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3--4
General RS-232C/RS-422/RS-485 Specifications
3--5
Communications and Error Control
3--5--1
Communications Control Procedures
Host
E5AF/E5EF
Transmission line connection:
Communications system:
Synchronization system:
Communications speed:
Communications code:
Error detection:
Interface:
Definition of Terminal: DTE (Data Terminal Equipment)
D0
D1
Start
bit
The E5AF RS-232C is defined as DTE (Data Terminal Equipment). This
means that a carrier detect (CD) signal for the host computer is not sup-
ported. If a CD signal is needed, it must be provided (via the +12 V terminal)
on the host computer side.
The communications specifications of the E5AF are the same as those of the
E5AX, except for the commands that are used for the fuzzy function of the
E5AF.
The communications protocol for the E5AF/E5EF is a special conversational
type. The first right to send belongs to the host computer, and the right is
transferred with each block sent. Whenever a command block is sent, a re-
sponse block is sent in return.
@
Controller no.
Header code
Text
FCS
Terminator
Command block
@
Controller no.
Header code
Text
FCS
Terminator
Response block
Multiple point
RS-232C/RS-422 (4-wire, half-duplex),
RS-485 (2-wire, half-duplex)
Start-stop synchronization (2 stop bits)
150/300/600/1200/2400/4800/9600 bps
ASCII (7 bits)
Vertical parity (even) and FCS (frame check
sequence)
RS-232C/RS-422/RS-485
D2
D3
D4
D5
D6
@
Controller no.
Header code
Text
FCS
Terminator
Command block
Controller no.
Header code
Terminator
Response block
Section 3--5
Parity
2 stop
bit
bits
@
Text
FCS
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