Varec 2920 Installation And Operation Manual page 94

2920 Float & Tape Transmitter
84
Refer to the table below for more information on each Mark/Space option.
Display Only
Poll Addresses
Num Com Errors
Num Requests
Command
MS Bus Status
5 Display and Configuration Interface
Description
Displays the current addresses being polled by a
connected Host system
Displays the number of communication errors
Displays the number of times the Host system has polled
the transmitter
This parameter is both an indicator of the current Mark/
Space bus state and a control for changing or testing the
bus state. Selections are:
Bus Connected — Indicates the transmitter is currently
connected to the Mark/Space and the field relay is
closed.
If the bus is connected, the command to Isolated can be
issued to disconnect the transmitter and open the field
relay.
Bus Isolated — Indicates the transmitter is currently
disconnected from the Mark/Space bus and the field
relay is open.
If the bus is isolated, the command to Connected can be
issued to connect the transmitter back to the bus and
close the field relay.
Bus Test — This command initiates a test of the Mark/
Space interface hardware. The transmitter disconnects
from the bus and tests the transceiver hardware. If the
hardware test is successful, the transmitter reconnects
to the Mark/Space bus and the status displays
Connected. If the hardware test fails, the transmitter
remains disconnected from the bus and the status
displays Isolated.
Installation and Operations Manual