2.2Testing Communications, Continued
Procedure, continued |
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Table 2 | Testing Communications with Transmitter, Continued | ||||||||||||
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Step | Press Key |
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| Read Display or Action | Description |
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5 |
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| Message exchange is taking place |
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| T | A | G | N O . |
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| S | F | C | W O R K | I | N | G . . . |
| Note that communications with |
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| transmitter are blocked until [ID] key |
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| is pressed |
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| Transmitter is in analog |
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| L | I | N | D P | T | A | G N O . |
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| _ |
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| transmission mode. “LIN” means |
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| transmitter is set for linear output |
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| OR |
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| instead of square root (SQRT). “DP” |
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| means transmitter is differential |
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| pressure type instead of gauge |
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| pressure (GP) or absolute pressure |
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| (AP). Last eight columns in bottom |
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| row are blank when no tag number |
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| has been assigned to this |
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| transmitter. Go to Step 8. |
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| D E – X M T R T A G N O . |
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| Transmitter is in digital (DE) |
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| transmission mode. Last eight |
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| OR |
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| columns in bottom row are blank |
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| when no tag number has been |
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| assigned to this transmitter. Go to |
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| Step 7. |
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| T | A | G | N O . |
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| N O X M T R | R E S P O N S E |
| Communication error messages are |
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| cycled at two second intervals and |
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| display returns to initial prompt. Go |
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| to Step 6. |
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6 |
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| There is a communication problem, | Correct any wiring, resistance, or |
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| check the |
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| power supply problems, and try |
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| • power and SFC connections - Is the | communicating again - Press [ID] |
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| polarity correct; red to positive and | key. |
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| black to negative? |
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| If you are still not getting the |
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| • loop resistance - Is there a minimum | correct display, note error |
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| messages and refer to |
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| of 250 ohms resistance between the |
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| Troubleshooting section in the |
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| SFC and the power supply? |
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| transmitter’s User’s Manual |
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| • power supply - Is power applied, is |
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| there greater than 11 volts at the |
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| transmitter, and are you within the |
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| operating area on the curve in Figure |
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| 13? |
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| Continued on next page | |
8 | ST 3000 Release 300 Installation Guide | 2/05 |