Control Port Operation; Figure 6. Rs-232 (Db9) Pin Assignments - ADTRAN HDSL DDM+ HTU-C Installation And Maintenance Practice

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice

CONTROL PORT OPERATION

The DDM+ HTU-C provides a front panel-mounted DB9 connector that supplies an RS-232
interface for connection to a controlling terminal. The pinout of the DB9 is illustrated in
Figure 6.
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, and 1 stop bit. The supported terminal type is
VT100 or compatible.
If 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.
16

Figure 6. RS-232 (DB9) Pin Assignments

NOTE
Pin 5 - Signal Ground (SGN)
Pin 3 - Receive Data (RXD)
Pin 2 - Transmit Data (TXD)
61247003L6-5A