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5. CONTROL PORT OPERATION
The H2TU-C provides a faceplate-mounted DB-9
connector that supplies an RS-232 interface for
connection to a controlling terminal. The pinout of
the DB-9 is illustrated in Figure 7.
1
6
TXD (Transmit Data)
2
7
RXD (Receive Data)
3
8
4
9
SGN (Signal Ground)
5
Figure 7. RS-232 (DB-9) Pin Assignment
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 H2TU-C supports two types of terminal
emulation modes. The Manual Update Mode is a
dumb terminal mode, where the user can use print
screen and log files commands easily. This mode also
includes a "3 SPACES TO UPDATE" message on the
top of the terminal screen (press the space bar three
times to update the screen).
The Real Time Update 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.
The default Terminal Mode is Real Time Update.
NOTE
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 HDSL2
unit may be disrupted, resulting in misplaced
characters or screen time outs.
61222004L2-5A
Operation
For abbreviations used in the screen diagrams, see
Table 5. The HTU-C also provides a "Performance
Data Definitions Screen" which gives performance
monitoring related abbreviations, see Figure 16.
A
b
b
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i v
N
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T
C
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S
T
L
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S
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E
S
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B
8
Z
S
A
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I
A
T
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E
N
M
A
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B
O
B
P
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N
I
U
S
N /
5 1
M
4 2
H
Section 61222004L2-5, Issue 1
Table 5. Screen Abbreviations
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7
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