X25AM Programming Manual

PTP Applications

X25AM Programming Manual—527201-001

3-52

Wait for the Data Exchange (Use Mode 1)

The program waits for the call with a CONTROL 11. It waits for the data exchange by

reading data for a packet. READ and WRITE can be in any order, depending on the

program logic and the response expected from the remote device. The program ends

the call with a CONTROL 12.

1. OPEN the subdevice.

!Nothing is sent or received.

2. SETMODE 31,1,0.

!Set the data-exchange mode to 1.

3. CONTROL 11.

!Wait for an Incoming Call.

!An Incoming Call is received.

!A Call Accepted is sent.

!CONTROL 11 completes.

!The remote device writes the data for the first packet for

!logical record A. The WRITE COUNT is equal to PACKETSIZE.

!The M bit is set to one.

!The first data packet (M=1) for logical record A is

!received.

4. READ data from a packet.

!The program waits for data from the remote device with a

!READ. The remote device has already sent the first

!packet for logical record A. The data from the data

!packet is transferred to the READ buffer.

!The READ completes successfully.

!The remote device writes the second and last packet for

!logical record A. The data is less than PACKETSIZE.

!The M bit is set to 0.

!The final data packet (M=0) for logical record A is

!received.