Table 4-2: Connector Digital
Signal name
Commo
n point
Direc-
tion
State after
connection
Description
DI<13…1>
DGND
Input
Input
16-bit digital input, where
DI1 is the low bit, DI16 is the high bit of the 16-bit
word. The inputs DI14, DI15, DI16 are described below,
they have alternative programmable functions for the
synchronization inputs. The DI input does not bypass the
external TTL source, even when the E-502 power is off.
DI14/
DI_SYN2
DGND
Input
Input
Digital input DI14 or synchronization input DI_SYN2
(software selection). The input is compatible with the
output logic level of the TTL/CMOS- cells with a supply
voltage of +2.5 V to +5 V. There is a Schmitt trigger at
this input. There is a software option to turn the 1k pull-
up resistor to a high logic level at this input. The
DI/DI_SYN2 input does not bypass the external TTL
source even when the E-502 power is off.
DI15 /
СONV_IN
DGND
Input
Input
Digital input DI15 or synchronization input CONV_IN
(software selection). Input of the synchronization pulse
of the ADC-DAC conversion (from the neighboring
module E-502). It is programmable to turn on a pull-up
resistor of 360 ohms to a low logic level at this input.
The DI15/СONV_IN input does not bypass the external
TTL source, even with the E-502 power off. The input is
compatible with the output logic level of the
TTL/CMOS- cells with a supply voltage of +2.5 V to +5
V. There is a Schmitt trigger at this input.
DI16 /
START_IN
DGND
Input
Input
Digital input DI16 or synchronization input START_IN
(software selection).
Input of start signal of ADC-DAC and input-output
(from neighboring module E-502). Active logical signal
level is high. It is programmable to turn on a pull-up
resistor of 360 ohms to a low logic level at this input.
The DI16/START_IN input does not bypass the external
TTL source, even when the E-502 power is off. The
input is compatible with the output logic level of the
TTL/CMOS- cells with a supply voltage of +2.5 V to +5
V. There is a Schmitt trigger at this input.
DO<16…1>
DGND
Output
Z-state
16-bit digital output, where
DO16 – high bit, DO1 – low bit of the 16-bit word.
Lines DO1 ... DO8 refer to the low byte, and lines DO9
... DO16 - to the high one. Program control Z- state is
independent for the high and low bytes. It is possible to
force the active state of the outputs of each byte when
the power is turned on by installing jumper, section
CONV
_OUT
DGND
Output
Output
The output of the ADC-DAC conversion pulse and the
I/O (to the neighboring E-502)
START
_OUT
DGND
Output
Output
The output of the ADC-DAC start signal and the I/O (to
the adjacent E-502 module).
Active logical signal level is high.
DGND
—
—
—
A
"common wire"
circuit for digital inputs and outputs.
