Configuring the Encompass 4 Reader
8-17
You may also use command #6402 to turn on CW RF for diagnostic purposes. Enter-
ing this command transmits a continuous RF signal at the output frequency and atten-
uation level as specified in the respective associated commands until command
#6400 RF Off, #6401 RF On, or #641 Select RF-by-Input Control is received by
the reader. Tags are not read in CW mode. See
“640N RF Control” on page 7-34 for
more information.
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 com
-
puter 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 sense inputs. See the section
“Reports” on page 8-13.
The following procedures describe how to set sense inputs using the terminal emula-
tion software. See commands “526 Display I/O Status” on page 7-22, “694N Select
Input Inversion Option” on page 7-46, and “82N Select Input Status Change Report
Option” on page 7-50 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 Con
-
trol. 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).
The host computer can disable the predefined sense output control by issuing com-
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