Beijer Electronics QTERM®-A12 - Manual (Page 34)

Connector Pinouts Mechanical
28 QTERM-A12 Terminal
7.2 Connector Pinouts
7.2.1 Primary Serial Port
The following table shows the pinouts for each type of serial interface on the primary serial
port.
Power can be supplied to the terminal through pin 9 and ground return through pin 5 of the pri-
mary serial port connector.
C AUTION
For Class I, Division 2 installations:
Do not connect or disconnect cables while power is applied unless the area is known to be
non-hazardous.
Pin EIA-232 EIA-422 EIA-485
1 — — —
Figure 13
Female DB9 Connector
2 TX TX- RTX-
3 RX RX+ —
4 — — —
5 Ground Ground Ground
6 — — —
7 CTS (in) RX- —
8 RTS (out) TX+ RTX+
9 Power In Power In Power In
W ARNING
Although the terminal includes protection circuitry to prevent power supply contention,
power should not be simultaneously connected to both the 3-pin terminal strip and the pri-
mary DB9 connectors.
W ARNING
QTERM-A12 power must come from an SELV (Safety Extra Low Voltage) power source
and should have a current limit on its output of 5 Amperes. It must provide a minimum of 10
volts DC power and be limited to a maximum of 32 volts DC. Limiting may be inherent to
the supply or may be provided by supplementary overcurrent devices. If the QTERM-A12
does not respond or exhibits abnormal behavior on power up, disconnect power and contact
Beijer Electronics for technical support.