Hp-Il Implementation On The 7470 - HP 7470A Interfacing And Programming Manual

For more detailed information on HP—IL and how your computer sends
commands and data through the interface, refer to your HP-IL and
computer documentation. Typically, BASIC statements are used to
send interface commands and messages.
HP-IL Implementation on the 7470
The HP—ILcapability subsets for the 7470 are listed in the following
table.
Function Description Implementation
R Receiver. Complete capability.
AH Acceptor handshake. Complete capability.
SH1 Source handshake. Complete capability.
D Driver. Complete capability.
L1 Listener. Basic listener.
L3 Listener. Unaddress if addressed
to talk (MTA).
LEO Extended listener. No capability.
T1 Talker. Basic talker; send data.
T2 Talker. Send status. (Returns a
byte containing the
status that is sent with
the HP-GL output
status command, OS.
Does not reset bit
number 3, the initialize
flag, in the status byte.)
T3 Talker. Send device ID.
(Returns the string
"HP747OA" followed
by a carriage return
and a line feed.)
T4 Talker. Send accessory ID.
(Returns a byte with
the following bit
pattern: 0110 0000 or
60 hex.)
T6 Talker. Unaddress if addressed
to listen (MLA).
11-2 HP-IL INTERFACING