of RS232A HART signal modem is adjustable
Dimension
Dimension（70*50*18，unit mm）
The HM105 is a signal converter between the HART-protocol field device and the PC running the configuration software. See below for details.
HM105-USB（OFF）or HM105-RS232 Wiring diagram
When connecting multiple HART devices, the above figure is based. Connect the remaining HART devices to the HART devices in the figure. Note that the power supply needs to support multiple devices. The load resistors are connected in series between the power supply and the device.
This product is a voltage-modulated HART signal modem. The two non-polar alligator clips on the HART interface are clamped to the HART load resistors at both ends of the HART load resistor or at both ends of the field device power supply. Connect the other end of the product to the USB port of the PC (when the HM105-RS232 modem is used, the 9-pin serial port) to connect to the PC.
HM105-USB（ON）Wiring diagram
When using HM105-USB modem, the PC needs to install the included USB to serial port driver. The running configuration software uses the virtual serial port provided by the driver. When using HM105-RS232 modem, the configuration software uses the serial port provided by the host. 1200 bps half-duplex asynchronous serial communication via modem and field devices.
The HM105-USB uses a FTDI chip to provide a virtual COM port (VCP) that supports Windows, Linux, Mac OS, Windows CE and other operating systems.
Technical Specifications
HM105-USB type performance index
Ambient Temperature | -20℃ ～ 50℃ |
Isolation Voltage | 1000VAC |
Receiving Impedance | ≥ 5 KΩ |
Receiving Sensitivity | 120 mVpp |
Output Amplitude | 500 mVpp (@ 500 Ω) |
24V Output | < 40 mA |
HM105-RS232 type performance index
Ambient Temperature | -20℃ ～ 50℃ |
Isolation Voltage | 1000 VAC |
Receiving Impedance | ≥ 5 KΩ |
Receiving Sensitivity | 120 mVpp |
Output Amplitude | 60 mVpp ～ 330 mVpp (@ 250 Ω) |
Selection Code Table
NCS-HM105 | HART signal modem | |||
Code | Description | |||
RS232A | RS232 Interface - adjustable amplitude | |||
RS232B | RS232 Interface - amplitude is not adjustable | |||
USB | USB Interface | |||
NCS-HM105 - RS232A —— Selection example | ||||
