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Appendix C— Communications Reference Cd 39 Helvetica CondensedHelvetica
92 EasyCoder 3400e Bar Code Label Printer User’s Manual
Printer Serial Port
The rear panel of the printer contains the serial port connector. It is a
25-pin D-style subminiature receptacle. The port is wired as a data
terminal equipment (DTE) device.
3XXXU.063
13
12
11
10
9
8
7
6
5
4
3
2
1
25
24
23
22
21
20
19
18
17
16
15
14
PS
SG
CTS
RTS
RD
TD
GND
DTR
Serial port pin assignments: This illustration shows the serial port pin assignments.
Shield
PC
Printer
25-Pin (Socket) D-Sub
Metal Backshell
25-Pin (Plug) D-Sub
Metal Backshell
Chassis Ground
Transmitted Data
Received Data
Request to Send
Clear to Send
Data Set Ready
Ground
Data Terminal Ready
Carrier Detect
Chassis Ground
Received Data
Transmitted Data
Carrier Detect
Data Terminal Ready
Ground
Data Set Ready
Clear to Send
1
2
3
4
5
6
7
20
8
1
3
2
8
20
7
6
4
5
3XXXU010.eps
RS-232 null modem cable for PC/XT: This illustration shows the pin assignments for
the RS-232 null modem cable for the PC/XT (P/N 048668).
Note: The metal backshell is connected directly to the shield to achieve
electrostatic discharge (ESD) immunity.