GE Power Management
LPS-D Line Protection System
8-
29
8 LOCAL USER INTERFACE
8.4 REMOTE COMMUNICATION INTERFACE
8
8.4.2 MODEM CONNECTIONS AND SETTINGS
When establishing communication between the relay and a remote PC, two modems connected by a phone
line are required. One modem is located at the relay and the other modem at the PC. The pin connections for
the cable that connects the modem with either the relay or the PC is shown in Figure 8–3. Both modems must
be "Hayes-compatible," meaning that they accept standardized modem configuration commands first devel-
oped by Hayes. This is necessary since the ALPS-Link communications software that runs on the PC sends a
Hayes-compatible command string to the modem located at the PC. The LPS-D does not send any configura-
tion commands to its modem. Both the relay modem and the PC modem must be uniquely configured to permit
logging into and communicating with the relay using ALPS-Link software.
The required configuration settings are presented as changes to the factory-default configuration settings for a
Hayes V-Series 2400 SmartModem. The default settings are listed below.
Other "Hayes-compatible" modems may implement a subset of the full Hayes command set. It is the responsi-
bility of the customer to determine the exact commands accepted by a particular modem. The proper syntax for
entering the Hayes-compatible commands (sometimes referred to as the "AT" command set) is not described
here. Refer to the modem manual for an explanation of this syntax.
8.4.3 PC MODEM
The PC modem must be configured for "intelligent" (command recognition enabled) operation. For the Hayes
V-Series 2400 SmartModem, this setting is made with an internal jumper. The default settings listed in Section
8.4.2: MODEM CONNECTIONS AND SETTINGS are valid for ALPS-Link. The configuration settings critical to
the operation of ALPS-Link are sent to the modem from the software:
+++
(delay 2 seconds)
ATE0L0Q0S7=60V0X4Y0
These commands are explained in the table below:.
B1
P
Y0
&K3
&S0
S7=30
S11=95
S26=1
E1
Q0
&C0
&L0
&T4
S8=2
S12=50
S36=1
L2
V1
&D0
&P0
&X0
S9=6
S18=0
S37=0
M1
W0
&G0
&Q5
S0=0
S10=14
S25=5
S38=20
N1
X4
&J0
&R0
S6=2
Table 8–4: COMMAND SEQUENCE SENT BY ALPS-LINK TO MODEM
Command
Meaning
+++
Set modem to command mode
AT
Modem attention command
E0
disable command state echo
L0
Low speaker volume (desirable, not required)
Q0
Modem returns result codes
V0
Result codes returned in numeric form
X4
Enables result code features
Y0
Disable long-space disconnect
S7=60
Modem hangs up if no connection within 60 seconds
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Страница 226: ...7 4 LPS D Line Protection System GE Power Management 7 1 RATINGS 7 SPECIFICATIONS 7 ...
Страница 284: ...10 20 LPS D Line Protection System GE Power Management 10 8 HELP MENU 10 ALPS TEST PROGRAM 10 ...
Страница 334: ...A 4 LPS D Line Protection System GE Power Management A 1 FREQUENTLY ASKED QUESTIONS APPENDIXA A ...
Страница 412: ...C 34 LPS D Line Protection System GE Power Management C 3 POINT LISTS APPENDIXC C ...
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Страница 435: ...GE Power Management LPS D Line Protection System xiii INDEX INDEX tests 6 11 ZONE TIMER functional tests 5 10 ...
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