CAS NT-302A - Interface and Communication; Serial Interface (RS-232 C)

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6. InterFace
1. Serial Interface
RS-232C Serial Interface is sensitive/weak for electric Noise.
So, please isolate with AC power cable and use shield cable to reduce the electric noise effect.
1-1. Signal Format
①. Type : EIA-RS-232C
②. Communication Method : Half-Duplex, Full Duplex, Asynchronous
③. Serial Baud Rate : Selectable on “F-function31”
④. Data Bit : 8(No Parity mode, only)Bit – Refer “F30”.
⑤. Stop Bit : 1
⑥. Parity Bit : Non, Even, Odd (Selectable on “F-function 30”) - Refer “F30”
⑦. Code : ASCII
STX 02H
ETX 03H
CR 0DH
LF 0AH
1
+9V
LSB
0
1
2
3
4
5
MSB
6
0
-9V
Start Bit
Data Bit
Parity
Bit
Stop
Bit
1.2. Standard Data Format(1) : ID Number will not be transferred. (Refer “F-function 35”)
,
,
+/-
Including Decimal
point
k
g
CR
LF
Header
1.
Header
2.
Data Byte ( 8 or 9 byte )
(F38 setting)
Unit
①. Header 1. : OL : Over Load, Under Load
ST : Display weight “Steady”
US : Display “Un-Steady”
②. Header 2. : NT : Net-Weight
GS : Net-Weight, under TARE
③. Data Bit(Number) 2B(H) : “+” Plus
2D(H) : “-“ Minus