Serial Interface Rs-232; Operating Principle; Fig. 10 Block Diagram - Serial Interface; Tab. 22 Elements Of The Serial Interface - Jetter JCM-501-E01 User Manual

Jetter AG

8.4 Serial interface RS-232

8.4.1 Operating principle

Block diagram
Elements of the
interface
User Manual – JCM-501-E01
The JCM-501-E01 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. 10: Block Diagram - Serial Interface
The user-programmable serial interface consists of the following elements:
Number Section
1 Interface driver
2 Addressee
3 Receive buffer
4 Receive register
5 Interface driver
6 Transmitter
7 Sending buffer
8 Transmit register
9 Status and control reg-
ister
Tab. 22: Elements of the serial interface
2
Receive-FIFO
Receiver
8
Transmitter
Transmit-FIFO
Function
Converts the signals of the interface into in-
ternal signal levels
Performs serial/parallel conversion
Buffer for received characters
Read access to this register reads the re-
ceived characters in the receive buffer (3).
Converts internal signal levels into interface
signals.
Performs parallel/serial conversion
Buffer for characters to be sent
Write access to this register causes the char-
acters to be entered into the transmit buffer
(7) and to be sent by the transmitter (6).
Query of filling levels and error states of buf-
fers; setting of transmission parameters
Programming | 8
3 4
5
7 6
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