Themis NanoPAK, Руководство пользователя

Страница: 127 / 156

A-11
Themis Computer
A—Connector Pinouts, Signals and Solder Beads
Solder Beads and Jumpers
Table A-5 below lists the solder beads, their descriptions and their default settings.
Table A-5. Solder Bead Settings
Name Category Description
Factory
Default
Setting
SB1 CPU-SET
This solder bead is not used as a solder bead. It is in fact two
contacts that should be momentarily shorted to clear the
CMOS powered by the battery. Except for special locked sit-
uation caused by heavy corruption of the CMOS content,
there should not be a reason to use it. Also, there is another
way to clear the CMOS by removing the battery from the bat-
tery holder on the Add-on card.
SB1 SHORTED: Clear the CMOS powered by the battery.
SB1: NEVER
INSTALLED
SB2,
SB3 OPTION-
SET
Used to set the serial link of the TTY-A port in half-duplex
mode or full-duplex mode. Half-duplex will only be used when
working in single pair mode in RS485 mode. Otherwise, the
full-duplex mode should be selected.
SB2,SB3 Set to 2-3: Full-duplex
SB2,SB3 Set to 1-2: Half-duplex
SB2, SB3:
Set to 2-3
(Full-duplex)
SB4 CPU-SET
This solder-bead is used to implement an approximate 6 sec.
delay in the turn-on time of the main 12V DC converter that
provides the main power to the NanoPAK. It allows the emu-
lation of a battery. This is only needed if there is no battery in
the system or the SBC module is not the Themis AMD SBC
module revX or revY.
SB4 NOT INSTALLED: 12V power is turned-on as soon as a
valid Vin input voltage is applied to the unit.
SB4 INSTALLED: 12V power is turned on 6 sec. after a valid
Vin input voltage is applied to the unit.
SB4:
NOT INSTALLED
(no 6s delay)
SB5 CPU-SET Not operational. Reserved for future use.
SB5:
NOT INSTALLED
SB6 CPU-SET
Used to set the FRU I
2
C address.
SB6 4-1 controls address bit 0 (ON means 0, OFF means 1)
SB6 4-2 controls address bit 1 (ON means 0, OFF means 1)
SB6 4-3 controls address bit 2 (ON means 0, OFF means 1)
NONE INSTALLED (sets the FRU I
2
C address = 0xAE/0xAF)
SB6:
NONE IN-
STALLED
SB7
OPTION-
SET
Used to select the protocol on the TTY-A port (RS232 versus
RS485/422).
SB7 NOT INSTALLED: RS422 or RS485 protocol
SB7 INSTALLED: RS232
SB7:
INSTALLED
(RS-232)
SB8
OPTION-
SET
Used to provide a termination on the receiver side. (Only ap-
plies when in RS422 or RS485 mode.)
SB8 NOT INSTALLED: No receiver termination.
SB8 INSTALLED: Receiver termination ON.
SB8:
NOT INSTALLED