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One of the most common questions we are asked is; “Can
I extend the length of the serial cable connected to the receiver?”
The answer is a yes. The limit, however, is 50 feet and the cabling must be non-shielded
and stranded, with three wires for the data line and 2 wires for the programming
section (a total of 5 wires). The pin-out for standard RS232 communication is
as follows.
| Receiver | Connection |
| Post #2 | Ground |
| Post #4 | TX
In | | Post #3 | TX
Out |
| Pin
assignments
DB-25 | | 2 |
TD | Transmit
Data | | 3 |
RD | Receive
Data | | 4 |
RTS | Request
to send | | 5 |
CTS | Clear
to send | | 6 |
DSR | Data
Set Ready | | 7 |
SG | Signal
Ground | | 8 |
DCD | Data
Carrier Detect | | 20 |
DTR | Data
Terminal Ready | | 22 |
Ring | Ring
Indicator | |
| Pin
Assignments
DB-9 | | 1 |
DCD | Data
Carrier Detect | | 2 |
RD | Receive
Data | | 3 |
TD | Transmit
Data | | 4 |
DTR | Data
Terminal Ready | | 5 |
SG | Signal
Ground | | 6 |
DSR | Data
Set Ready | | 7 |
RTS | Request
to Send | | 8 |
CTS | Clear
to Send | | 9 |
Ring | Ring
Indicator | |
| | | |
Null-Modem
Pinouts
DB-25 to DB-25 | 2 | to | 3 |
| 3 | to | 2 |
| 4 | to | 5 |
| 5 | to | 4 |
| 6 and 8 | to | 20 |
| 7 | to | 7 |
| 20 | to | 6
and 8 | |
Null-Modem
Pinouts
DB-9 to DB-9 | 1
and 6 | to | 4 |
| 2 | to | 3 |
| 3 | to | 2 |
| 4 | to | 1
and 6 | | 5 | to | 5 |
| 7 | to | 8 |
| 8 | to | 7 |
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Null-Modem Pinouts
DB-25 to DB-9
| 2 | to | 2 |
| 3 | to | 3 |
| 4 | to | 8 |
| 5 | to | 7 |
| 6 and 8 | to | 4 |
| 7 | to | 5 |
| 20 | to | 6
and 1 | | If
you wish to extend the cable further than 50 feet, you will need to use Powered
Serial Drivers (2 PSD's per cable). PSD's are good for about 2 miles in length
and use standard twisted pair. There are two drawbacks to using PSD's: #1. They
are expense, and; #2. You cannot easily use the programming portion of the cable,
which means that all programming must be done prior to the receivers installation
or with another serial receiver. Infrared
Transmitters
Looking
for sources of IR interference can sometimes be difficult. The first suspect should
be any ballast type of lighting. Using your 60703 IRT tester/programmer, set your
mode to “Analyze” and look for a frequency of between 50-55 Hz. If you
have a light source emitting any fixed frequency in this range, try to locate
your IRT Transmitters as far away from these lights as possible. Testing the IRTs
in different locations is the best way to determine how the interference will
affect the IRTs. To connect
a master to a slave you only need three wires; The 12V+, The SLV/MST connection
and any one of the two GND connections. This will parallel the power to both units
and send the data needed. Let's
talk about programming an IRT. To program an IRT masters ID you need to used the
IRT programmer/Tester unit. Turn on the unit. Using the right button enter
the program mode. Now using the top set of button enter in the desired ID number.
The IRT Master needs to have 12v DC power connected in order to program.
After powering up the IRT connect the programming cable. (This cable connects
to the back of the IRT tester/programmer to the 3 pin header Note: the orientation
does not matter.)After connecting the cabel to the IRT masters 3 pin header.
You should he a beep from the tester/programmer unit, this beep indicates the
programming has been completed. Please
Note: Actall Corp. cannot take responsibility for improper installation,
reconfiguration, rewiring or non-compliance without recommendations on installation.
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