Yokogawa 414 Batch Controller - Manual (Page 27)

4. OPTIONS
4.1 THE RS232/422/485 INTERFACE OPTION
With this option installed, the circuits for both the RS232 and RS422/485 are
provided as standard. They can be used to interface to both printers and
computers and a number of standard protocols are built into the instrument.
4.1.1 Hardware
The following diagram provides an overview of the RS232/RS422/485
communications hardware. All three interfaces are available on the rear terminal
strips and the user can select either one by making the appropriate connections.
The RS232 interface is primarily used with printers or for simple communication
with a computer over a short distance. The RS422 and RS485 interfaces are
used for communication over a long distance or in applications requiring
multipoint communication.
24
23
26
25
21
22
20
( + )
(-)
( + )
(-)
RS422 Out
RS422 In
Data In
Data Out
Ground
RS232
27 CTS
Options 25