HDLC
This proven driver is a bit-oriented, synchronous standard protocol for secured data transfer between PCs and data terminals. It supports point-to-point as well as multi-point operations. Two protocol versions are available:
HDLC UNC-2
HDLC UNC-2 works in normal-response-mode (NRM), according to DIN 66221 part 3, with the following characteristics: Half-duplex master-slave operation. In the master operation, up to 30 slaves can be addressed. The station addresses for master and slave can be configured arbitrarily.
Parameters
| Baud Rate | 1.200 Bit/s - 1 MBit/s (clock pulse controlled) 1.200 Bit/s - 38.400 Bit/s (clock pulse retrieval from receive data stream) |
| Modem Operation | on/off (leased line) |
| Modem Watchdog | 1 - 255 ms |
| Operating Mode | master/slave |
| Data Coding | NRZ/NRZI |
| Clock Pulse | external/internal clock pulse |
| Receiving/Sending Clock Pulse | can be selected separately |
| Coding | NRZ/NRZI |
| Clock Pulse Supply | internal baud rate generator, external clock, pulse of remote station or clock pulse, retrieval from receive data stream |
| Frame Size | 128 - 1024 Bytes |
| Window Size | 1 - 7 Frames |
HDLC BAC 2.8
HDLC BAC 2.8 works in the asynchronous balanced mode (ABM) according to DIN 66222. It enables a point-to-point connection between two identical stations in full duplex operation. The protocol version corresponds to LAP-B according to ITU and allows direct access to package switching networks on layer 2. This driver is certified according to NET2.
Parameters
| Data Coding | NRZ/NRZI |
| Baud Rate | up to 1 MBit/s (clock pulse controlled) |
| Clock Pulse Supply | internal baud rate generator or external clock pulse of remote station |
| Frame Size | 64 - 1024 Bytes |
| Window Size | 1 - 7 Frames |
