R232C Interface - Sharp MZ-350C Service Manual

M Z 3500
6. R232C INTERFACE
6-1. General specification
Input/Output formal
No of channels
Code used
Baud rate
Transmission System
Synchronization method
Communication control
procedure
Data formal
LSI used
RS-232C bit Serial input/output
1 channel
JIS 7-channel/JIS 8-channel
110 to 9600bits/sec
Half-duplex
Start-stop
Non-procedure
Stop bit: 1/1.5/2, with or without
even or odd parity.
8251ACor82S3C-5
(Programmable Interval Timer)
6-2. Data transmission format
2° 2
1
2
2
2
3
2
4
2
5
2
6
7-bit,
with parity
v ,,-
* \
v — „ — 1
Start bit
Data bit (7 bits) Parity bit Stop bit (1 or 2 bits)
7-bit.
without parity
v. ^ — /^ / ^ . ; _'
Start bit
Data bit (7 bits) Stop bit
8-bit.
with parity
^
8-bit.
without parity
y
5tart bit
s
,
Start bit
, . ^ ^^ '
Data bit (8 bits) Parity bit Stop bit (1 or 2 bits)
_^ _'
Data bit (8 bits) Stop bit (1 or 2 bits)
Example: 7-bits, even parity, 1 stop bit
2° 2
1
2
2
2
3
Start bit
Stop bit of preceding data
7-bit data (26H)
Parity bit l Start bit o'f
| succeeding data
Stop bit
-71