Mtl 5051 Communication Isolation Barrier Rs232 Rs422

US $440

Pearland, Texas, United States
Jun 23rd

Open on mobile:
QR code

The MTL5051 provides bi-directional serial data communication from a computer system in safe area to instrumentation in a hazardous area. It is used to provide a fully floating dc supply for, and serial data communications to: MTL643, MTL644, MTL646 and MTL647 IS text displays, other IS instrumentation, keyboards or a mouse. It can also be used for data communications across a hazardous area. SPECIFICATION See also common specification Location of field equipment Zone 0, IIC, T4-6 hazardous area Div 1, Group A hazardous location Safe-area signal RS232 or RS422 Hazardous-area signal MTL640 Series mode: To hazardous area: 3V signal superimposed on 12V (nominal) supply 5mA signal superimposed on quiescent current Across hazardous area communications mode: To hazardous area: 10mA current source From hazardous area: 10mA current source IS RS232/TTL devices mode: To hazardous area: RS232-compatible From hazardous area: TTL/RS232 signals MTL5051 Terminals MTL640 mode Comms mode Other IS devices 1 2 3 4 5 6 Common V signal I return - - - Common - Rx Tx - - Common 5V/12V - - Tx Rx Switch 1a 1b ON ON OFF ON OFF OFF/ON LED Indicators Green: power indication Max. power dissipation within unit 1.7W at 24V, 25mA load Maximum power consumption (25mA load) At Vs=20V, 105mA At Vs=24V, 90mA At Vs=35V, 70mA Comms bandwidth 643/4 mode 1200 to 9600 baud Other modes up to 19.2 kbaud signal levels Safety description Terminals 1,2,3,4 only Terminals 1,3,4 only Terminals 1,2,3 only Terminals 1,5,6 only Terminals 1,2,5,6 only Terminals 1,2,3,4,5,6 only 14V, 800mW, 14V, 350mW, 14V, 450mW, 15V, 70mW, 20V, 460mW, 20V, 810mW, 192mA 88mA 108mA 35mA 139mA 227mA Terminals RS232 mode TTL mode RS422 mode 7 8 9 10 11 12 13 14 - - - Tx Common Rx Supply – ve Supply +ve - - Tx - Common Rx Supply – ve Supply +ve Rx – Rx + Tx + Tx – Common - Supply –ve Supply +ve Switch 2a 2b OFF ON ON OFF ON OFF Hazardous area supply terminal 2 +12V mode +12V mode +5V Hazardous Interfacing 12.0V ± 5% (load <23mA) 8.0V min (load >23 to <50mA) 5.6V ± 5% (load >23 to <50mA) See MTL640 Series for details of interfacing with MTL643, MTL644, MTL646 and MTL647 IS text displays. Across hazardous areas communications mode The MTL5051 is used in pairs to transfer bi-directional full- duplex data across hazardous areas, as shown above. Current switching is used to minimise the bandwidth-limiting effects of long cables. Interfacing to an IS keyboard, mouse or other device Communicating with RS232-level interfaces, such as an IS keyboard, mouse, etc. is achieved by using one or more MTL5051 units as required by the device. (TTL level interfaces are also accommodated by the TTL-compatibility feature of RS232 receivers.) The supply to the IS equipment may be selected to be either 5V or 12V by switch on top of unit.