12
OEM Series™ I/O Guide
MDS 05-3624A01, Rev. B
6
OUT
DSR—Data Set Ready. Active when radio is powered on.
7
--
Signal Ground. Connects to ground (negative supply
potential) at radio’s PC board.
8
OUT
DCD—Data Carrier Detect. Active when receiving
data from another OEM Series radio with the same
network address.
11
OUT
Receive Audio Output. For test purposes only.
12
--
Sleep Mode. A logic low on this pin removes power from
the radio. The radio is ready to operate 75 milliseconds
after the ground is removed.
18
IN/OUT
Accessory Power. Unregulated Output. Provides a
source of output power for low current (1 Amp max.)
accessories. Excessive drain on this connection causes
the on board fuse (2 ampere) to open. The voltage at this
pin matches the input voltage to the transceiver. Do not
use this pin for powering the radio.
19
OUT
5.8 Vdc Regulated Output. Provides a source of
regulated voltage at 100 mA for low power accessories.
23
IN
Auto-Open. A logic low (less than 0.5 volts or ground)
on this pin opens the diagnostic channel and disables
normal data operation. A logic high (greater than 4 volts or
open) enables the DATA INTERFACE for normal data
operation.
25
OUT
Alarm. A logic low (less than 0.5 volts) on this pin indicates
normal operation. A logic high (greater than 4 volts)
indicates that some alarm condition is present. This pin
can be used as an alarm output, provided the internal
series resistance of 1 k
Ω
is considered.
Table 4. DATA INTERFACE Connector Pinouts (Continued)
Pin
Number
Input/
Output
Pin Description
