Quatech MPA-100 Manual de usuario descargar pdf (Pagina 30)

D4 -REMOTE LOOPBACK ENABLE:

When set (logic 1), this bit allows the DTE to test the transmission path up to and through

the remote DCE to the DTE interface and the similar return transmission path. When cleared

(logic 0), no testing occurs. If jumper J7 is in place the Remote Loopback is also used to control

the Sync input of the Channel A data receiver. This is useful in situations where it is desired to

receive unformatted serial data.

D3 -RECEIVE CLOCK ENABLE (DCE only):

When set (logic 1), this bit allows the DCE to transmit its Receive Clock (RCLK). When

cleared (logic 0), the DCE receives RCLK. Since a DTE can only receive RCLK, writing to this

bit has no effect on a DTE.

D2 -TRANSMIT CLOCK ENABLE (DTE only):

When set (logic 1), this bit allows the DTE to transmit its Transmit Clock (TCLK). When

cleared (logic 0), the DTE receives TCLK. Since a DCE can only transmit its TCLK, writing to

this bit has no effect on a DCE.

D1 RESERVED:

This bit should always be programmed to 0.

D0 RESERVED:

This bit should always be programmed to 0.

MPA-100 User's Manual 9-2

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Quatech MPA-100 Manual de usuario Pagina 30