RS-232 Signals:
2.0 DESCRIPTION
The Model 1000P Asynchronous Short Range Modem uses the latest
surface mount technology to attain high quality short range modem
performance in a low profile package. The unit operates full duplex at data
rates to 19.2 Kbps over 2 twisted pair. Requiring no AC power or batteries, the
Model 1000 supports distances to 17 miles (27.2km).
With an externally accessible DCE/DTE switch, the Model 1000P allows
easy connection to any device without opening the unit. Three enclosure
options allow terminations to be via RJ-11, RJ-45 or terminal blocks. A
unique strain relief prevents thin twisted pairs from breaking or pulling loose.
The Model 1000P uses the latest in bi-directional, clamping, transient
suppressors to protect itself and connected equipment against harmful transient
discharges. For surge handling capability, the Model 1000P is compliant with
IEC 801.5 level 2, 1kV.
3
PIN
CIRCUIT
DESCRIPTION
SIGNAL TYPE DIRECTION
1
AA
Protective Ground
Ground
2
BA
Transmitted Data
Data
To DCE
3
BB
Receive Data
Data
From DCE
4
CA
Request to Send
Control
To DCE
5
CB
Clear to Send
Control
From DCE
6
CC
Data Set Ready
Control
From DCE
7
AB
Signal Ground
Ground
8
CF
Data Carrier Detect
Control
From DCE
9
DC Voltage
20
CD
Data Terminal Ready Control
To DCE
Pins 1 and 7 are tied together
Pins 4 and 5 are tied together
Pins 6, 8 and 20 are tied together
Table 1. Model 1000P Transmission Distances
The Model 1000P has the option of being configured as either DCE or DTE
devices. Set the switch located on the top of the printed circuit board to the DCE or
DTE position
NOTE: You do not have to open the plastic case to change the switch setting.
4
DCE
DTE
These distances are for a noiseless environment with
20% or less of peak-to-peak gross distortion. Distances
and rates listed are 1000P to 1000P
DATA
RATE
(BPS)
Wire Gauge
19 AWG
( 0.9 mm)
24 AWG
( 0.5 mm)
26 AWG
( 0.4 mm)
19,200
6.2(9.9)
3.7(5.9)
1.2(1.9)
9,600
7.5(12.0)
4.9(7.8)
2.5(4.0)
4,800
8.7(13.9)
5.6(9.0)
3.7(5.9)
2,400
11.8(18.9)
8.0(12.8)
4.9(7.8)
1,200
17.0(27.2)
11.8(18.9)
8.0(12.8)
Figure 1. Model 1000P DCE/DTE Switch