Red Lion LD - Manual (Page 6)

6
4.0 R
EVIEWING THE
F
RONT
P
ANEL
K
EYS AND
D
ISPLAY
5.0 P
ROGRAMMING THE
M
ETER
Parameters
Output
Setpoint
Parameters
Input Setup
Pro
DISPLAY
MODE
Panel Key Rate Setup
Parameters
3-dSP
Parameters
Display and Front
NO
PAR
SEL
PAR PAR PAR PAR
2-rAtE 1-INP 4-SPt 5-SEr
PAR
Serial
Setup
Parameters
OVERVIEW
PROGRAMMING MENU
KEY DISPLAY MODE OPERATION PROGRAMMING MODE OPERATION
PAR Access Programming Mode Store selected parameter and index to next parameter
RST 
SEL 
Resets count display(s) and/or outputs
Index display through selected displays
Increment selected digit position of parameter value
Advance through selection list/select digit position in
parameter value
OPERATING MODE DISPLAY DESIGNATORS
“  ” - To the left of the display is the rate value.
- Counter A has no designator.
“  ” - To the left of the display is the Counter B value (dual count or batch).
“ 1 ” - To the right of digit 6 indicates setpoint 1 output status.
“ 2 ” - To the right of digit 1 indicates setpoint 2 output status.
Pressing the SEL  key toggles the meter through the selected displays. If display scroll is enabled, the display will toggle automatically every four seconds
between the rate and count values.
Sections 4 and 5 apply to Programmable Models Only
RS232 Communications
RS232 is intended to allow two devices to communicate over distances up to
50 feet. Data Terminal Equipment (DTE) transmits data on the Transmitted Data
(TXD) line and receives data on the Received Data (RXD) line. Data Computer
Equipment (DCE) receives data on the TXD line and transmits data on the RXD
line. The LD emulates a DTE. If the other device connected to the meter also
emulates a DTE, the TXD and RXD lines must be interchanged for
communications to take place. This is known as a null modem connection. Most
printers emulate a DCE device while most computers emulate a DTE device.
Some devices cannot accept more than two or three characters in succession
without a pause in between. In these cases, the meter employs a busy function.
As the meter begins to transmit data, the RXD line (RS232) is monitored to
determine if the receiving device is “busy”. The receiving device asserts that it
is busy by setting the RXD line to a space condition (logic 0). The meter then
suspends transmission until the RXD line is released by the receiving device.
RS485 Communications
The RS485 communication standard allows the connection of up to 32
devices on a single pair of wires, distances up to 4,000 ft. and data rates as high
as 10M baud (the LD is limited to 38.4k baud). The same pair of wires is used
to both transmit and receive data. RS485 is therefore always half-duplex, that is,
data cannot be received and transmitted simultaneously.
1
TXD
RXD
COMM.
LD METER (DTE)
RECEIVING DEVICE
2
RXD
TXD
3
3 2
7 5 5
DTE
3
2
DB9
2
3
DTE DCE
DB25 DB25
Terminal Block Connection Figure
5
LD METER RECEIVING DEVICE
+5V
4
47K
47K
3
B (-)
A (+)
COMM.*
Transmit
Enable
* OPTIONAL
Terminal Block Connection Figure
PROGRAMMING MODE ENTRY (PAR KEY)
It is recommended all programming changes be made off line, or before
installation. The meter normally operates in the Display Mode. No parameters
can be programmed in this mode. The Programming Mode is entered by
pressing the
PAR key. If it is not accessible, then it is locked by either a security
code or a hardware lock.
MODULE ENTRY (SEL
 & PAR KEYS)
The Programming Menu is organized into five modules. These modules group
together parameters that are related in function. The display will alternate between
 and the present module. The SEL  key is used to select the desired module.
The displayed module is entered by pressing the PAR key.