Thermo Scientific Micro-Tech 9101 Reference Manual page 153

UART Configuration Jumpers
Jumper
J34
J35
J36
J39
J38
J40
J41
J42
J43
Thermo Fisher Scientific
Jumper Settings
COMM A, (UART 0)
Jumper Setting Description
Pins 1-2 RS-485 Normal Operation
Pins 2-3 RS-485 Multi-Drop Operation
COMM A, (UART 0)
Jumper Setting Description
Pins 1-2 RS-232 Mode
Pins 2-3 RS-485 Mode
Not Installed RS-232 Mode
COMM A, (UART 0)
Jumper Setting Description
RS-485 Receive  U0RXD
Pins 1-2
RS-485 Receive  U0CTS
Pins 2-3
COMM A Termination, (UART 0)
Jumper Setting Description
Pins 1-2 Enable RS-485 Termination
Pins 3-4 Disable RS-485 Termination
Not Installed Disable RS-485 Termination
COMM A Termination, (UART 0)
Jumper Setting Description
Pins1-2 Enable RS-485 Termination
COMM A Termination, (UART 0)
Jumper Setting Description
Pins1-2 1.2kΩ termination enable
Pins 2-3 600Ω Bias Enabled
Not Installed No additional termination
Default
J34 Installed 1-2
J35 Installed Pins 1-2
J36 Installed Pins 1-2
J39 Installed Pins 1-2
J38 Installed 1-2
J40 Installed 3-4
J41 Installed
J42 Installed 1-2
J43 Installed 1-2
Micro-Tech 9101/9201 Reference Manual, Rev J A-31