Com1 Serial Port Connections - Mettler Toledo IND131 Guide D'installation

2.4.2.3.4. Original J-Box only
Reinstall the IND131 terminal by sliding it back down onto the DIN rail making sure that the wiring
from the load cells is not pinched. Reconnect the load cell harness from the summing board to the
load cell connector on the front of the terminal.
2.4.3.

COM1 Serial Port Connections

The COM1 serial port includes connections for RS-232 and a +5 VDC supply source. Table 2-7
indicates which terminal is which signal on the COM1 port.
2-26 METTLER TOLEDO IND131/IND131x/IND331/IND331xx Installation Manual
Wire tie anchor
for Summing
Board cable
Figure 2-40: Load Cell Wires Installed and Routed, Summing Board Mounted
The maximum current draw from the +5V supply on COM1 is 100mA.
Table 2-7: COM1 Connections
Terminal Signal
TxD Transmit RS-232
RxD Receive RS-232
Gnd Logic Ground
+5V + 5 Volts DC
Notes
100mA Maximum
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