Black Box MD1640A, MD1641A manual 133

CHAPTER 9: DIP-Switch Settings

applications, especially asynchronous, this switch should be set so that RTS is forced On (DIP-Switch #7 DOWN)

RTS functions Normally	=	Switch #7 UP
RTS forced On	=	Switch #7 DOWN
Factory Default Setting	=	DOWN

Switch #8

Enable/Disable Command Mode -- "Com"

(Asynchronous/Synchronous Mode/Leased/Dial-Up)

In some applications you may want to disable the Series II Modem's Command mode so that the modem does not recognize or react to AT or V.25bis commands. This may be true in strictly auto-answer applications where no call origination is required. Place DIP-Switch #8 in the DOWN position to enable Command mode. Place DIP-Switch #8 in the UP position to disable Command mode. The factory default setting is Command mode enabled.

Disable Command Mode	=	Switch #8 UP
Enable Command Mode	=	Switch #8 DOWN
Factory Default Setting	=	DOWN

Switch #9

Digital Loopback Test

(Asynchronous/Synchronous Mode/Leased Line/Dial-Up)

When in Synchronous mode, this switch controls both Local Digital Loop and Remote Digital Loop tests while on-line. When the Voice/Data switch is toggled to the Answer mode position (UP) and DIP-Switch #9 is in the UP position, the Series II Modem performs the Local Digital Loopback test. When DIP-Switch #9 is DOWN and the Voice/Data switch is toggled to Answer mode position (UP), the Series II Modem performs the Remote Digital Loopback test.

Local Digital Loopback Test	=	Switch #9 UP
Remote Digital Loopback Test	=	Switch #9 DOWN
Factory Default Setting	=	DOWN

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