TEC Series v 3.2X
Page 20
G RO U N D
BUSY LOO P -
BUSY LOO P +
RCV LOO P -
RCV LOO P +
XMIT LOOP -
XMIT LOOP +
XM IT CUR R E NT SO U R CE
RC V CUR R EN T SO UR CE
BU SY CUR R E N T SO UR C E
RC V LE D
XM IT LED
REMO VE J2
FO R C U R REN T
LO OP
14. 0 Serial Port Adapter continued
For communications that must occur a longer
distance than 100 feet, (but less than 1000 feet) the
current loop may be used instead of the RS 232
signals. The three loops supported are the busy
loop, the receive loop and the transmit loop.
Because TEC printer messages are relatively
short, a busy signal control is not usually required.
The busy loop is only active for systems that have a
transaction buffer (See Pg. 52). The ground and the
transmit loop are the only signals usually required for
a printer. Information may be transmitted to the
printer at rates from 300 baud to 9600 baud. Many
serial printers that support current loop, restrict the
speed to 1200 baud. Baud rate may be selected
from the communications setup menu (see Pg. 52).
TERMINAL WIRING CONNECTIONS
For current converters that are not active current sources, a current
source may be selected from the board by placing a jumper (for example,
a jumper on J7-A for the transmit signal) at J-7. This will provide a
current loop source of approximately 20 ma. for a maximum distance of
1000 feet. Each signal that needs a current source
requires a jumper as shown below.
DB-9
DB-25
OR
TERMINAL
CONNECTORS
TX
RX
GND
TX
GND
RX
BSY
20
BSY
CURRENT LOOP
SERIAL
PORT
ADAPTER
NOTE: SHIELDED CABLE
MUST BE USED AND THE
SHIELD MAY NOT BE USED
AS A SIGNAL PATH.
Send Receive Lights
Available with 90 degree
connector, upright
connector (T101 style
shown) or current loop.
Use with standard DB9
Cable or wire.
(OPTIONAL)
(OPTIONAL)
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