Command Messages
Chapter Nine: RS-232 Communications
268
Unlatch Currently Alarmed Relays
Refer to Chapter Three: Overview, for a description of the latching state. There are two ways to
unlatch currently alarmed relays; either send the RS-232 command, or set a TTL signal high (the
latch pins are located on the General I/O connector). This action releases the latch on the alarm
so the relay can resume normal operation. If the pressure is within the defined operating range,
the alarm will resume its untripped state. If the pressure is outside of the defined operating
range, the alarm will resume its tripped state. The state of the relay latching pin (high or low)
determines whether the alarm will become latched. If the pin is high the latching state is
deactivated; if the pin is low the latching state is activated.
Status Alert
When the status alert function is enabled, the 146 unit automatically sends a message to the host
computer whenever an alarm is tripped.
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