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The twisted pair design allows RS-485 to achieve better noise immunity, making it suitable for environments with electrical interference. The cables also have a balanced line configuration, which helps to further enhance noise rejection and signal integrity. If your computer does not have an RS-232 serial port, low cost USB-to-RS-232 serial cables are available; contact Mosaic Industries for details. In that case, when using very long cables you can improve noise immunity and assure a valid idle level when the transceiver is not active by installing bias resistors. In this case, cable connections may be made to Serial 1 at pins 5 and 6 of the PDQ Board’s 10-pin Serial Header , or pins 5 and 6 of the Docking Panel’s 10-pin right-angle Serial Header. By default, the RS485 connections are not brought out to the Docking Panel’s DB-9 Serial1 Connector, although custom placement of zero-ohm surface-mount resistors on the Docking Panel can route the RS485 signals to the DB-9. The advantage of using Serial1 for RS485 is that the Serial1 RS485 signals are also available on the Docking Panel, while the Serial2 RS485 signals are available only on the PDQ Board’s Serial Communications Header. The terminal program communicates with the PDQ Board via this serial port.

The USE.SERIAL2 command means that the operating system’s terminal interface now communicates via Serial2. The default baud rate for both Serial1 and Serial2 is 115200 baud after a factory cleanup. 1 running at the prior established baud rate (typically 115200 baud). If it doesn’t, confirm that the terminal’s baud rate is correct by selecting the Comm item in the Settings menu of the Mosaic Terminal program, and click on 115200 baud. Once the project is open, click Build→ Build, and after the compilation is done, enter the Mosaic Terminal by clicking Tools→ Mosaic Terminal and use the Send File menu item to send GETSTART.DLF to the PDQ Board. The PDQ Board's two serial ports support limited use of generating a parity bit. On the other hand, the secondary serial port (Serial2) is implemented using hardware pins PA3 (input) and PA4 (output), and is controlled by the associated interrupts IC4/OC5 and OC4, respectively.

The QScreen Controller, however, does not implement hardware handshaking. If upgrading a Wiegand system to OSDP, it is possible to use the existing wiring, however, using simple stranded cable typical of Wiegand access control readers does not typically meet the TIA485/EIA-RS485 specification for twisted pair recommendations.1 If your building has both styles of access control systems, Remee provides a specific cable design (PN 725930) that allows you to migrate slowly from Wiegand to OSDP with a single cable pull. This whole system allows manufacturing facilities to control their devices remotely and also set-up automation. Allows controlling up to 253 ST / RSBL series serial bus servos at the same time. To ensure that no two devices drive the network at the same time, rs485 cable it is necessary that each slave device be able to disable it’s own RS-485 data transmitter. RS485 uses the same differential signaling scheme as RS422, and hence has the same superior signal-to-noise characteristics and range described above. Amongst the wide range of products for sale choice, Rs485 Cable is one of the hot items. This provides a wide range of interface possibilities. A jumper labeled "1 485En" (J4) enables RS485 operation on the Serial1 port if the jumper cap is installed, and configures Serial1 for RS232 operation if the jumper cap is not installed.

To do that, install a jumper cap at "Term" only. A jumper labeled "2 485En" (J7) enables RS485 operation on the Serial2 port if the jumper cap is installed, and configures Serial2 for RS232 operation if the jumper cap is not installed. In that case, do not install jumper caps at the jumpers labeled "Term" or "RTerm". In this case, cable connections may be made to Serial 2 on either the 10-pin PDQ Board Serial Communications Header, or the Docking Panel’s 10-pin right-angle Serial Header, or the Docking Panel’s Serial2 DB-9 Connector. By default, the RS485 connections are not brought out to the Docking Panel’s DB-9 Serial1 Connector. Contact Mosaic if you require RS485 signals to be routed to the DB-9 Connector. In this case, cable connections may be made to Serial 1 on either the 10-pin PDQ Board Serial Communications Header, or the Docking Panel’s 10-pin right-angle Serial Header, or the Docking Panel’s Serial1 DB-9 Connector. In this case, cable connections may be made to Serial 2 at pins 4 and 10 of the PDQ Board’s 10-pin Serial Header, or pins 5 and 6 of the Docking Panel’s 10-pin right-angle Serial Header. Because all of the serial I/O routines on the PDQ Board are revectorable, it is very easy to change the serial port in use without modifying any high level code.