0049-0117-100 DSP9612 Flash Poll Modem – User Guide
10/12/2011
Rev. F1
Page 25 of 44
SW3-8
−
Carrier Control
SW3-8
ON = Constant
OFF = Switched
SW3-8 selects either constant or switched carrier. Constant carrier allows
DTEs, such as asynchronous dumb terminals or RTUs, to operate with
modems, without the input RTS signal. When constant carrier mode is
enabled (SW3-8 set to ON), the modem forces the transmit carrier active
and the RTS-CTS delay is minimum (<0.5 ms.).
You can use constant carrier in 4-wire, point-to-point or multi-point
applications (from master to slave modems).
In switched-carrier mode (SW3-8 set to OFF), the RTS/CTS delay is
active.
SW3-9
−
RX Termination
SW3-9
ON = Enable Rx Termination
OFF = Disable Rx Termination
SW3-9 selects whether RX termination is enabled for a modem. If you set
this switch ON, the receiver is terminated with 600
Ω
. If you set this switch
OFF, the receiver is not terminated.
SW3-10
−
Grounding Option
SW3-10
ON = Signal Ground and Earth Ground are
Connected
OFF = Signal Ground and Earth Ground are
Separated
Содержание DSP9612
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