Sense Inputs
Both the RS
–
232 and RS
–
422 configurations used by the Encompass 4 Reader have two sense
inputs — sense input0 and sense input1. The default configuration uses sense input0 as the presence
detection device line. RF power is automatically turned on only when the presence detection device
(loop detector or other device) detects a presence. Sense input1 is not used directly by the reader; it is
used by the host computer to monitor an external device. The Encompass 4 Reader sense inputs are
designed to connect to a dry contact closure.
You can configure the Encompass 4 Reader to generate input status change reports, which are
transmitted like tag IDs. The host can then respond based on the true/false (closed/open) status of the
The following procedures describe how to set sense inputs using the terminal emulation software. See
“526 Display I/O Status” on page 7–105
“694N Select Input Inversion Option” on page
“82N Select Input Status Change Report Option” on page 7–131
for more information.
To set sense inputs
1. Ensure that the host computer is in command mode.
2. Enter command
#526
to display the current input/output status.
•
C0 = host controls outputs
•
C1 = predefined output mode
•
O0 = both outputs off
•
O1 = output0 on
•
O2 = output1 on
•
O3 = both outputs on
•
I0 = both inputs false
•
I1 = input0 true
•
I2 = input1 true
3. Enter command
#6940
to disable input inversion (factory default) or command
#6941
to enable input inversion, and press
ENTER
.
Sense Output Devices
Both the RS
–
232 and RS
–
422 configurations used by the Encompass 4 Reader have two sense output
circuits – sense output0 and sense output1.
By default, the Encompass 4 Reader operates in predefined output mode where sense output0 and
sense output1 are asserted every time a unique valid tag is read. Both sense output devices are
asserted by issuing command
#621 Predefined Output Control.
The devices are not asserted
when tags are acquired in the transmit all or buffer all ID mode or when the Encompass 4 Reader is
operating in Wiegand mode. The sense output pulse duration is variable (command
#67N
).
Chapter 8 Configuring the Encompass 4 Reader
TransCore Proprietary
8–143
Summary of Contents for encompass 4
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