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Q232-STS
RS-232 Serial Transfer Switch
Overview
The QuEST Q232 Serial Transfer Switch transfers RS-
232 signals from a primary communications link to a
backup communications link. Designed for railway
applications, the Q232-STS meets the demanding
environmental requirements of Class C wayside
signal equipment.
The Q232-STS is packaged in a low-profile rugged
plastic case with ears for wall mounting.
Power is connected to a two-wire removable plug
connector. The serial data connectors are DB9 male
for the primary and backup links and DB9 female for
the interlocking controller connection.
The Q232-STS will transfer to the backup link when
the backup communications equipment asserts its
DCD signal and transmits data. When the backup
link de-asserts its DCD signal, the Q232-STS will
switch back to the primary link.
Product Features
•
10 – 32 VDC Input Voltage Range
•
2,000 Vrms isolation
•
-40 to 70° C Operating Range
•
Supports data rates up to 57,600 bps
•
Transfers from primary to backup link when
Backup DCD and RXD signals are active
•
Status and data activity LEDs
095-160140-1000, Rev. A00
User Manual
Specifications
Serial Ports
Primary Port
Backup Port
Controller Port
Data Rate
Isolation
Power Input
Power Connector
Wire Size
Input Voltage
Power Consumption
Fuse
Reverse Polarity
Protection
Indicators
Power
RS-232 Signals
Link Active
Mechanical
Dimensions
Case Material
Environmental (AREMA Class C Compliant)
Operating Temperature
Operating Humidity
Ordering Information
PN: 800-160140-0001
Email PO to:
© QuEST Rail LLC 2018
User Manual
DB9 M (RXD, TXD, RTS, DCD, and
COM)
DB9 M (RXD, TXD, RTS, DCD, and
COM)
DB9 F (RXD, TXD, RTS, CTS, DCD,
and COM) CTS connected to RTS
Up to 57,600 bps
2,000 Vrms (60 Hz, 3 mA maximum
leakage for 60 s)
Note: No isolation between primary
and backup ports.
2-position removable terminal block
22 to 14 AWG
10 to 32 VDC
0.7 W (12 VDC), 1.9 W (32 VDC)
2 A
Yes
Green LED
Yellow LEDs
Blue LEDs
7.285 x 4.72 x 1.25 in.
Flame retardant ABS
-40 to 70° C
0 to 95% non-condensing
orders@questrail.com
1
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Summary of Contents for Quest Engineering Q232-STS
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Page 1: User Manual
0.7 W (12 VDC), 1.9 W (32 VDC) the interlocking controller connection. Fuse Reverse Polarity The Q232-STS will transfer to the backup link when Protection the backup communications equipment asserts its Indicators DCD signal and transmits data. When the backup... -
Page 2: Typical Application
Radio Modem Controller Operation Galvanic Isolation When the Backup Port DCD signal is de- The Q232-STS provides 2,000 Vrms isolation asserted, all communication signals are routed between the following circuits: between the Primary Port and Controller Port. • Battery Input When the Backup Port DCD signal is asserted •...
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