Mettler Toledo IND246 Installationshandbuch Seite 39

2.4.3.4. COM1 Serial Port (POWERCELL)
The COM1 port for the IND246 POWERCELL version includes connections for RS-232, RS-422 and
RS-485. 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.
Figure 2-23 indicates which terminal carries which signal on the COM1 port. Make the connections
as necessary.
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An example of connecting via RS-232 to external equipment is shown in Figure 2-24. Make the
Terminal
METTLER TOLEDO IND246 and IND246 POWERCELL Installation Manual
connections as necessary.w
NOTES:
1. USE ONLY SHIELDED CABLE.
2. MAXIMUM CABLE LENGTH: 50 FEET (15 METERS).
3. WIRE SIZE: 18 AWG (.823 mm
24 AWG (0.205 mm
Figure 2-24: Sample COM1 Connections
Signal
TxD Transmit RS-232
RxD Receive RS-232
Gnd Ground
TxD+ +Transmit RS-422, RS-485
TxD- -Transmit RS-422, RS-485
RxD+ +Receive RS-422, RS-485
RxD- -Receive RS-422, RS-485
Figure 2-25: COM1 Port Signals
2
) MAXIMUM
2
) MINIMUM.
Notes
Jumper to RxD1+ for RS-485
Jumper to RxD1- for RS-485
Jumper to TxD1+ for RS-485
Jumper to TxD1- for RS-485
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