Asynchronous Multipoint Short Range Modems

RAD's miniature SRM-5AC and SRM-6AC are short range modems connecting full or half duplex asynchronous terminals to computers. Featuring carrier control, the modems can be used in multipoint applications and where end-to-end transfer of a control signal is required.

• Equipped with an internal filter that overcomes both radiated and conducted interference, making the unit ideal for noisy environments such as industrial locations

The miniature SRM-5AC and SRM-6AC are short range modems connecting full or half duplex asynchronous terminals to computers. Featuring carrier control, the modems can be used in multipoint applications and where end-to-end transfer of a control signal is required. They operate at data rates up to 19.2 kbps with a range of up to 3.5 km (2.2 miles) over 24 AWG. The SRM-5AC is a compatible sub-miniature model of the SRM-6AC, offering the same features in half the size.

 

The carrier can be strapped to be constantly ON, or controlled by the Request to Send signal. A switch-selectable DTE/DCE option allows the modems to operate as a DTE for connection to another DCE, without requiring a cross cable.

 

The modems are available with an internal filter (optional for the SRM-6AC). The filter is designed to overcome radiated and conducted interference for high noise immunity.

 

Connection to the line is usually via a 5-screw (4-wire and ground) terminal block. Optional connectors available for the SRM-6AC are RJ-12 and RJ-45. The SRM-5AC has both terminal block and RJ-12 or RJ-45 as its line connectors.

The carrier can be strapped to be constantly ON, or controlled by the Request to Send signal. A switch-selectable DTE/DCE option allows the modems to operate as a DTE for connection to another DCE, without requiring a cross cable. The modems are available with an internal filter (optional for the SRM-6AC). The filter is designed to overcome radiated and conducted interference for high noise immunity. Connection to the line is usually via a 5-screw (4-wire and ground) terminal block. Optional connectors available for the SRM-6AC are RJ-12 and RJ-45. The SRM-5AC has both terminal block and RJ-12 or RJ-45 as its line connectors.