Mettler Toledo IND570 Manual Del Usuario página 56

COM3 provides RS-232, RS-422 or RS-485 connections, which is identical to COM1 on the Main
board except the +5 VDC supply on the last terminal is not provided. Refer to the COM1 connection
section described previously for instructions for wiring to this port. Review Figure 2-32 and Figure
2-33 for additional details.
2.4.6.3. Discrete I/O Options
Four Discrete I/O option boards are available, as shown in Table 2-4, only one of which can be
installed at a time.
2-26 METTLER TOLEDO IND570 Weighing Terminal Installation Manual
Figure 2-40: Wiring to COM2
THE INTERNAL DISCRETE I/O RELAY OPTIONS #30113540, OR #30113542 MUST NOT BE
USED IN AREAS CLASSIFIED AS HAZARDOUS BECAUSE OF COMBUSTIBLE OR EXPLOSIVE
ATMOSPHERES. FAILURE TO COMPLY WITH THIS WARNING COULD RESULT IN BODILY HARM
AND/OR PROPERTY DAMAGE.
NOTES:
1. USE ONLY SHIELDED CABLE.
2. MAXIMUM CABLE LENGTH: 50 FEET (15
METERS).
3. WIRE SIZE: 18 AWG (.823 mm2) MAX.
24 AWG (0.205 mm2) MIN.
WARNING
30205319 | 04 | 08/2016