Modem for remote bidirectional communications and local programming of some controls (see specifications). It works with power 220 V, 50 hz; and it is supplied with a 9 VAC plug-in transformer. Communication speed up to 2400 Baud. It uses a standard RS232 modem cable with a DB25 connector. It has a separate modular telephone jack to connect a local telephone device; interface cable supplied. Dimensions 150 x 160mm x 45 mm. Contains indicators for: CD Detection Carrier (carrier), OH Offline. RX Receive Data. TX Transmit Data. DTR Terminal Data List.