VISUAL 200 - Printer Interface; Figure 5-2 Current Loop Connections; Visual 200 Printer Interface

VISUAL TECHNOLOGY INCORPORATED, RAILROAD AVENUE, DUNDEE PARK, ANDOVER, MA 01810
FULL DUPLEX
+ 18 - .... f-------i+ I CU R RENT ~------
. SOURCE. COMPUTER TRANSMITTER
-17-.~--------------------------------- +
_
f------+~I CURRENTI-
+21 ~ ~----------
SOURCE COMPUTER RECEIVER
-25-~~------------------~-------------+
HALF DUPLEX
+ 18 -.. ----------+-11 CU R RENT ~------------
. SOURCE. COMPUTER TRANSMITTER
-17~
+21 .----J
c:
COMPUTER RECEIVER
-25-~~-------------------------------+
Figure 5-2 Current Loop Connections
The current loop interface
is limited to 50 volts (open Loop) and a minimum of 12 mao
(closed loop).
5.4.2
Printer Interface
The VISUAL 200 printer interface is a unidirectional RS 232 interface, terminated in a 25
pin recepticle. A
printer with an RS 232 interface and male connector which is designed to
connect to a modem can be plugged directly into the printer connector without additional
cables, adaptors,
or modification. Figure 5-3 details the pin assignments and signals for the
printer interface. The serial printer operates at the same baud rate and parity as the com-
munications interface.
Pin Number Signal Name Definition
1
AA
Protective Ground
3
BB
Receive Data (to printer)
5
CB
Clear to Send (always on)
6
CC
Data Set Ready (always on)
7
AB Signal Ground
8 CF Carrier Detect (always on)
Figure 5-3 Visual
200 Printer Interface
35