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6.4.1
RS-232-C standard data interface via "EXT''-mode
If the TNC 151/TNC
155 is to operate as an RS-232-C standard data interface, the following
parameters
may be programmed
with "0":
218
219
220
221
224
Function
Parameter
No.
Data format and transmission
stop for RS-232-C/V.24
data
interface
222
0
bit
0 = 0
7 data bits (ASCI l-code with 8th bit = parity)
0 = I*
8 data bits (ASCI l-code with 8th bit = 0,
9th bit = parity)
1 = 0
no BCC check
1 = 1
BCC no control character
2 = 1
Transmission
stop through
RTS
3 = 1
Transmission
stop through DC3
4 = 0
Character parity even
4 = 1
Character parity odd
5 = 1
Character parity required
7,6
= 00
1 l/2 stop bits
=Ol
2
stop bits
=lO
1
stop bit
=I1
1
stop bit
*Please note:
With hardcopy printout
of a graphics image, the TNC automatically
switches to 8 data bits.
Transfer blockwise
(as of software level 05)
With blockwise transfer from an external computer
to the TNC, data flow is no longer controlled
via RTS
or DC3, but only via the control characters ACK and NAK.
Control via DSR, DTR
If the control switches the RTS-output
to 0 V, the output
DTR is simultaneously
switched to 0 V (connected
to the DSR-input
of the peripheral
unit). If the DSR-input
of the peripheral unit is not allowed to be switched
to 0 V during data transmission,
a logical "1" should be connected to DSR via a bridge connection.
Example for the determination
of the entry value
Data format:
7 data bits (ASCI l-code with 8th bit = parity)
Transmission
stop through DC3
Character parity even
Character parity required
1 stop bit
bit 0 - Y7
7
6
5
4
3
2
1
0
Value
128
64
32
16
8
4
2
1
Insert 0 or 1 as appropriate
1
0
1
0
1
0
0
0
Determilned entry value for parameter 222: 168
59
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