Bytes 4–10 is the low control limit.
Bytes 14–20 is the high control limit.
Example:
C2; 1.0000<X<85.0000 <CR><LF>
Return and Clear Error
Short format (3 bytes):
1 2 3
E ? X
This command sets the output to transmit the
error code and description, transmits the data,
then clears the error. The format is valid for 1
output only then returns to the standard output
format.
Returns a variable length string:
Byte 1 is ‘E’.
Bytes 2–4 is the decimal value of the error.
Bytes 7 to end of string is an error message, a
carriage return and a linefeed.
RS-232 SERIAL COMMUNICATION
This section of the manual applies to the serial
communication capability. Refer to the GPIB por-
tion at the beginning of this section of the manual
for additional information relating to commands
and responses.
The serial communication port allows the
PCS 400
to communicate with computers, terminals and
modems (referred to as the host) in RS-232 inter-
face format. A single host can communicate with
multiple
PCS 400
‘s using a special daisy chain cable
system (see figure 4.2). Communicating over the
serial port does NOT disable the front panel key-
pad. However, in order to avoid conflicts, front
panel entry of commands should be avoided while
operating over the bus.
Cable Requirements
RS-232 communications are transmitted over a
three conductor, shielded cable terminated in a
standard DB9S connector on the
PCS
end, and
usually a DB9 connector on the host end. Figure
4.1 illustrates the proper pin connections for a host
to single
PCS
hook-up. Figure 4.2 shows the daisy
chain cabling required for host to multiple
PCS
arrangement. Up to ten
PCS
‘s can be supported by
a single host using the daisy chain cabling.
Setup
Before putting the RS-232 interface into operation
the various communication parameters must be
selected from the SERIAL setup menu. Refer to the
menu tree provided with this manual. The parame-
ters selected must match the host and any other
devices on the same cable loop. Commands must
be sent in ASCII format and terminated with the
selected termination character. Commands are not
case sensitive, and both upper and lower case
characters are accepted. Each command returns a
response after processing. With ‘ECHO ON’ the
PCS
400
will return the command first, followed by the
response. The host must not send another com-
mand until the previous response is received.
Parameters
Instrument address:
Enter a unique address for
each
PCS 400
on the cable. Valid entries are 0-9.
Baud rate:
Select the baud rate which matches
that of the host. Available
PCS 400
baud rates are
300, 1200, 2400, 4800, 9600, and 19200.
Data format:
Select the proper data format from
the following table:
Table 4.4 – Data Bits Format
Data-Bits
Stop-Bits
Parity
7
1
none
7
1
even
7
2
none
7
2
even
8
1
none
8
1
even
8
2
none
8
2
even
Termination character:
Sets up the last character
sent by the host. Selections are:
<lf> linefeed, ASCII 10
<cr> carriage return, ASCII 13
Single/Multi-drop:
Selects single or multiple
PCS
400
‘
s
, and the echo mode. The choices are:
Single drop, echo off: for one
PCS
, no echo.
Uses XON/XOFF protocol.
Single drop, echo on: for one
PCS
with echo.
Uses XON/XOFF protocol.
Multi-drop: for 2 to 10
PCS
‘s. Requires special
addressing preamble. Does not use
XON/XOFF protocol.
REMOTE OPERATION
PCS 400
4-16
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Summary of Contents for PCS 400
Page 13: ...User s Notes TABLE OF CONTENTS PCS 400 xii www mensor com ...
Page 23: ...User s Notes INSTALLATION PCS 400 2 4 www mensor com ...
Page 41: ...User s Notes LOCAL OPERATION PCS 400 3 18 www mensor com ...
Page 73: ...User s Notes SPECIFICATIONS PCS 400 7 4 www mensor com ...
Page 115: ...User s Notes INDEX PCS 400 10 6 www mensor com ...
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