Control Port Operation; Figure 5. Rs-232 (Db9) Pin Assignments - ADTRAN 220 HTU-C Installation And Maintenance Practice

CONTROL PORT OPERATION

The 220 HTU-C provides a faceplate-mounted DB9 connector that supplies an RS-232
interface for connection to a controlling terminal. The pinout of the DB9 is illustrated in
Figure 5.
The terminal interface operates at data rates from 1.2 kbps to 19.2 kbps. The asynchronous
data format is fixed at 8 data bits, no parity, 1 stop bit, and no flow control. The supported
terminal type is VT100 or compatible.
If you are using a personal computer (PC) with terminal emulation
capability, be sure to disable any power saving programs.
Otherwise, communication between the PC and the HDSL unit may
be disrupted, resulting in misplaced characters or screen time-
outs.
When operating the 220 HTU-C in the ADTRAN E220 Shelf with an
HFAC (HDSL shelf controller), all remote terminal operation must
be made through the control port of the shelf controller, not the
220 HTU-C. Terminal operation via the HFAC control port will vary
slightly from that described in the practice for the 220 HTU-C.
61247001L1-5A

Figure 5. RS-232 (DB9) Pin Assignments

NOTE
NOTE
Pin 5 - Signal Ground (SGN)
Pin 3 - Receive Data (RXD)
Pin 2 - Transmit Data (TXD)
Control Port Operation
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