Option - ModBus
The ModBus option module has been specifically designed for use with the DHC-100 Positioner via plug and socket installation. This module provides an isolated RS-485 bus connection using the ModBus protocol.
Resources
Data Sheet
Ideal Applications Include:
Specifications
Bus Connection:
Type: ANSI TIA/EIA RS-485 (electrically isolated up to 1500 Vrms)
Protocol: ModBus (selectable RTU or ASCII mode)
Logic "1": +VBA
Logic "0": -VBA
Selectable Address: 0-255 (1 to 247 usable)
Selectable line terminating resistor (RBA): 150 ohm
Line Polarization: Not required
Environmental:
Operating Temperature Range: 0C to 60C
Storage Temperature Range: -40C to 85C
Relative Humidity Range: 0 to 90% (noncondensing)
Cable Characteristic Impedance:
A value of 100 ohms or greater may be preferred, especially for 19.2K and higher baud rates
|
Transmitter Output:
Differential Output Voltage (VBA):
- 5V Max @ No load
- 1.5V min @ 54 ohm load
Output short circuit current:
- A to B: 95mA typical
- A or B to COM: 113mA typical
Transmitter Input:
Input Impedance (RBA): 96K ohms min (1/8 node)
Input Logic Threshold Voltage (VBA): 30mV min, 200 mV max
Input Hysteresis: 20mV Typical
|
