Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 317)

Setting Up Terminals D–5
Publication 2755-833
6. When the Select CRT Type menu appears, select Data General
DT100 emulation.
7. You are now ready to configure the decoder. See Chapter 5.
Follow these steps if using an Allen-Bradley 1770-T1, -T2, or -T3
terminal:
1. Construct a cable to connect the decoder to Channel B of the
terminal. Use a Belden 8303, Alpha 45123, or equivalent type of
cable. Use the following connector pinouts:
2
3
7 2
3
7
Note: Connect shield to shell
of cable connectors at both ends.
18
25
.
.
Transmit Data
Receive Data
Signal Ground
C
B
D
NEMA NEMA
Type 1 Type 4
25-pin Male
Decoder Terminal
Male 19-pin NEMA Type 4 or Female
25-pin D Shell Connector
2. Plug terminal into power supply.
3. Install the alphanumeric keytop overlay on the terminal keyboard.
4. Power on terminal. Enter 12 to select alphanumeric.
5. Select Alphanumeric Mode and set the following parameters
(Refer to your terminal documentation for additional
information):
Baud Rate 9600
Parity = No
Stop Bits = 1
Channel Config. = B IN/OUT
Duplex = Full
Channel C = On or Off
Cursor = On
Auto Line Feed after Return = Off
Control Code Display = Off
6. You are now ready to configure the decoder. See Chapter 5.
Note: Because there is no flow control with the 1770-T1, -T2, or
-T3 terminals, the Series B Revision A decoder could transmit data
too quickly. This caused the terminal to display garbled characters or
lock up. To resolve that problem, the Revision B decoder sends data
in smaller bursts to these terminals.
Allen-Bradley
1770-T1, -T2, -T3 Terminals