ALTUS Nexto NX3004 User Manual

4. Configuration
60
Parity
Serial port parity
configuration
None
Odd
Even
Parity Always One
Parity Always Zero
No Parity
Data Bits
Sets the serial
communication character
bits quantity
8
5, 6, 7 and 8
Stop Bits
Sets the serial port stop
bits
1
1, 1.5 and 2
Serial Mode
Sets the serial port
operation mode
configuration
Normal Mode
Extended Mode: Extended operation
mode which delivers information
regarding the received data frame.
Normal Mode: Serial communication
normal operation mode.
Table 4-15. RS-232 Standard Serial Configuration
Notes:
Extended Mode: This serial communication operation mode provides information regarding the data
frame received. The information available is the following:
One byte for the received data (RX_CHAR : BYTE): Store the five, six, seven or eight bits from the
data received, depending on the serial communication configuration.
One byte for the signal errors (RX_ERROR : BYTE): It has the format described below:
 Bit 0: 0 - the character in bits 0 to 7 is valid. 1 - the character in bits 0 to 7 is not valid (or it
cannot be valid), due to problems indicated in bits 10 to 15
 Bit 1: Not used
 Bit 2: Not used
 Bit 3: UART interruption error. The serial input remained in logic 0 (parity always zero) for a
time greater than a character (start bit + data bit + parity bit + stop bit)
 Bit 4: UART frame error. The logic 0 (space) was read when the first stop bit was expected and it
should be logic 1 (parity always one)
 Bit 5: UART parity error. The parity bit read is not correct according to the calculated one
 Bit 6: UART overrun error. Data was lost during the FIFO UART reading. New characters were
received before the later ones were removed. This error will only be indicated in the first
character read after the overrun error indication. This means some old data were lost
 Bit 7: RX line overrun error. This character was written when the RX line was completed,
overwriting the unread characters
Two bytes for the timestamp signal (RX_TIMESTAMP : WORD): Indicates the silence time,
within the 0 to 65535 interval, using 10us as base. It saturates in 655.35ms if the silence time is
higher than 65535 units. The RX_TIMESTAMP of a character measures the time from a reference
which can be any of the three options below:
 On most of the cases, the end of the later character
 Serial port configuration
 The end of serial communication using the SERIAL_TX FB, in other words, when the last
character is sent on line
Besides measuring the silence between characters, the RX_TIMESTAMP is also important as it
measures the silence time of the last character on the RX line.
The silence measuring is important for the correct protocol implementation, as MODBUS RTU, for
example. This protocol specifies an inter-frame greater than 3.5 characters and an inter-byte less than
1.5 characters.
Data Bits: The serial interfaces Data Bits configuration limits the Stop Bits and Communication
Parity fields. Therefore, the stop bits number and the parity method will vary according to the data

ALTUS Nexto NX3004 Specifications

General

Brand	ALTUS
Model	Nexto NX3004
Category	Processor
Language	English