Appendix C— Communications Reference
3400, 3440, and 3600 Bar Code Label Printer User’s Manual 99
RS-422 Serial Interface
Use the RS-422 interface in long line point-to-point direct connect
installations. The printer cable must have the pin assignments for an RS-
422 serial interface shown in the table on this page.
RS-485 Serial Interface
Use the RS-485 serial interface for Multi-Drop installations only. The
printer cable must have the pin assignments for an RS-485 serial interface
shown in the table on this page.
RS-232, RS-422, and RS-485 Serial Interface Pin Assignments
Interface Pin Name Operation
RS-232/422/485 1 Chassis Ground
(GND)
Connect to pin 1, chassis ground, of connected device.
RS-232 2 Transmit Data
(TD)
Output: Connect to receive data pin of connected device.
RS-232 3 Receive Data
(RD)
Input: Connect to transmit data pin of connected device.
RS-232/422/485 4 Request to Send
(RTS)
Output: When you use a modem, connect to modem RTS
pin. The modem sets RTS to true before transmission. The
printer sets RTS to false after transmission.
RS-232/422/485 5 Clear to Send
(CTS)
Input: When you use a modem, connect to modem CTS pin.
The modem must set CTS true before the printer transmits
data. If not connected, CTS sets itself true.
RS-232/422/485 7 Signal Ground
(SG)
To enable communications, connect to signal ground of
connected device. Completes circuit for all RS-232 signals.
RS-232/422/485 11 Printer Status
(PS)
Output: When not using software flow control
(XON/XOFF), connect to input of connected device (for
example, CTS). Indicates printer mechanical status and status
of printer input buffer.
RS-422/485 13 Input B Input: Serial differential data to the printer.
RS-422/485 14 Output A Output: Serial differential data from the printer.
RS-422/485 16 Input A Input: Serial differential data to the printer.
RS-422/485 19 Output B Output: Serial differential data from the printer.
RS-232/422/485 20 Data Terminal
Ready (DTR)
Output: When you use a modem, connect to modem DTR
pin.
When using Intermec Standard Protocol, this pin indicates
that the printer is switched on.
When using XON/XOFF or hardware flow control, this pin
indicates the printer mechanical status and the status of the
printer input buffer.
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