HDSL2 for General Distribution Installation and Maintenance Practice Control Port Operation
61223HDSL2L2-5B 17
CONTROL PORT OPERATION
The H2TU-C modules provide a DB-9 connector on the front panel that supplies an RS-232
interface for connection to a controlling terminal. The pinout of the DB-9 is illustrated in
Figure 9.
Figure 9. RS-232 (DB-9) Pin Assignments
The Total Access 3000 H2TU-C Control Port access is provided via the DB-9 connector on the
Total Access System Controller Unit (SCU), P/N 1181018L1. This section will include Total
Access H2TU-C screens separately where they differ from other HDSL2 screens.
The terminal interface operates at data rates from 1.2 kbps to 19.2 kbps. (Total Access 3000
SCU default rate is 9.6 kbps.)
The asynchronous data format is fixed at the following parameters:
8 data bits; no parity; 1 stop bit
Disable the line wrap feature of the emulation program if necessary.
NOTE
If using a personal computer (PC) with terminal emulation capabil-
ity, be sure to disable any power saving programs. Otherwise, com-
munication between the PC and the HDSL2 unit may be disrupted,
resulting in misplaced characters or screen time outs.
Terminal Emulation Modes
An H2TU-C module supports two types of terminal emulation modes:
• Manual Update Mode - This mode is a dumb terminal mode, enabling easy access to print
screen and log files commands. This mode also includes a “3 SPACES TO UPDATE”
message on the top of the terminal screen (press the spacebar three times to update the
screen).
• Real Time Update Mode (default) - This mode is a VT100 terminal mode. This mode enables
all screen highlighting and cursor placement. Print screen and log file commands are not
available in this mode.
NOTE
The Manual Update Mode is not available on the Total Access 3000
H2TU-C.
6
7
8
9
1
2
3
4
5
TXD (Transmit Data)
RXD (Receive Data)
SGN (Signal Ground)
