Section 8 Interfaces; General; Rs232 Interface; Rear Panel Connections - LSI M-Three Operator's Manual

SECTION 8 INTERFACES
8.1 GENERAL
The M-THREE has two standard interfaces and an optional third.
These interfaces and their respective rear panel connectors are as
follows:
a) The RS232 and 20m A Current Loop interfaces which are
accessible via a 25-way D-type connector marked 'RS232'.
(PORT 1)
b) A Parallel Printer interface which is accessible via a 36-way
'Delta' socket marked 'PRINTER'. (PORT 2)
c) An optional General Purpose Interface Bus (GPIB) which is
accessible via a 25-way 'D-type' plug marked 'GPIB' when
fitted. (PO RT 3)
8.2 RS232 INTERFACE
This interface is intended for serial communication between suitable
printers (e.g. daisy wheels), remote terminals and other computers.
The normal 'handshake' signals are incorporated for use if required.
8.2.1 Rear Panel Connections (25-way D-type Socket)
Pin No. Signal
1
Protective Ground (Chassis)
2
Transmitted Data (From M-THREE)
3
R~ceived Data
4 Request To Send [RTS]
5
Clear To Send [CTS] (From M-TH REE)
6
Data Set Ready [DSR] (From M-THREE)
7
Signal Ground
17 Current Loop Tx+
18
Current Loop CL
20
Data.Terminal Ready [DTR]
23 Current Loop Rx-
24 Current Loop Tx-
25
Current Loop Rx+
The minimum RS232 interface requirement from this connector is a
standard 3-wire interface on Pins 2,3 and 7 (Pins 4 and 5 [RTS +
CTS] must be connected together).
8-1