Communications Protocols |
INTERFACE | |
LAN | GP-IB |
LAN Overview |
LANs were originally developed as a practical way for computers to communicate with one another,
but has since become popular for communications between various devices.
LAN is an abbreviation for Local Area Network, as it defines a network intended to cover a relatively small area,
such as within a building or site, generally utilizing the Ethernet protocol.
Models 8860 and 8861 support 100BASE-TX Ethernet, and communicate using TCP/IP protocols.
Cables may be up to 100 meters long,
and can be connected to a system using a hub,
or directly to a 100BASE-TX connector on a computer using a crossover cable.
The upper three decimal digits of the TCP/IP port number can be specified,
while the rightmost digit is set internally by the HiCORDER.
For example, entering 880X results in a TCP/IP port number of 8802.
The connection times out after one hour.
If no communications occur for more than 1 hour, the communication link will be disconnected.
If one computer attempts to connect to a HIOKI MEMORY HiCORDER while another computer is already connected,
the connected computer is disconnected and the attempting computer becomes connected instead.
Communications Specifications |
Data link | Ethernet 100BASE-TX |
Transfer speed | 100 Mbps |
I/O port | 100BASE-TX |
Protocol | TCP/IP |
Delimiter | CR, LF, CR+LF |
Connection time-out | 1 hour |
GP-IB Outline |
The GP-IB (General Purpose Interface Bus) was developed as a method for making general-purpose connections to programmable devices,
and includes a variety of features and capabilities for expansion.
The GP-IB is also called the IEEE-488 bus, IEC bus, and HP-IB, an HP company standard.
Although basically the same standard, the connector pin numbering and signal arrangements can differ slightly,
so careful attention is necessary.
Refer to the following documents for details of the GP-IB:
GP-IB Specification |
Standard
Communication mode | 8-bit parallel 3-wire handshake method |
Transfer rate | 50kbyte/sec |
Delimiter | LF |
Function | Implementation |
SH1 | SH (Source Handshake) - All Functions |
AH1 | AH (Acceptor Handshake) - All Functions |
T5 |
Basic Talk Function, Serial Poll Function, Talk Only Function MLA (My Listen Address) Talk Release Function |
L4 |
Basic Listener Function MTA (My Talk Address) Listen Release Function |
SR1 | SR (Service Request) - All Functions |
RL1 | RL (Remote/Local) - All Functions |
PP0 | PP (Parallel Poll) - No Function |
DC1 | DC (Device Clear) - All Functions |
DT0 | DT (Device Trigger) - No Function |
C0 | C (Control) - No Function |
Bus Signal Lines | Remarks | ||
Data bus |
DIO 1 (Data Input Output 1) | Apart from input and output of data, these are used for input and output of interface messages and device messages. | |
DIO 2 (Data Input Output 2) | |||
DIO 3 (Data Input Output 3) | |||
DIO 4 (Data Input Output 4) | |||
DIO 5 (Data Input Output 5) | |||
DIO 6 (Data Input Output 6) | |||
DIO 7 (Data Input Output 7) | |||
DIO 8 (Data Input Output 8) | |||
Transfer bus |
DAV (Data Valid) | Signal which indicates data bus information validity. | These perform acceptor and source handshake. |
NRFD (Not Ready For Data) | Input preparation completed signal. | ||
NDAC (Not Data Accepted) | Input completed signal. | ||
Control bus |
ATN (Attention) | Signal which indicates that the information on the data bus is an interface message or a device message. | |
IFC (Interface Clear) | Signal which sets the interface bus system to the initial condition. | ||
SRQ (Service Request) | Signal which requests a non-synchronous service. | ||
REN (Remote Enable) | Signal which performs changeover of remote and local control. | ||
EOI (End or Identify) | Indicates the last byte of data. |
Pin number | Name of signal line | Pin number | Name of signal line |
1 | DIO1 | 13 | DIO5 |
2 | DIO2 | 14 | DIO6 |
3 | DIO3 | 15 | DIO7 |
4 | DIO4 | 16 | DIO8 |
5 | EOI | 17 | REN |
6 | DAV | 18 | GND |
7 | NRFD | 19 | GND |
8 | NDAC | 20 | GND |
9 | IFC | 21 | GND |
10 | SRQ | 22 | GND |
11 | ATN | 23 | GND |
12 | SHIELD | 24 | LOGIC GND |