HEIDENHAIN TNC 407 (243 020) Technical Manual - Manual (Page 670)

01.98
TNC 407/TNC 415/TNC 425 2 TNC data interfaces 8-23
The DTR and DSR signals from the TNC indicate the operational status of the TNC and peripheral
(these cannot be set via the machine parameters).
DTR: Interrogated by peripheral; it is logic "1" if TNC is ready for service.
DSR: Interrogated by TNC.
LOW level => ext. data input/output not ready.
HIGH level => ext. data input/output ready.
Software handshaking
Bit 3 determines whether the TNC stops transfer from an external device with control character
. Transfer is resumed with character .
If transfer is stopped with character , up to 12 characters can still be stored. The remaining
incoming characters are lost. Software handshake is normally recommended when interfaces are
connected to an external device.
The following pin layout is possible for the external device:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
• •
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
ge
gn
rs
gr
br
rt
bl
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
• •
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
•
ws/br
WH/BN
GND Chassis
RXD
TXD
CTS
RTS
DTR
GND Signal ground
DSR
GND
TXD
RXD
RTS
CTS
DSR
GND
DTR
V.24-Adapter-Block
RS-232-C Adapter block
• •
•
• •
• •
Peripheriegerät
Peripheral unit LE
ws/br
WH/BN
GN
Yl
GY
PK
BL
RD
BN
•
A HEIDENHAIN standard cable, ref. 242 869, is recommended.
The TNC reacts both to hardware and software handshakes, regardless of the setting in
MP5020.x.
If no transmission stop is set in the MP5020.x, the TNC stops the peripheral unit with the software
handshake.
If transmission stop by both RTS and by DC3 is active, the TNC stops transfer with the hardware
handshake.