Tf830 Address And Baud Rate Selection; Arc Protocol - TTI TF830-RS232 Manual De Instrucciones

Using a simple cable assembly, a 'daisy chain' connection system
between any number of instruments, up to the maximum of 32 can be
made, as shown below:
The daisy chain consists of the transmit data (TXD), receive date
(RXD) and signal ground lines only. There are no control/handshake
lines. This makes XON/XOFF protocol essential and allows the inter-
connection between instruments to contain just 3 wires. The wiring of
the adaptor cable is shown below:
Addressable RS232 Chain (ARC) Wiring Scheme
All instruments on the interface must be set to the same baud rate and
all must be powered on, otherwise instruments further down the daisy
chain will not receive any data or commands.
2
The ARC standard for the other interface parameters is as follows, and
in most instruments they are fixed.
Start bits 1
Data bits 8
Parity None
Stop bits 1

TF830 ADDRESS AND BAUD RATE SELECTION

Each instrument connected to the ARC bus must be assigned a unique
address and all must be set to the same baud rate. For the TF830 the
address and baud rate are selected by the set of 8 dip switches on the
rear panel. The switch functions are as shown below:

ARC PROTOCOL

Protocol Specification
Because of the need for XON/XOFF handshake it is possible to send
ASCII coded data only; binary blocks are not allowed. Bit 7 of ASCII
codes is ignored, i.e. assumed to be low. No distinction is made between
upper and lower case characters in command mnemonics and they may
be freely mixed. The ASCII codes below 20H (space) are reserved for
interface control.
Interface Control Codes
All instruments intended for use on the ARC bus use the following set of
interface control codes. Codes between 00H and 1FH which are not
listed here as having a particular meaning are reserved for future use
and will be ignored. Mixing interface control codes inside instrument