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QTERM-R55 User's Manual
19
QSI Corporation Fax 801-466-8792 Web www.qsicorp.com Phone 801-466-8770
3.4
Interfaces
3.4.1
EIA-232 Interface
With proper cables and good grounding, the EIA-232 inter-
face on the QTERM-R55 can communicate up to about 15
meters.
Handshaking between the host computer and the QTERM-
R55 is optional. This is done using software flow control
(XON/XOFF) or the EIA-232 modem-control lines (such
as RTS and CTS). Note the non-standard pinout for the
RTS and CTS lines on the DB9 connector.
3.4.2
EIA-422 Interface
With proper cables and grounding, the EIA-422 interface
can communicate up to a distance of about 1,000 meters.
The EIA-422 version of the QTERM-R55 uses four com-
munication lines and two power lines.
Table 3-2. QTERM Pin Assignments
Handheld
6-pin
Modular
6 x 1
2 mm
DB9
Female
QTERM
EIA-232/
5VB
Function
QTERM
EIA-422
Function
QTERM
EIA-485
Function
1
1
3
receive
+receive
RTx-
2
2
6
RTS*
-receive
RTx+
3
3
2
transmit
+transmit
no connect
4
4
1
CTS*
-transmit
no connect
5
5
9
power
power
power
6
6
5
ground
ground
ground
*if the hardware flow control option is enabled
Figure 3-4. QTERM-R55 Assembly and Panel Cutout Dimensions.
Panel Cutout