Com1 Serial Port Connection - Mettler Toledo IND500x Installationsanleitung

Terminal
GND
U4
GND
U5
GND
U6
NC
See also
Connections Page 12

2.4.6 COM1 Serial Port Connection

The COM1 port includes connections for an intrinsically safe serial device. The figure below indicates which
terminal is which signal on the COM1 port. The cable length of this connection is limited to 10m (33 ft.).
Figure 20: COM1 Port
COM1 Port Signals
Terminal
J605-1
J605-2
J605-3
J605-4
An example of connecting to an RS-232 device in the safe area through a Zener diode barrier is shown in the
figure below. Refer to the entity approval values of COM1 when selecting a barrier. Note that seals and other
protective devices will also be required to meet hazardous area wiring codes.
Figure 21: Sample RS-232 Connection
A barrier that has been tested for correct operation with the IND500x, and can be connected directly to COM1,
is:
MTL7761Pac (FM and ATEX approvals)
24 Installation​ ​
Ex Area
Barrier
Wire Color
--
Gray
--
Black
Red
Blue
--
Signal
TxD - Transmit data
RxD - Receive data
GND - Logic Ground
GND - Logic Ground
Safe Area
RS232 Device
IND500x