ALARM/STATUS
RS232
Chapter 3 Features and Functions
Outputs
ALARM/STATUS Port
This
The pin assignments are described in Table
Table 3-1. ALARM/STATUS Port Pin Assignments
Pin | Signal | Description |
Number |
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|
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|
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1, 5, 9 | GROUND | Signal return, ground potential. |
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|
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2, 3, 4 | ALARMS OUT | TTL |
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|
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6, 7 | ALARMS IN | TTL |
|
|
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8 | ________________ | Do not use or ground. |
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See the section “Different Ways to Check Alarm Status,” which discusses three different ways you can check the alarm status of the 58502A.
ALARM/STATUS Port Outputs
The output pins (2, 3, and 4) of this port, shown in Figure
Alarm Outputs
ALARM/STATUS
1 2 3 4 5
6 7 8 9
Figure 3-1. Alarm Outputs
All of the output pins are at a TTL high when there is no alarm condition. When an alarm condition exists, all of the output pins drop to a TTL low. These outputs echo the state of
User’s Guide |