AMETEK XEL Series 60V and below - Manual (Page 28)

Remote/Local Operation
At power-on the instrument will be in the local state with the REMOTE indicator off. In this state
all front panel operations are possible. When the instrument is addressed to listen and a
command is received the remote state will be entered and REMOTE will be turned on. In this
state the front panel is locked out and remote commands only will be processed. The V/I settings,
Meter Average setting, Current Range and output state(s) are unchanged but LOCK and V-Span
are cancelled if they were on. The Vmin and Vmax values are retained. The MODE (XDL-P
models only) and Sense settings remain as set by the front panel switches. The instrument may
be returned to the local state by pressing the LOCAL key; however, the effect of this action will
only remain until the instrument is addressed again or receives another character from the
interface, when the remote state will once again be entered. Returning to Local by this action, or
by the use of the LOCAL command, will keep the V/I settings at their last remotely set values,
with Lock Settings on, and will leave the output(s) in their present state.
RS232 Interface
RS232 Interface Connector
The 9-way D-type serial interface connector is located on the instrument rear panel. The pin
connections are as shown below:
Pin Name Description
1 RI Passively asserted (+V through 10k Ω)
2 TXD Transmitted data from instrument
3 RXD Received data to instrument
4 CTS
5 GND Signal ground
6 RTS Passively asserted (+V through 10k Ω)
7 DSR No internal connection
8 DTR
9 CD No internal connection
RS232 Connections
The RS232 interface should be connected to a standard PC port using a fully wired 1:1 male-
female cable without any cross-over connections. Alternatively, only pins 2, 3 and 5 need be
connected to the PC, but with links made in the connector at the PC end between pins 1, 4 and 6
and between pins 7 and 8, see diagram.
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