Serial Interface Rs-232; Operating Principle; Fig. 11 Block Diagram - Serial Interface - Jetter JVM-104-O15 User Manual

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7.4 Serial interface RS-232

7.4.1 Operating principle

Block diagram
Elements of the in-
terface
JVM-104-O15 User Manual
Features
SAEJ1939
SetSPNConversion()
SAEJ1939
GetSPNConversion()
For more information on the subject STX API Functions refer to the application-
oriented manual "SAE J1939 STX API" available for download on our
page.
The JVM-104-O15 has a user-programmable RS-232 interface.
The OS provides a receive buffer and a transmit buffer for the user-program-
mable serial interface. These buffers can be used to adjust the transfer rate be-
tween application program and serial interface.
The following illustration shows the block diagram of the user-programmable se-
rial interface:
1
Driver
9
Driver
Fig. 11: Block Diagram - Serial Interface
The user-programmable serial interface consists of the following elements:
Number Section
1 Interface driver
2 Addressee
3 Receive buffer
Description
Calling up the function SAEJ1939SetSPNConver-
sion() defines the arrangement of bytes in the
message which is requested by the SAE-
J1939GetDM1() or SAEJ1939GetDM2() func-
tion.
Calling up the function SAEJ1939GetSPNConver-
sion() determines the currently set conversion
method.
2
Receive-FIFO
Receiver
8
Transmitter
Transmit-FIFO
Features
Converts the signals of the interface into
internal signal levels
Performs serial/parallel conversion
Buffer for received characters
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