54
13. SERIAL INPUT METER / REMOTE DISPLAY OPERATION
With a Basic counter main board and a serial interface board, the counter can operate as a
6-digit serial input meter (or remote display) to display serial data received from a computer or
PLC, or act as a slave display to another meter, counter or timer with a serial output. A signal
conditioner board is not required, but will not interfere with remote display operation if installed.
The serial I/O interface
can be provided by any of the following:
•
RS232 board:
single RJ11 connector for point-to-point communications.
•
USB Board:
Single standard USB connector for point-to-point communications.
•
USB-to-RS485 board:
Single standard USB connector and 1 RJ11 connector for multipoint
communications.
•
RS485 board:
two RJ11 connectors in parallel for multipoint communications with 2-wire
(half duplex) or 4-wire (full duplex) connection.
•
Modbus RS485 board:
two RJ45 connectors in parallel for multipoint communications with
2-wire (half duplex) or 4-wire (full duplex) connection.
•
Ethernet board:
RJ45 connector for standard Ethernet cable.
Slave display operation
to the RS232 output of another meter requires that the jumper
h
be
installed on the RS232 board of the slave meter. Also required is a
reversing phone cable
,
where the wire colors of the two connectors are reversed from left to right. For more infor-
mation, please see the Serial Communications Options Section 16 of this manual or the
Jumper Settings sections of the
Custom ASCII Protocol Serial Communications Manual
.
With an optional dual or quad relay output board
(contact or solid state relays), the serial
input meter can provide remote alarm or control capability. The meter can be programmed so
that the relays respond to the displayed reading or to received control characters. For setup
information, please see the Dual & Quad Relay Output Options Section 14 of this manual.
With an optional single or dual analog output board,
the serial input meter can provide
isolated, scalable 4-20 mA, 0-20 mA, 0-10V or -10 to +10V analog outputs which track the
displayed reading, thereby serving as a serial-to-analog converter. For setup information,
please see the Analog Output Option Section 15 of this manual.
Front panel setup
required for serial input meter (or remote display) operation is shown on
the next page. Two items require special explanation:
•
The first digit under
ConFig
item should to be set to a value
6
thru
C
. If no signal condi-
tioner board is detected, the meter defaults to setting
6
, where H, L, K commands are
enabled.
H
means display the remote data only.
K
means that the received value is stored
as Item #3, to become the source for alarm comparisons and analog output.
L
means both
H
and
K
. In slave mode, the remote meter can display any item of up to four data Items (or
string values), such as the Sum of Rates A & B (Item #1), Rate A (Item #2), or Rate B (Item
#3).
•
A timeout
ti_Out
can be set to a value from 10 ms to 199.99 sec. This is how long a serial
reading will be displayed in the absence of a new serial input. If timeout is set to 0, the
display will persist indefinitely in the absence of a new input.
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