Table 18: Rs-232 Field Wiring On Xrc - ABB XSeriesG4 User Manual

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RS-232 communication test

The following RS-232 Serial Communication Test procedure is directed from Figure 84: Communication troubleshooting flow

chart, and will assist the user with what may be the possible cause for an indicated error message.

Before performing this test, please verify that the field wiring is correct (see Table 18).

NOTE: When troubleshooting RS-232 mode, verify the termination settings of COMM1-J17 and COMM2-J10 on

XRC

have pins 2 and 3 jumpered.

Step-by-step instructions

NOTE: Voltage on the following steps may be hard to see using a digital multimeter. If available, an oscilloscope

will provide a more accurate reading. To verify, the host software must be continuously polling the XRC

Generally speaking, these tests performed on the termination board will only verify incorrect or damaged wiring. If all previous

testing passed, and all wiring, jumpers and terminations have been verified correct, the board will need to be replaced. Contact

Totalflow Technical Support. See Getting Help in the introduction of this manual for instructions.

Using an oscilloscope, measure Receiving Data voltage on the electronic board J8 or J10 between: COMM 1 or 2, pin 2

(Ground) and pin 7 (Receive Data). When the unit is receiving data from the host, the voltage should vary between -5 Vdc

and +5 Vdc. This would indicate that the unit is receiving data. Continue to Step 2. If the unit is not receiving data,

investigate wiring issues (see Table 18).

Using an oscilloscope, measure Request to Send voltage on electronic board J6 between: COMM 1 or 2, pin 2 (Ground)

and pin 5 (Request to Send). When unit is communicating to the host, voltage should be +5 Vdc and remain +5 Vdc until

XRC

transmit stops. This would indicate that the unit is transmitting data. Continue to Step 3. If unit is not receiving

data, investigate wiring issues (see Table 18).

Using an oscilloscope, measure transmit data voltage on the electronic board J8 or J10 between: COMM 1 or 2, pin 2

(Ground) and pin 9 (Transmit Data). When the unit is transmitting to the host, voltage should vary between -5 Vdc and +5

Vdc. This would indicate that the unit is transmitting data. If unit is still not responding, continue to next test as directed in

Figure 84: Communication troubleshooting flow chart.

RS-485 communication test

The following RS-485 Serial Communication Test procedure is directed from Figure 84: Communication troubleshooting flow

chart and will assist the user with what may be the possible cause for an indicated error message.

Before performing this test, please verify that the field wiring (see Table 19) is correct and that RS-485 terminations are pinned

correctly (Table 20).