Fluke 225C User Manual - Page 83

RS-232 Bus & Modbus IEA-232/RS-232, RS-232 Bus Measurement Connections

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RS-232 Bus & Modbus IEA-232/RS-232 Default probe setting 10:1. Use the Fluke 10:1 probe. 1 Connect the red probe to the test tool input A. 2 Connect the probe ground lead to the RS-232 bus Signal Ground. 3 Connect the probe tip to the RS-232 bus TxD or RxD. TxD or RxD GND 6 Using The Bushealth Function Input Connections and Tested Signals Table 5. RS-232 Bus Tested Signal Properties Signal V-Level High V-Level Low Data Rise Fall Jitter Overshoot Description High level voltage Low level voltage Bit width Rise time as % of bit width Fall time as % of bit width Jitter distortion Overshoot distortion Note Continuous data traffic is not ensured . See Data Traffic on page 70 Figure 39. RS-232 Bus Measurement Connections 73

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Using The Bushealth Function
Input Connections and Tested Signals
6
73
RS-232 Bus & Modbus IEA-232/RS-232
Default probe setting 10:1. Use the Fluke 10:1 probe.
1
Connect the red probe to the test tool input A.
2
Connect the probe ground lead to the RS-232
bus Signal Ground.
3
Connect the probe tip to the RS-232 bus TxD or
RxD.
TxD or RxD
GND
Figure 39. RS-232 Bus Measurement Connections
Table 5. RS-232 Bus Tested Signal Properties
Signal
Description
V-Level High
High level voltage
V-Level Low
Low level voltage
Data
Bit width
Rise
Rise time as % of bit width
Fall
Fall time as % of bit width
Jitter
Jitter distortion
Overshoot
Overshoot distortion
Note
Continuous data traffic is not ensured . See Data
Traffic on page 70