
Appendix C— Communications Reference
102
EasyCoder 4420 and 4440 Bar Code Label Printer User’s Manual
Shield
Printer
25-Pin (Socket) D-Sub
Metal Backshell
Chassis Ground
Transmitted Data
Received Data
Request to Send
Clear to Send
Data Terminal Ready
Signal Ground
25-Pin (Plug) D-Sub
Metal Backshell
Chassis Ground
Transmitted Data
Received Data
Request to Send
Clear to Send
Data Terminal Ready
Signal Ground
Modem
➤
➤
➤
➤
➤
1
2
3
4
5
20
7
1
2
3
4
5
20
7
44XXU076.eps
Straight Through DTE to DCE Cable:
This illustration shows the pin assignments for
the straight through DTE to DCE cable used with a modem (P/N 043237S). If you find
that you are losing data, you may need to isolate the chassis ground from one of the
two devices by connecting it to the shield.
Note:
The metal backshell is connected directly to the shield to achieve
electrostatic discharge (ESD) immunity.
44XXU077.eps
Printer
Host
1
13
16
14
19
1
19
14
16
13
➤
➤
Input RxDB
Input RxDA
Output TxDA
Output TxDB
+
-
-
+
➤
➤
Shield
RS-422 serial interface:
This illustration shows the pin assignments for the RS-422
serial interface. The host in this case includes Intermec products that support RS-422.
Non-Intermec controllers may have different pin assignments.
Note:
Connect pin 1 to shield at one end only.