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PM-1
PARALLEL MODEM
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PM-1
Parallel modem
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| The PM-1 parallel modem from Hedin Tex converts
the parallel interface to a M-1 modem interface.
Thus the interface is enabled to be extended by a
private 4-wire connection (2 pairs) up to 15 km, depending
on speed, and by means of the PM-1 to be
converted to a parallel interface or a M-1 short-distance
modem to a serial V.24/RS232 interface.
The parallel interface on the PM-1 may be configured
as an input or output, and uses ACKNLG and
BUSY as handshake signals. This interface status is
in each case transmitted directly to the M-1 modem
interface to avoid data loss. The parallel connection
is a 25-pin DSUB socket.
Data are transferred from the M-1 modem interface
by a tristate current loop which provides reliable
connection even when lines are poor and the
surrounding area is full of interference. Both devices
are galvanically insulated from each other by
optocoupler interfaces. The transient protection in
the modems provides good protection against lightning
and overvoltages, and the galvanic insulation
provides protection where there are differences in
potential.
The handshake signals of the parallel interface
are transmitted between the devices by a software
handshake, on the basis of Xon/Xoff, or by a hardware
handshake (modem status) between the modems.
If one of the devices is an M-1 short-distance
modem, any V.24/RS232 interface can assume the
status of parallel interface.
In the operating modes 1200, 2400, 4800, 9600,
19200 and 57600 bits/s, the modem interface can
be operated with 7 or 8 bits and no, even or odd
parity. The PM-1 parallel modem meets the most
stringent requirements in terms of reliability, operation
and performance, and because of its simple
handling the device can be installed without problem.
The PM-1 is integrated in a small, compact
table-mounted casing with its own power supply for
230 V AC operating voltage. The signal status is displayed
by means of LEDís (Power, TD, RD and DCD)
on the front panel.
The Hedin Tex product PM-1 has a short delivery.
Your contact partner will be pleased to provide you
with information and answer any questions you may
have.
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| Extends a parallel printer interface to up to 15 km |
| Parallel interface configurable as output or input |
| Asynchronous 4-wire transfer by the M-1 modem interface |
| Galvanic insulation by optocouplers |
| 1200, 2400, 4800, 9600, 19200 and 57600 bits/s transfer speed |
| Transient protection |
| LED displays |
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| Technical data |
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| Interface 1:
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Configurable parallel Centronics input or output.
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| Bush and ACKNLG as handshake signals.
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| Paper Out, Select, Error at fixed levels. (25-pin DSUB socket)
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| Interface 2:
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10mA symmetrical tristate current loop (5-pin plug) 4-wire transfer data format: 7, 8 bits;
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| no, even, odd parity
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| 1 stop bit. Speed: 1200, 2400, 4800, 9600, 19200, 57600 bits/s
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| Xon/Xoff handshake (11 hex/13 hex) or M-1 hardware (modem status).
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| LED displays:
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Network, TD, RD and DCD
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| Insulation:
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Galvanic insulation of the data transfer by optocouplers
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| network insulation by transformer. The protective deflector serves to deflect the fault current.
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| Insulation voltage:
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420 Vrms
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| Transient protection:
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Suppressor diodes and varistors
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| Supply voltage:
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230V AC + 15%, 50/60 Hz
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| Network cable:
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Detachable, 1.8 m
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| Current consumption:
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15 mA maximum at 230V AC
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| Temperature range:
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5-50°C ambient temperature
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| Humidity range:
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0-95% relative humidity
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| Dimensions in mm:
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129 x 47 x 135 (WxHxD)
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| Weight:
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0,4 kg
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| Casing material:
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Plastic ABS, black
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| aluminium back
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| Assembly:
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Rubber pads or Velcro tape
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| Conformity:
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CE
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| Other model versions
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| PS-1:
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Serial/parallel converter, with 9-pin DSUB socket for the V.24/RS232 interface
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| Parallel connection 1 input/output
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| Range of parallel interface
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The range of the parallel interface is 5 metres maximum
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| Range of the M-1 modem interface
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 Catalogue entry
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