LD4A05P0 Red Lion Controls, LD4A05P0 Datasheet - Page 14

• Manufacturer Part Number: LD4A05P0
• Description: 4" High 5 1/2 Digit Red LED Analog
• Manufacturer: Red Lion Controls
• Type: Ammeter/Process/Voltager

Specifications of LD4A05P0

• Accuracy: ±0.01% %
• Connection Type: Terminal Block
• Digit Height: 2.25
• Dimensions: 26"L×2.25"W×7.875"H
• Display Digit Height: 4 "
• Display Resolution: 16-Bit
• Display Type: LED
• Function: Ammeter/Process/Voltage
• Material, Casing: Aluminum
• Number Of Digits: 5
• Primary Type: Electronic
• Range, Measurement: -99999 to 999999
• Special Features: Programmable
• Voltage, Supply: 50 to 250/21.6 to 250 VAC/VDC
• Universal Dc Input: 200 μA to 200 mA, 200 mV to 200 V, and 4 to 20 mA/ 0 to 10 V
• Universal Power Supply: 50-250 VAC or 22-250 VDC
• Sensor Excitation: 24 VDC

Communication Format
In serial communications, the voltage is switched between a high and low level
at a predetermined rate (baud rate) using ASCII encoding. The receiving device
reads the voltage levels at the same intervals and then translates the switched
levels back to a character. The voltage level conventions depend on the interface
standard. The table lists the voltage levels for each standard.
characters (0 to
an optional parity bit and one or more ending stop bits. The data format and
baud rate must match that of other equipment in order for communication to
take place. The figures list the data formats employed by the meter.
Data is transferred from the meter through a serial communication channel.
Data is transmitted one byte at a time with a variable idle period between
* Voltage levels at the Receiver
LOGIC
1
0

INTERFACE STATE
space (active)
). Each ASCII character is “framed” with a beginning start bit,
mark (idle)
Character Frame Figure
TXD,RXD; +3 to +15 V
TXD,RXD; -3 to -15 V
RS232*
a-b > +200 mV
a-b < -200 mV
RS485*
14
Start Bit and Data Bits
receiving device to prepare for reception of data. One bit period later, the least
significant bit of the ASCII encoded character is transmitted, followed by the
remaining data bits. The receiving device then reads each bit position as they are
transmitted.
Parity Bit
a zero or a one, so that the total number of ones contained in the transmission
(including the parity bit) is either even or odd. This bit is used by the receiver
to detect errors that may occur to an odd number of bits in the transmission.
However, a single parity bit cannot detect errors that may occur to an even
number of bits. Given this limitation, the parity bit is often ignored by the
receiving device. The meter ignores the parity bit of incoming data and sets the
parity bit to odd, even or none (mark parity) for outgoing data.
Stop Bit
period pause to allow the receiver to prepare to re-synchronize to the start of a
new transmission (start bit of next byte). The receiver then continuously looks
for the occurrence of the start bit. If 7 data bits and no parity is selected, then 2
stop bits are sent from the meter.
Data transmission always begins with the start bit. The start bit signals the
After the data bits, the parity bit is sent. The transmitter sets the parity bit to
The last character transmitted is the stop bit. The stop bit provides a single bit