Hardware Jumper Summary
VL-586-1 Reference Manual
Configuration
–
19
Table 1: Jumper Summary
Jumper
Block
Description
As
Shipped
Page
V1[1-2]
RS-232 Signal Enable
In
— RS-232 mode. Enables the RS-232 line drivers and receivers.
Out
— RS-422/485 mode. Disables the RS-232 line drivers and receivers.
In
28
V1[3-4]
RS-422/485 Ground Circuit
In
— RS-422/485 mode. Connects ground to J1 pin 6A.
Out
— RS-232 mode. Frees J1 pin 6A for CTS2 (COM2).
Out
28
V1[5-6]
RS-232/422/485 Mode Selector
In
— RS-422/485 mode.
Out
— RS-232 mode.
Out
28
V1[7-8]
RS-422/485 Differential Line Driver Control
In
— RS-485 mode. Enables software control of the differential line driver.
Out
— RS-422 mode. Permanently enables the differential line driver.
Out
28
V1[9-10]
RS-422/485 Transmission Line Termination
In
— Terminates data circuit with 100
Ω
resistor
(RS-422, or RS-485 endpoint stations only)
Out
— Leaves data circuit unterminated
(RS-485 intermediate multidrop stations only)
Out
28
V2
Counter/Timer 5 Clock Source
250 kHz
1 MHz
CTC#4
External Input
1 MHz
—
V3
Counter/Timer 4 Clock Source
250 kHz
1 MHz
External Input
1 MHz
—
V4[1-2]
CMOS Battery Test Terminals
Note!
V4 is not a jumper. It is used as a test point to measure the current flowing in the
CMOS battery circuit. Do not place a jumper on these pins.
Out
—
V5[1-2]
Battery Backed SRAM Power
Note!
V5 is for factory use only.
In
— Power applied to Battery Backed SRAM
Out
— Power removed from Battery Backed SRAM
Varies
—
V6[1-2]
CMOS RAM Erase
In
— Erases CMOS RAM and Real Time Clock contents
Out
— Normal operation (V6[2-3] must be in)
Out
23
V6[2-3]
CMOS RAM Power
In
— Connects power to CMOS RAM and Real Time Clock circuits
Out
— Power disconnected
In
23
V7[1-2]
CPU Cache Mode
Note!
V7 is for factory use only.
In
— Write through mode
Out
— Write back mode
Out
—
V8[1-2]
CPU External Clock and PCI Bus Speed
Note!
V8 is for factory use only.
In
— 25 MHz
Out
— 33 MHz
Out
—
V9[1-2]
CPU Internal Clock Speed (AMD Only)
Note!
V9 is for factory use only.
In
— 133 MHz
Out
— 100 MHz
In
—
Содержание VL-586-1
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