IBM 3164 ASCII Manual page 134

30
Word Length for main port
31 Response Delay for main port
32 Break Signal for main port
33 Pacing for Main Port
34 Line Speed for auxiliary port
35 Parity for auxiliary port
36
Stop Bit for auxiliary port
37 Word Length for auxiliary port
38 Pacing for auxiliary port
This parameter is used to select from either of the following data lengths:
• 7-bit Character Set
• 8-bit Character Set.
This parameter is used to specify the minimum response delay time when
a Read command is received. Either no delay or 100 ms can be selected.
This parameter is used to determine how long the break (space) signal
sent to the host system will be when the Break key is pressed. In
PRTS/I PRTS mode, either 170 ms or 500 ms can be selected.
This option allows the terminal or host system to control the data flow.
Data flow in both directions is paced.
The pacing function is performed only when the following
communication interface/line control is specified:
• EIA RS-422A
• EIA RS-232C with PRTS
• EIA RS-232C with IPRTS.
If pacing is specified fer the outbound data stream, the display station
sends the XOFF signal to the host in order to prevent a buffer overrun.
When the host system receives the XOFF signal, it must stop the
outbound data flow immediately, otherwise that data will be lost. When
the host system receives the XON signal. it resumes the outbound data
transmission.
Outbound Data Stream
. .
Host 3164
Outbound Pacing (XOFF/XON)
If pacing is specified for the inbound data stream, the host system sends
the XOFF signal to the display station in order to stop the inbound data
transmission. When the display station receives the XOFF signal, it stops
the inbound transmission immediately, and waits for XON. When the
display station receives XON, it resumes the inbound data transmission.
I
Inbound Data Stream
Host
I I
3164
I ~----------------------~I
'--_ _ _ -' Inbound Pacing (XOFF/XON) ' - - - - - - '
Pacing is not possible if the DC3 ch3racter is used as the line turnaround
character.
The description for the main port appl~es. Refer to No. 26.
The description for the main port applies. Refer to No. 27.
The description for the main port applies. Refer to No. 29.
The description for the main port applies. Refer to No. 30.
If pacing is specified for the outbound data stream, the auxiliary device
sends the XOFF signal to the IBM 3164 to stop the outbound data
transmission. When the IBM 3164 receives this XOFF signal, it displays
AUX BUSY, and stops the data transmission to the auxiliary device
immediately. The IBM 3164 does not inform the host of the XOFF state.
It waits for the next XON signal from the auxiiiary device, and after it
receives this signal, resumes the outbound data transmission.
, I ________
O_u_tb_o_u_n_d __ D_a_ta __ St_r_ea_m ______ ~~1
..
l
'-
I
Auxiliary
3164 Device
,"-_ _
~J
Outbound Pacing (XOFF/XON)
L'"-__ ---'
5-47