MODEL 1582-14 Data Switch
1.0 General
1.1 Equipment Description
- The 1582-14 Data Switch has two independent switches (A and B) in a single 1
3/4” chassis. Each switch provides Auto, Manual, or Remote relay switching between CH1 and CH2 RS422
clock or data signals on pins 3 and 8 with pin 5 ground and the other pins not connected.
Clock or data transitions are detected from pin 3 and a clock (or data) presence alarm is activated if
transitions are lost for a set period of time. The time period from a loss of transitions (on pin 3) to a presence
alarm is set with BCD switches on the PCB.
Alarm conditions on CH1 and CH2 are detected if clock is lost for a preset 0.1 to 0.9 seconds on the CH1 and
CH2 input or a contact closure (to ground or an open, selectable). Switching logic can be selected as follows:
1) CH1 Prime Mode
- Switches from CH1 to the CH2 only if CH1 alarms and CH2 is good. Switches
back to CH1 when it is no longer in alarm or when both CH1 and CH2 are in alarm.
2) Latch to CH2 Mode
- Switches from CH1 to CH2 if CH1 alarms and CH2 is good. Latches to CH2.
Push Reset or ground Remote Reset pin to return to CH1 if it has no alarm or both CH1 and CH2 are in
alarm.
3) Minimum Auto switching, Initial Channel Select (ICS) Mode
- Switch stays on channel last
selected by Manual or Remote selection after return to Auto if both channel alarms are clear or both
channels are in alarm. Auto switching occurs only if current channel alarms and the other channel is
clear.
Factory set mode is generally
(1) CH1 Prime Mode.
When power is first applied and there are no alarms, CH1 is selected. On power loss CH1 is the selected
channel. The Manual Select switch and contact closures to Remote Select pins (when in Auto), select CH1 or
CH2 independent of alarms. LEDs indicate alarm and switch conditions for CH1 and CH2, REMOTE or
MANUAL operation, and power on.
Data connectors are DB9, female. Contact closure inputs and outputs are via barrier strip. Dual power supplies
provide redundant power to the 1582-14. The chassis is a 1 3/4” rack mount.
SWITCH A
MODEL 1582
POWER
1 2
AUTO
CROSS TECHNOLOGIES, INC.
ON-
LINE
MANUAL
SELECT
REM
ON-
LINE
ALM
CH 1
CH 2
ALM
MAN
RESET
SWITCH B
AUTO
ON-
LINE
MANUAL
SELECT
REM
ON-
LINE
ALM
CH 1
CH 2
ALM
MAN
RESET
FIGURE 1.1 Model 1582-14 Front Panel
SELECTED
DATA OUT
DATA 1 IN
DATA 2 IN
AUTO
CH 1
CH 2
CONTROL
LOGIC
ALARM
DET CH1
ALARM
DET CH2
MANUAL
SELECT
1 2
REM
1 2
ALM
DATA
ALM
REM
RESET
FIGURE 1.2 Model 1582-14 Data Switch Block Diagram (Each Switch)
1582-14 Manual_A
Page 3
06/22/09
