43
4.5
RS-232C XON/XOFF Handshaking Protocol
The 2835-C uses the XON/XOFF handshaking protocol.When the 2835-C’s RS-232
input buffer is nearly full the 2835-C will send an XOFF (ASCII encoded 19
decimal) character to the remote computer. The XOFF character informs the
remote computer that it needs to suspend transmission until it receives the
XON character from the 2835-C. When the buffer empties sufficiently the 2835-C
will send an XON (ASCII encoded 17 decimal) to signal the remote computer
that it can resume transmission.
The 2835-C will also respond to XOFF and XON characters sent to it from the
remote computer. When the 2835-C receives an XOFF character it will sus-
pend all transmission of characters to the remote computer until the XON
character is received.
4.6
GPIB Communication
A variety of third party GPIB communication hardware and software, such as
plug-in GPIB computer boards and Lab View software from National Instru-
ments exists. The 2835-C should work with any of these as long as they
adhere to the IEEE 488.1 standard. This manual assumes the user is familiar
with one of these third party hardware/software packages. The table below
summarizes the IEEE 488.1 capabilities supported by the 2835-C.
Table 24 – Model 2835-C IEEE 488.1 Capabilities Summary
Description
Command
Level of Capability
Source Handshake
SH1
complete capability
Acceptor Handshake
AH1
complete capability
Talker
T6
basic talker, serial poll, unaddress if MLA
Extended Talker
TE0
no capability
Listener
L4
basic listener, unaddress if MTA
Extended Listener
LE0
no capability
Service Request
SR1
complete capability
Remote Local
RL0
*no capability
Parallel Poll
PP1
remote configuration
Device Clear
DC1
complete capability
Device Trigger
DT0
no capability
Controller
C0
no capability
NOTE
* In order to better handle the RS-232C interface the 2835-C automatically
goes into remote mode when a command is received from either of the
remote computer interfaces. The LLO command is used to enable or disable
the local lockout state.
4.6.1
Setting The GPIB Address
Before communicating with the 2835-C GPIB port the 2835-C GPIB address
must be set. The address can bebetween 0 and 30. The address can only be
set from the keypad and is accessed through the menu structure. To set the
GPIB address select the REMOTE SETUP->GPIB ADDRESS option in the menu.
The Model 2835-C GPIB is factory set to 5. (See Section 2.4.13)
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