The AD-AAB 20 GX provides 2-channel output of analog signals. The device communication is realized using the MODBUS RTU protocol. The analog setpoints can be set via implemented MODBUS commands.
The power supply and the RS485 bus connection are possible via the rear DIN rail connector. The device is equipped with two rotary coding switches with which the bus address can be set on the device.
The operating voltage is indicated by a green LED. The data communication is signaled with a yellow LED. An optical search function allows the localization of a single device in a network. For this purpose, the green LED is set in a time-limited flashing mode, between 1 and 255 seconds.
As well as interface settings as well as the device address can be modified during operation by means of Modbus commands. All Modbus register addresses and associated commands are listed in the document attachment.



Specification of analog process signals for control purposes.

Specific characteristics

  • Two analogue outputs can be used as voltage or current input
  • Galvanically isolated RS485 bus interface
  • Parameterizable interface settings
  • Hardware switch for device address
  • Galvanically isolated switching power supply
  • Can be parameterized with PC via AD Studio configuration software
  • Status LED for operating voltage and data communication
  • Optical search function
  • Modbus master mode

Business data

Order number
Rail connector
Artnr: AD-GX-Connector
Zur Durchschleifung von Versorgungsspannung und RS485-Bus
Aufrastbar auf Tragschiene
(DIN EN 50022).
Customs tariff number / country of origin 8543 70 90 / Deutschland


Data sheet pdf en-aab20gx.pdf (214 kB)
Tender text zip (10 kB)
STEP file step gx.step (3 MB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

Technical specifications

Current outputs
Range 0 ... 20 mA
Output load Max. 450 Ohm
Voltage outputs
Range 0 ... 10 V
Output load Min. 10 kOhm
Signal output
Channel counts (U/I) 2
Basic accuracy < +/- 0,3 %
Temperature influence 80 ppm/K
Resolution 12 bit
Transmission behaviour
Response time Max. 15 ms
Software protocol Modbus-RTU
Data format 19200, e, 8, 1
Max. bus users 99
Bus termination 120 ohms both sides at the end
Max. length of bus 500 m (no spur lines)
Cable Twisted and shielded
Supply voltage 18 ... 30 V DC
Max. power consumption 1400 mW (24V DC)
Dimensions (WxHxD) 6,2 x 92 x 101 mm³
Manner of fastening DIN rail mounting 35mm, EN 50022
Type of protection IP 20
Connection method Screw clamp
Bolting torque terminals 0,5 Nm
Wire cross section Max. 2,5 mm2
Weight ~ 70 g
Environmental conditions
Permissible ambient temperature -10 ... +50 °C
Storage and transport -10 ... +70 °C (no condensation)
Product family standard 1) EN 61326-1
Emission 2) EN 55011, CISPR11 Cl. A, Gr. 1
1) During checking, slight signal deviations are possible.
2) Warning:
This device is not intended to be used in residential areas and can not ensure adequate protection of radio reception in such environments.
Electrical safety requirements
Product family standard EN 61010-1
Galvanic isolation, test voltages
RS485 bus / power supply 1,5 kV, 50 Hz (1 min)
Analog output / power supply 1.5 kV, 50 Hz (1 min)
Analog output / RS485 bus 1,5 kV, 50 Hz (1 min)
Analog outputs between themselves 0,5 kV, 50 Hz (1 min)
Protection circuits
Power supply Electrical surge and reverse current protection

Block and wiring diagram




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