Controlling The Transmitter; Table 5-7: Transmission Control: J21(10) And J39(40) - Addi-Data ADDICOM PA 7400 Series Technical Description

PA 7400

Controlling the transmitter

Table 5-7: Transmission control: J21(10) and J39(40)

Mode Jumper settings
RS422
RS485
14
Description
Transmission is permanently enabled
Transmitter can be controlled by bit
DTRA(B)
Control with bit RTSA(B). Bit D1 of the
Modem Control Register A(B)
J39(40): No function
RTSA(B) = 0 Transmitter disabled
(Reset value)
RTSA(B) = 1 Transmitter enabled
The bit RTSA(B) simultaneously controls
the hardware pin RTSA(B) of the
DUART.
Automatic control
- RS485 transmitter disabled
- transmitter is disabled after the
transmission of a mark or a group of
marks
Control with bit DTRA(B). Bit D0 of the
Modem Control Register A(B)
J39(40): No function
DTRA(B) = 0 Transmitter disabled
(Reset value)
DTRA(B) = 1 Transmitter enabled
The bit DTRA(B) simultaneously controls
the hardware pin DTRA(B) of the
DUART.
Control with bit DATA-DIR-1(2)
Bit D0(2) of address Base-S1 +7
J39(40): No function
DATA-DIR-1(2) = 0 Transmitter
DATA-DIR-1(2) = 1 Transmitter
The bit DATA-DIR-1(2) can be read on
the address Base-S1 +7.
Technical description
disabled
(Reset value)
enabled
Chapter 5
Delivery
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