3
4.
Operation
4-1
Operation sequence
ZS-6144AF operates as an interface converter that communicates between the
GP-IB controller and the RS-232C interface device.
The RS-232C side is in full duplex communication method and the transfer is
performed regardless of the GP-IB side status as a talker or a listener.
GP-IB
I/F
RS-232Cデータ
受信バッファ
GP-IBデータ
受信バッファ
RS-232C
I/F
GP-IB
トーカ指定時
リスナ指定時
16Kバイト
16Kバイト
RS-232C
Z S - 6 1 4 4 A F
In case of buffer memory is ON.
（
1
）
Talker operation
The data received from the RS-232C is sequentially written the 16 Kbyte buffer
memory. When talker is specified, data in the buffer memory is output to the
GP-IB side.
When the RS-232C data received buffer memory becomes full, the received data
is discarded without being written to the buffer memory.
（
2
）
Listener operation
When the listener is specified, the data received from the GP-IB is written to
the 8 Kbyte buffer memory. If the RS-232C side is receivable state, data in the
buffer memory is output to the RS-232C side. In this case, it is necessary both
CTS and RTS is ON.
GP-IB handshake is stopped when the data reception buffer memory becomes
full. When the amount of data becomes 2 Kbytes or less, the handshake restarts.
In case of buffer memory is OFF
It is used when transmission / reception data always needs latest data from the
other side.
When buffer memory is turned OFF, delimiters separate the continuous data.
If the data received before receiving the delimiter exceeds16 Kbytes, it discards
the data received so far and stores the newly data.
For example, when receiving a delimiter after receiving 18 Kbytes of data, only
the last 2 Kbytes are sent from the sender to the receiver.
If the next new data(B) is sent before sending the received data(A) to the
partner side, the data(A) is discarded and it is rewritten to the data(B)
Note) Delimiter setting is done with the MODE switch. For the setting of the
MODE switch, refer to page 7.
16 Kbyte
Specified as a talker
Specified as a listener
16 Kbyte
RS-232C
data buffer
GP-IB
data buffer
