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Introduction
MPS450 features include a built-in RS-232 serial port running at 9600 baud—configured
so that it can be connected to a standard PC serial port with a straight-through cable—
that enables instrument control through remote commands. (See the "Entering Remote
Commands" section later in this chapter.)
Remote Connection
The serial-port connector is a 9-pin female D-SUB, configured as Data Communications
Equipment (DCE) and intended to connect straight through to Data Terminal Equipment
(DTE). Table 4-1 lists the pins of the remote connector and their signal name and
function:
Pin
Signal Name
1
(not used)
2
RX
3
TX
4
(not used)
5
Ground
6
DSR
7
RTS
8
CTS
9
(not used)
For serial communications to work properly, the RTS handshake line must be connected
and functioning. Normally, when connecting to a PC serial port, that requirement is met.
The PC serial port may need to be configured in order to turn on RTS/CTS handshaking.
Entering Remote Commands
In addition to using the MPS450 keypad (in either the menu-control or numeric-control
mode), the instrument can be controlled by sending remote commands to its serial port.
For example, the following remote-entry command sets blood-pressure sensitivity to 40
*V/V/mmHg:
BPSNS40
A complete list of the remote-entry commands, which set up MPS450 parameters and
return standard operational responses, is arranged by category is in the "Codes and
Actions" section later in this chapter.
The following guidelines apply to entering remote commands:
Table 4-1. Remote Connector Signal Pin-Out
Direction DCE
Output
Data received by DTE (transmitted by
MPS450/DCE)
Input
Data transmitted by DTE (received by
MPS450/DCE)
Signal common
Output
Handshake line indicates MPS450/DCE ready,
always ON
Input
Handshake line from DTE says MPS450/DCE
can send data
Hand Handshake line tells DTE it is OK to send
Output
data to MPS450/DCE
Remote Operations
Function
4
Introduction
4-3
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