DDS EX
Explosion-Proof Transmitter and Controller Instruction Manual
19
Using
P
RO
V
U
Serial Adapters
NOTICE
P
RO
V
U
expansion modules and serial adapters are not included in
the hazardous area approvals of the DSS EX. The PDA1232 may
be used only while the DSS EX is in a safe area, and will disable
some features while installed.
P
RO
V
U
expansion modules and serial adapters are not recommended for use with the DSS EX. It is
recommended that any serial protocol conversion required on the RS-485 communications connection be
performed using a PDA7485 RS-232 to RS-485 or PDA8485 USB to RS-485 serial converter located in a
safe area.
F4 Digital Input Connections
A digital input, F4, is standard on the scanner. This digital input connected with a normally open closure
across F4 and COM, or with an active low signal applied to F4.
Figure 9. F4 Digital Input Connections
Relay Connections
Relay connections are made to two six-terminal connectors labeled RELAY1 – RELAY4 on the back of the
scanner. Each relay’s C terminal is common only to the normally open (NO) and normally closed (NC)
contacts of the corresponding relay. The relays’ C terminals should not be confused with the COM
(common) terminal of the INPUT SIGNAL connector.
Figure 10. Relay Connections
!
P-
F4
P+
COM V+
3
4
1
2
5
mA+ COM V+ mA+
7
8
6
9
Ack
C
NO
NO
NC
NC
C
RELAY4
RELAY3
4
3
6
5
2
1
C
NO
NO
NC
NC
C
RELAY2
RELAY1
4
3
6
5
2
1
