Chapter 4: 27
Boot Mode pins (28, 15) so that when the TTL DTR goes low, the reset
input goes low briefly, and the Boot Mode pin is held low. This puts the
microcontroller into boot mode so that the SBC can then make it jump to
the Firmware, or update the Firmware in the microcontroller.
Page 3: The TX1, RX1 and DTR1 lines go to the Connectorboard and then to
Module 1 via J5 pins 9, 10 and 11. The TX2, RX2 and DTR2 lines go to the
Connectorboard and then to Module 2 via J5 pins 12, 13 and 14.
4.4.3.2 Connectorboard schematic (061-x172-0x)
Page 3: The TX1, RX1 and DTR1 lines arrive on J5 pins 9, 10 and 11, and are then
send to Module 1 via J3 pins 5, 12 and 6. The TX2, RX2 and DTR2 lines
arrive on J5 pins 12, 13 and 14, and are then send to Module 2 via J4 pins
5, 12 and 6.
4.4.3.3 Chamberboard schematic (061-x178-0x)
Page 1: The TX, RX and DTR lines arrive at J2 pins 5, 12 and 6, and are renamed
SEROUT, SERIN and DTR. All three lines then go to the RS232 transceiver
U19. The TTL SOUT and SIN lines on the transceiver connect directly to
the microcontroller U1-A. The TTL DTR line goes to the Boot circuit com-
posed of R4, R5, R6, R7 and C3. The boot circuit then drives the U1-A re-
set input and Boot Mode pins (28, 15) so that when the TTL DTR goes low,
the reset input goes low briefly, and the Boot Mode pin is held low. This
puts the microcontroller into boot mode so that the SBC can then make it
jump to the Firmware, or update the Firmware in the microcontroller.
4.4.3.4 Probeboard schematic (061-0177-0x)
Page 1: The TX, RX, and DTR lines arrive at J2 pins 5, 12, and 6 and are renamed
SEROUT, SERIN, and DTR. All three lines then go to the RS232 transceiver
U19. The TTL SOUT and SIN lines on the transceiver connect directly to
the microcontroller U1-A. The TTL DTR line goes to the Boot circuit com-
posed of R4, R5, R6, R7, and C3. The boot circuit then drives the U1-A re-
set input and Boot Mode pins(28, 15) so that when the TTL DTR goes low,
the reset input goes low briefly, and the Boot Mode pin is held low. This
puts the microcontroller into boot mode so that the SBC can then make it
jump to the Firmware, or update the Firmware in the microcontroller.
4.4.4 Power Supply and Voltage Regulators
4.4.4.1. Daughterboard schematic (061-0171-0x)
Page 5: The offline power supply provides +15V and -15V on J7 pins 4 and 1. It
also provides +5V on pins 6 and 7. +5V on J7 pin 6 is separately fused
by F1 and then sent to the SBC via J8 pin 4. +5V on J7 pin 7 is separately
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