User Manual

Quatech QTM-8524 Manual 37

4.4.1 Mode 1: Full Duplex, Synchronous

Mode 1 is the most common form of peer-to-peer communication. In this mode, a

module first encodes the input data streams. Then, it transmits the data to the

downstream QTM-8524 module. The receiving module decodes the data stream

and drives the data onto the serial communication lines.

In Mode 1, the QTM-8524 modules are configured for full duplex mode and syn-

chronous communication. As mentioned in the previous section, both modules

must be configured for the same baud rate, frequency and channel. Note also that

the data must be transmitted using the predefined synchronous data format (see

section 4.3).

Jumper Configuration:

1. Select Channel from C0 - C7 (Jumper 1)

2. Select Frequency from 2426.112 - 2458.26 MHz (Jumper 2)

3. Select Baud Rate from 600 bps to 19200 bps (Jumper 3)

4. Select Full Duplex Mode (Jumper 4)

5. Select Master or Slave (Jumper 5)

6. Select Synchronous Communication (Jumper 6)

7. Select RS-232 or RS-485 (Jumper 7)

(See Figure 2.4 for a diagram of QTM-8524 jumper settings.)

Advantages:

1. Decreases communication error rate

2. Increases communication stability

3. Can be used with QTM-8000 Series I/O modules

Limitations:

1. Fixed data format

2. Peer-to-peer communication

3. Maximum baudrate: 19200 bps

Note: When QTM-8524 modules are used in Mode 1

with QTM-8000 Series I/O modules, the upstream QTM-

8524 connected to the PC should be configured for RS-

232 communication and set to Master mode, the down-

stream QTM-8524 should be configured for RS-485 com-

munication and set to Slave mode.