Western Telematic PollCat III, Руководство по обслуживанию

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4.1.1.1. Checking the PBX Interface with a
Breakout Box
A standard Breakout Box can determine which PBX interface pin
(usually pin 2 or pin 3) is used for data transmission.
1. If your Breakout Box that has two sets of LED's for each pin,
determine which LED indicates a negative voltage level.
2. Connect the Breakout Box to the PBX SMDR port and
monitor pins 2 and 3. One of these pins will indicate a
negative voltage level. The pin indicating the negative
voltage level is the transmit line.
3. If the PBX system does not require a handshake signal to
release data, you may see breakout box LEDs flicker
between positive and negative as call records are received.
4.1.1.2. Checking the PBX Interface with a
Voltmeter
A Voltmeter can also determine whether pin 2 or 3 is used for data
transmission.
1. Digital Voltmeter: Use pin 7 of the PBX SMDR Port (DB-
25 interface) as a ground and measure for voltage with the
red probe. The transmit line will register a -11.5 to -12 VDC
voltage level.
2. Analog Voltmeter: Reverse polarity by running the red
probe to pin 7, and then use the ground probe to measure
voltage. The transmit line will register a -11.5 to -12 VDC
voltage level.
4.1.1.3. PBX User's Guide
The best source of information regarding the PBX SMDR interface
is your PBX User's Guide. When reviewing the PBX User's Guide,
note that many manufacturers identify RS-232 pin assignments
based on the nature of the device that will be connected to the
system.
For example, a Transmit (TX) signal from the PBX may be
identified as a Receive (RX) pin in the PBX User's Guide, based
on the fact that the device connected to the PBX will receive this
signal. When referring to the PBX User's Guide, make certain to
determine the true direction of each signal.
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PollCat III Service Guide