Mettler Toledo IND246 Installationshandbuch Seite 37

COM2 Connections
The COM2 option board (Figure 2-22) is positioned in option position 1 on the
Main board. This option board provides a single serial port labeled COM2.
Figure 2-22: COM2 Option Board
The COM2 port provides RS-232 and RS-485 connections. There is a setup
parameter that must be selected to match the hardware connection used. This
parameter controls how the transmit and receive lines are controlled. See Figure
2-18 and Figure 2-24 for connection details.
Figure 2-23: COM2 Port Signals
Figure 2-24: Sample COM2 Connections
IND246 Terminal Installation Manual
Terminal Signal
TxD Transmit RS-232
RxD Receive RS-232
Gnd Logic Ground
RS-485 A RS-485 data A
RS-485-B RS-485 data B
NOTES
1. USE ONLY SHIELDED CABLE
2. MAXIMUM CABLE LENGTH: 50 FEET (15
METERS)
3. WIRE SIZE: 18 AWG (0.832 mm
24 AWG (0.205 mm
NOTES
1. USE ONLY SHIELDED CABLE
2. MAXIMUM CABLE LENGTH: 1000 FEET (304
METERS)
3. WIRE SIZE: 18 AWG (0.832 mm
24 AWG (0.205 mm
2
) MAXIMUM
2
) MINIMUM
2
) MAXIMUM
2
) MINIMUM
2-15