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QTERM-R55 User's Manual
QSI Corporation Fax 801-466-8792 Web www.qsicorp.com Phone 801-466-8770
3.4.3
EIA-485 Interface
The EIA-485 interface is similar to EIA-422, but was
designed as a half-duplex multidrop interface. With proper
cabling and termination, up to 32 EIA-485 devices can be
connected across a cable of up to 1000 meters in length.
The EIA-485 interface on the QTERM-R55 uses two com-
munication lines and two power lines.
Output Wiring Detail
Ground
6
Function
+5VDC Out
LowBAT
+5VDC Out
Ground
Function
BATSLP
2mm
1
2
3
4
5
Ground
+5VDC Out
5
6
Ground
Function
2mm
1
Rx
232
CTS
4
3
Tx
2
RTS
485
RTx-
-
-
RTx+
N/C
+8-32VDC In
Ground
Function
Tx+
Tx-
Rx-
Rx+
422
Ground
Rx-
Tx+
Rx+
422
Function
+5VDC Out
Tx-
2
RTS
RTx+
+8-32VDC In
1
2mm
232
Function
Rx
Function
RTx-
485
Auxilliary Output
Battery Back
Standard Output
R55 CPU PCB
3
6
5
4
+8-32VDC In
Tx
Ground
CTS
Ground
-
-
Figure 3-5. QTERM-R55 Panel Mount Output Wiring
Optional E-Stop Switch
23
Front View
197
DB9
Side View
21
Back View
For discrete wires
Gasket is included
184
7
Mounting Bracket
1 of 4
Auxillary Port
31
Figure 3-6. Dimensions of the QTERM-R55 Large Character Panel-Mount Terminal.