6 External Connections
The
The available input signals for AUXIN are Clear To Send (CTS) and the Receive Clock (RCLK). The available output signals for AUXOUT are Request To Send (RTS), the Transmit Clock (TCLK), and the AUXIN signal (for loopback). Either
Configuration is usually done using Soft Select, accessable through Device Manager in Windows operating systems. Hardware overrides are available via jumper J1 for interface signal routing.
6.1 DTR/DSR or RTS/CTS Operation
The DTR or RTS modem control output of the UART can be used to enable and disable the transmit drivers. These options are selectable per channel. The factory default, with no jumpers across any of the pins in J1, is for both the drivers and receivers of both channels to be continuously enabled. . These option are not selectable via jumpers, they are only accessable through Device Manager under Window operating systems.
6.2 RTS/CTS Handshake
Transmission of RTS, combined with reception of CTS, allows for hardware handshaking (data flow control) between the UART and the external device. RTS is transmitted on AUXOUT and CTS is received on AUXIN by connecting a jumper across the “AUX” pins for the appropriate port of the jumper block J1. If RTS/CTS handshaking is not desired, the RTS output can be looped back to the CTS input by removing the any jumper from “AUX” pins for the appropriate port of the jumper block J1.
6.3 RCLK
This is the clock signal used by the receiver portion of the UART. It is generally provided by connecting it to the UART's own transmit clock output (TCLK). This signal can only be accessed via Soft Select through Device Manager. RCLK is affected by the “Loopback All”, “Modem Control”, or “Clocks” selections under
6.4 TCLK
This is the output clock signal used by the transmitter portion of the UART. It is generally connected to the UART's own receive clock input (RCLK). This signal can only be accessed via Soft Select through Device Manager. TCLK is affected by the “Loopback All”, “Modem
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