Mettler Toledo IND570 Manual De Instalación página 80

2.4.5.12. COM1 Serial Port Connections
The COM1 port 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. In the POWERCELL version of the IND570, COM1 is
electrically isolated.
Figure 2-91 indicates which terminal carries which signal on the COM1 port. Make the connections
as necessary.
Terminal Signal Notes
TxD Transmit RS-232
RxD Receive RS-232
GND Logic Ground
TxD1+ +Transmit RS-422, RS-485 Jumper to RxD1+ for RS-485
TxD1- -Transmit RS-422, RS-485 Jumper to RxD1- for RS-485
RxD1+ +Receive RS-422, RS-485 Jumper to TxD1+ for RS-485
RxD1- -Receive RS-422, RS-485 Jumper to TxD1- for RS-485
+5V* 5 volts DC 100 mA nominal current
Figure 2-91: COM1 Port Signals
* The +5V connection is not present in POWERCELL version.
30205319 | 11 | 07/2019 METTLER TOLEDO IND570 Terminal Installation Manual 2-47