Black Box MD1970A, Руководство пользователя

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Installing the Modem
For 4-wire, full-duplex communications, keep the jumper set to the default position of Disabled.
Jumper S5
−
Transmit Carrier
Settings: Control ( default )
Constant
Jumper S5 places the transmitter under terminal control (default) or turns on the transmitter continuously in a 2-wire
half duplex system.
Jumper S6
−
Local Copy
Settings: Enabled
Disabled (
default )
Jumper S6 must be left is the default position of Disabled when operating on a 4-wire network. It is also normally
left in the default Disabled position when operating on a 2-wire network. Strapping this jumper as Disabled inhibits
the local receiver from receiving the transmission of the local transmitter.
Jumper S8
−
Signal and Earth Ground
Settings: Connected
Separate (
default )
Jumper S8 allows Earth GND to be tied to the modem system GND.
Jumper S9
−
RTS-CTS Delay
Settings:
8 ms ( default )
33 ms
59 ms
219 ms
Jumper S9 configures the modem’s RTS-CTS delay. Four choices for selecting an RTS-CTS delay are available.
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