Mettler Toledo IND231 Manuel D'installation page 34

2.4.8.2. USB Device Option
This option board provides a single Mini-USB type B connector port, shown in Figure 2-39. The
Mini-USB port is a device type interface (not a host), and operates basically as a serial port. An
external mating type B Mini-USB cable is required when connecting to this port.
The port is equipped with a cap which screws on when the port is not in use.
2-20 METTLER TOLEDO IND231/IND236 Installation Manual
Table 2-6: Isolated Serial Port Pin Assignments
Terminal Signals
Pin 1 TX/RX+
Pin 2 TX/RX-
Pin 3 RX+
Pin 4 RX-
Pin 5 GND
Pin 6 GND
Pin 7 RX
Pin 8 TX
Socket for USB
connector
(Figure 2-39)
Figure 2-38: USB Option Board
Figure 2-39: Mini USB Socket and Cap
Description
RS-485 data A or RS-422 Transmit data A
RS-485 data B or RS-422 Transmit data B
RS-422 Receive data A
RS-422 Receive data B
Logic Ground for RS-422/485
Logic Ground for RS-232
RS-232 Receive
RS-232 Transmit
Connector to
Main board
30094756 | 04 | 02/2021