Measurement Computing Serial488/4 - Manual (Page 56)

Section 3 Command Descriptions
3.17
Port Select Pn
The Port Select command determines which port is selected for execution of
serial setup commands and for data input/output w hen using the Dual Primary
addressing mode. The factory default setting as set by the Save Configuration
command (S0) is P1, port 1 selected.
P1
Port 1 is selected
P2
Port 2 is selected
P3
Port 3 is selected
P4
Port 4 is selected
P?
Return present port selection
Example 1: Select port 1, then send a message using dual primary addressing mode.
PRINT#1,"OUTPUT08;P1X"
select port 1 as the current port
PRINT#1,"OUTPUT08;a0b5c1d1X"
select 1 stop bit, 2400 baud, odd parity
8 data bits
PRINT#1,"OUTPUT08;g1n0t13X"
select Xon/Xoff, automatic
handshaking, terminator CR
PRINT#1,"OUTPUT09;Startup
send a startup message out port 1
message"
Example 2: Select port 1, then send a message using secondary addressing mode.
PRINT#1,"OUTPUT0800;P1X"
select port 1 as the current port
PRINT#1,"OUTPUT0800;a0b5c1d1X"
select 1 stop bit, 2400 baud, odd parity,
8 data bits
PRINT#1,"OUTPUT0800;g1n0t13X"
select Xon/Xoff, automatic
handshaking, terminator CR
PRINT#1,"OUTPUT0801;Startup
send a startup message out port 1
message"