Intermec EASYCODER 7421 User Manual
Page 79
B-9
Pin
Name
Operation
3
Receive Data
Input: Connect to transmit data pin of
connected device.
2
Transmit Data
Output: Connect to receive data pin of
connected device.
6
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.
5
Ground
To enable communications, connect to
signal ground of connected device.
Completes circuit for all RS-232 signals.
7
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.
8
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.
9
Printer Status
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.