UBI EasyCoder 501 – Service Manual
135
18.1
Connector and Cables
18. "UART1:"
Signals on the printer’s
communication port “uart1:”
UART = Universal Asynchronous
Receiver and Transmitter
GNDC
2
1
3
4
5
6
7
8
9
10
11
12
13
15
14
16
17
18
19
20
21
22
23
24
25
GNDC
TXD out
RXD in
RTS out
CTS in
DSR in
GNDI
+20 mA 1
-20 mA 1
+TXD
-TXD
+20 mA 2
GNDC
-20 mA 2
+RS 422 In
+5V Ext.
-RS 422 In
+RXD
+RS 422 Out
DTR out
-RS 422 Out
-RXD
All EasyCoder 501 printers are fitted with a DB25 male interface
connector on their rear plates (comm. port "uart1:"). This connector
can be used for an RS 232C, 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 fitted. The configuration of
the connection cable is also important.
NOTE!
A shielded communication cable is required in order to comply
with the FCC/DOC approval and to avoid
the risk of interference to radio communications.
Содержание EasyCoder 501 SA
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