SERVSWITCH™
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“Serial 2-button mouse” refers to those mice that have serial RS-232 interfaces
(usually with a DB9 connector), are Microsoft compatible, and use a 3-byte, 7-bit,
1200-bps, no-parity data format. Most PC serial mice with two buttons fall into this
category.
“Serial 3-button mouse” refers to those mice which have serial RS-232 interfaces
(usually with a DB9 connector), are Mouse Systems compatible, and use a 5-byte,
8-bit, 1200-bps, no-parity data format. Most PC serial mice with 3 buttons fall into
this category.
Certain commonly available serial mice made in Asia have the usual three
buttons and a switch on the bottom. This switch is usually labeled “MS/PC”; when
it is in the “MS” position, the mouse is compatible with the “serial 2-button” setting,
and when it is in the “PC” position, the mouse is compatible with the “serial
3-button” setting.
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