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57512L-004 Rev. A 110PAX4/R110PAX4 User Guide 6/29/11
RS-232 Interface Connections
The print engine is configured as Data Terminal Equipment (DTE). Figure 34 shows the
internal connections of the print engine’s RS-232 connector.
Figure 34 • RS-232 DB9 MLB Connections
Pin 9 is also available as a +5 VDC signal source at 750 mA. The maximum current draw may
be limited by option configuration.
Note • Use a null modem (crossover) cable to connect the print engine to a computer or any
other DTE device.
Important • To enable this capability, a qualified service technician must install a jumper on
the print engine’s main logic board on JP1, pins 2 and 3.
+5VDC signal source
RXD (receive data) input
TXD (transmit data) output
DTR (data terminal ready) output
SG (signal ground)
DSR (data set ready) input
RTS (request to send) output
CTS (clear to send) input
+5VDC signal source
+5VDC signal source
RXD (receive data) input
TXD (transmit data) output
DTR (data terminal ready) output
SG (signal ground)
DSR (data set ready) input
RTS (request to send) output
CTS (clear to send) input
+5VDC signal source
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
R1
R1
+5VDC
+5VDC
1 K
1 K