Installation and Wiring 9
2.7 Serial Port Wiring
Serial Port 1 is a bidirectional (full duplex) port supporting active 20 mA current loop communications. Port 1 is
optically isolated through the intrinsically safe I/O barrier.
The UMC 600IS serial port can be configured to communicate directly to a printer, remote display, or other
device using 20 mA communications through the I/O interface barrier (see Figure 2-7). Since the I/O barrier is
totally passive (not powered), the receiving device must also provide an active 20 mA current loop interface.
Figure 2-7. Intrinsically Safe System using Serial Communications
NOTE: The serial communications capability of the UMC
600IS is dependent on the product specifications of the
receiving device. All serial communications applications
should be tested with the I/O barrier in place.
Access to this serial communication port is through
the five-pin female connector (J3) located on the back
of the UMC 600IS indicator (see Figure 2-8). See the
output connector diagram in Figure 2-8 and Table 2-7
for connector and wire identification.
Figure 2-8. Serial Port, J3 Connector
Serial Port configuration is explained in greater detail
in Section 3.2 on page 16 of this manual.
Safe AreaHazardous Area
Divisions I and 2
Class I, Groups A, B, C, D
Class II, Groups E, F, G
Class III
FM-Approved
load cells
(Up to 4)
Battery Power
Supply Models
Only
Junction
Box
Cable 3
Load Cell
Cable 2
Serial I/O
Power
Supply
Cable 1
Power
115 VAC
I/O
Isolation
Barrier
Battery
Charger
1
6
2
7
3
8
4
9
5
0
CE
ENT
TARE
RECALL
ZERO
NET
GROSS
TARE
lb/kg
CONV
PRINT
1 SET
POINT
2 SET
POINT
CAPACITY
600 x 0.1
ZERO
NET
GROSS
lb
kg
MOTION
J1
J2 J3
J3
Port 1 (Full Duplex)
Serial Communication
D –RCVR
C +RCVR
B –XMTR
A +XMTR
J3 Pin Function
I/O Barrier
TB4 TB5
End Unit
A +XMTR 21 28 RXDCL+
B –XMTR 22 27 RXDCL–
C +RCVR 23 26 TXDCL+
D –RCVR 24 25 TXDCL–
E—
— SHIELD
Table 2-7. Serial Port Connector Wiring
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