EasyCoder 4420/4440 Bar Code Label Printer User’s Manual
C-10
RS-232, RS-422, and RS-485 Serial Interface Pin Assignments
Interface Pin No. 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 connection 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.
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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