Dependable Switching for Your Network Our relay-based fallback switches are built with the dependability you need. With automatic or manual failover to redundant circuits or equipment, you can quickly and easily switch your critical applications from a failing resource to a backup so you can keep your network up and running. Dataprobe switches always maintain connectivity, even when power is removed, so they never become a single point of failure.

Dataprobe switches have a MTBF of well over 100,000 hours, ensuring many years of protection. Flexible Switching Solutions From airports and national defense to first responder centers, our switches safeguard some of the world’s most critical networks. Our solutions are customizable and we’ll work with you to create a system reliability strategy for your specific application and needs. Switching Product Features • Single A/B switches to multi-circuit gang switches • Automatic fault detection and failover • Network management or operator remote control • Worldwide A/C and D/C installations • Support for multiple interfaces • Standard and OEM custom design solutions.

The need arose for a programmable control system that handles 8-bit data to have both RS-232 and RS-485 modes. This requirement was satisfied with a serial communication controller-transceiver, an octal buffer, and a two-line port (Rx and Tx for receiving and transmitting data), either in RS-232 or RS-485 mode. The RS-232 mode will program several parameters of the control system via a dedicated program in a PC. The RS-485 mode is used for serial communications to other similar systems and to a remote central station. Originally when the demand called for programming, P2 with lines Rx and Tx was connected to the PC's RS-232 serial port. In addition, the communication interface transceiver had to be configured for RS-232 mode. This was done by using four jumpers to manually connect the RS-232 transceiver points R1OUT, R1IN, T1OUT, and T1IN to the octal buffer, port P2, and the serial communication controller's output TXDA.

Shop Black Box for Datacom switches. Find devices for industrial, security, video, and power switching. Model 4123 Automatic Sensing A/B Network Switch with Remote. Model 4123 Auto Sensing A/B Switch with. Connected to ports A and B from one RS232 serial data. Download Film John Wick Subtitle Indonesia.

After programming, the four jumpers had to be removed to configure the system to the RS-485 mode by connecting the RS-485 transceiver points RO, DO/RI, DO/RI, and DI once again to the octal buffer, port P2, and the serial communication controller's output TXDA. To avoid that frustrating job of jumper move-remove, an automatic and reliable switch was used. As shown in, the MAX4533CPP, an electronic analog quad SPDT switch, can be used to simultaneously switch the octal buffer, port P2, and the Z8530H serial communication controller to RS-232 or RS-485 mode at any time.

The device is triggered by +5 V via a simple debounce RS flip-flop using an SPDT switch. How To Build A Value Driver Tree there. All digital inputs IN1-IN4 are parallel triggered, and therefore all 'contacts' are set to the CLOSE or OPEN position. Thus, selecting RS-232 or RS-485 mode is easily accomplished. The switch operates from a single supply of +12 V dc, and digital-input thresholds ensure TTL-compatibility for the connected devices. ON resistance is 175 (omega) maximum. However, this doesn't harm the data signals, which stay at +2.4 V dc. The +12-V dc supply is available from the system's board, and +5 V is derived from the zener diode and R1.

C1 and C2 are used to decouple the +12-V and +5-V supply lines.