Connector And Cables - Intermec EasyCoder 501 Service Manual

Chapter 18
18. "uart1:"
18.1 Connector and
Cables
UART = Universal Asynchronous
Receiver and Transmitter
148
All EasyCoder 501 printers are fi tted with a DB-25pin male inter-
face connector on their rear plates (communication port "uart1:").
This connector can be used for an RS-232, an RS-422, or a 20
mA current loop interface depending on how the CPU board is
strapped. In the latter two cases, additional circuits must be fi tted.
The confi guration of the connection cable is also important.
-20 mA 2
+RS-422 In
+5V Ext.
-RS-422 In
+RXD
+RS-422 Out
DTR out
-RS-422 Out
-RXD
Signals on the printer's communication port "uart1:".
A shielded communication cable is required in order to comply with the
FCC/DOC approval and to avoid the risk of interference
1
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2
15
3
16
4
17
5
18
6
19
7
20
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9
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23
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24
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25
13
CAUTION!
to radio communications.
Intermec EasyCoder 501 – Service Manual Ed. 7
GNDC
GNDC
TXD out
RXD in
RTS out
CTS in
DSR in
GNDI
+20 mA 1
-20 mA 1
+TXD
-TXD
+20 mA 2
GNDC