OHAUS T72XW AM, Instruction Manual

Page: 17 / 143

7000 SERIES INDICATORS EN 9
COM1 Serial Port Connections
The COM1 port provides an RS-232 connection for external serial devices. Figure 1-7 indicates which indicator
carries which signal on the COM1 port. Make the connections as necessary.
Indicator Signal
TxD Transmit RS-232
RxD Receive RS-232
Gnd Logic Ground
Figure 1-7: COM1 Port Signals
An example of connecting via RS-232 to external equipment is shown in Figure 1-8. Make the connections as
necessary.
NOTES:
1. USE ONLY SHIELDED CABLE.
2. MAXIMUM CABLE LENGTH: 50 FEET (15 METERS).
3. WIRE SIZE: 18 AWG (.823 mm
2
) MAXIMUM
24 AWG (0.205 mm
2
) MINIMUM.
Figure 1-8: Sample COM1 Connections
PCB Switch Settings
PCB switch settings are described in this section, including settings for main PCB switches and the discrete I/O
switch
.
Main PCB Switches
A six position switch block (Figure 1-9) is located on the main PCB. These switches function as shown in Table 1-5.
Figure 1-9: Location of Switch Block 1 on the Main PCB
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