Specifications

Q7760A SLTA 10 SERIAL LONTALK
®
ADAPTER
5 95-7511—4
Table 1. SLTA-10 Interface.
CABLING AND CONNECTIONS
EIA-232 devices are configured as either Data Circuit-
terminating Equipment (DCE), or as Data Terminal Equipment
(DTE). The SLTA-10 is a DCE device. A DCE device connects
to a DTE device unless a null modem cable is used. Using a
null modem cable, a DCE device connects to another DCE
device, and a DTE device can connect to another DTE device.
The standard configuration for a PC port is a DTE device. A
PC usually takes the terminal role in communications.
Modems should always be DCE devices. To connect an
SLTA-10 to a PC, connect one end of the serial cable to the
SLTA-10, and the other end of the cable to the PC serial port.
Connecting an SLTA-10 to a modem, requires a special null
modem cable.
NOTE: A standard off-the-shelf null modem cable does not
work with this configuration.
Honeywell offers the SLTA-10 Null Modem Cable (part
number 32002517-001) that is a DB-9 male to DB-25 male
null modem cable.
Attaching SLTA-10 to a Modem
IMPORTANT
You must use the specific null modem cable
described in Table 2, to attach the SLTA-10 to a
modem.
Table 2. DCE Modem To SLTA-10 Connection
(DB-25 To DB-9).
See Fig. 11 to attach an SLTA-10 to a modem.
Fig. 11. Attach SLTA-10 to a modem.
CAUTION
Equipment Damage Hazard.
This product contains components that are sensitive to
static electricity. Before installing or removing the
network or serial cables, touch earth ground with your
hand to discharge any static electricity that may have
accumulated.
Attach SLTA-10 to a PC with DB-9
Connectors (Direct Connection).
When connecting to a PC equipped with a DB-9 connector,
use a straight-through cable with one end terminating in a
DB-9 male connector and the other end terminating in a DB-9
female connector. See Table 3.
Interface Function
Service Button S2
Pressing this switch grounds the service request pin on the Neuron
®
Chip inside the
SLTA-10. While this switch is pressed, the service LED should light to maximum intensity.
Service LED DS1 Yellow (LED) Indicates the Service Button is being pressed. If the Service button is not
being pressed, there are three possibilities: ON: The SLTA-10 firmware has detected an
unrecoverable error and/or the node has no application. Reboot the SLTA-10 from another
network interface on the channel. Blinking: Node is configured. OFF: Node is configured or
there is no power. Check LED.
EIA-232 Data Port J5 Connector for the EIA-232 serial I/O port. Standard DB9 female connection.
Network Connector 2 position J1 Orange connector for attachment to a twisted pair channel. The provided mating plug is
Weidmüller PN135606 (obtain locally).
Unregulated AC/DC power input 2
position J3
Black connector for the power input. The provided mating plug is Weidmüller PN125911
(obtain locally).
Unregulated AC/DC power input
barrel connector J2
Female 2.1 mm inside diameter and 5.5 mm outside diameter power input barrel connector.
Power indicator LED DS2 Green LED indicates presence of input power of the SLTA-10.
Modem Signal
Name
Cable DB-25
Male
Cable DB-9
Male
SLTA-10
(DCE) DB-9
Female
RXD—Pin 3 Pin 3 Pin 3 TXD—Pin 3
TXD—Pin 2 Pin 2 Pin 2 RXD—Pin 2
DCD—Pin 8 Pin 8 Pin 4 DTR—Pin 4
DTR—Pin 20
RTS—Pin 4
Pin 20 and
Pin 4
Pin 6 DSR—Pin 6
GND—Pin 7 Pin 7 Pin 5 GND—Pin 5
M17231
A
MODEM
DB25
MALE
DB9
MALE
SLTA-10
SLTA-10 NULL
MODEM CABLE