The four channel analogue transmitter is part of a family of explosion protected DIN rail mounting modules that transmit to and receive from an Austdac SILBUS field bus network. The SILBUS-TX4A(G) can transmit up to four 4-20mA or 0.4-2.0V analogue signals on four independent valid SILBUS channels. The SILBUS-TX4AG variant has been re-scaled to accept 0.44-2.2V input signals only. See section 8 for more details on the SILBUS-TX4AG.