HEIDENHAIN TNC 122 Technical Manual - Manual (Page 16)

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TNC 122 8 Pin Layout 15
X21 Data Interface
The TNC 122 is equipped with an RS-232-C/V.24 data interface for operation in FE or EXT mode (see
the User's Manual). Programs and a list of the machine parameters can be output though this
interface. An RS-232-C adapter must be provided for a peripheral unit, such as a PC, FE 401, or
printer, to be connected to the control panel. The following drawing illustrates how to connect the
adapter block to X21.
HEIDENHAIN guarantees that, if properly connected, the RS-232-C/V.24 serial interface will reliably
transmit data between the TNC and a peripheral unit up to a distance of 20 meters.
HEIDENHAIN provides a standard cable 3 meters in length (Id.-Nr. 274 545 01) for connecting
peripheral units.
The data format in FE and EXT mode is fixed at 7 data bits, 2 stop bits and even parity. The FE mode
operates with ACK/NAK handshake, the EXT mode with DC1/DC3 handshake and RTS/CTS. The
data transfer rates are 9600 baud in FE mode and 2400 baud in EXT.
GND Chassis
RXD Receive data
TXD Transmit data
CTS Clear to send
RTS Request to send
DTR Data terminal ready
GND Signal ground
DSR Data set ready
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X21 RS-232-C/V.24
Id.-Nr. 239 760..
max. 17 m
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WH/BN
GND
TXD
RXD
RTS
CTS
DSR
GND
DTR
Id.-Nr. 274 545 01
3 m
V.24-Adapter Block
Id.-Nr. 239 758 01
Peripheral
unit
• •
• • • • •
WH/BN WH/BN WH/BN
The interface complies with the recommendations in EN 50 178 for separation from line
power.