Mettler Toledo IND231 Manuel D'installation page 32

8. Use a wire tie to secure the wires to the enclosure hinge wire.
2.4.7. COM1 Serial Port Connection
The COM1 port (REF) provides an RS-232 connection for external serial devices. Figure 2-33 and
Table 2-5 indicate which terminal carries which signal on the COM1 port (DSUB-9) of the IND231.
In the IND236, the RS-232 connector is on the mainboard (see Figure 2-16). The communication
cable enters the enclosure through a cable gland (see Figure 2-14) and connects to the COM1 port
on mainboard.
An example of connecting via RS-232 to external equipment is shown in Figure 2-34. Make the
connections as necessary.
2-18 METTLER TOLEDO IND231/IND236 Installation Manual
Figure 2-33: IND231 COM1 Port
Table 2-5: IND231 COM1 Port Signals
Terminal Signal
Pin 2 RxD RS-232 Receive
Pin 3 TxD RS-232 Transmit
Pin 5 Gnd Logic Ground
Pin 9 +5V Output Power
1. MAXIMUM CABLE LENGTH: 50 FEET (15 METERS).
2. WIRE SIZE: 18 AWG (.823 mm
Figure 2-34: IND236 Sample COM1 Connection
NOTES:
) MAXIMUM
2
24 AWG (0.205 mm ) MINIMUM.
2
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