Extron Electronics PIP 444 User Guide - Manual (Page 38)

Remote Control, cont’d
PIP 422 and PIP 444 Picture-in-Picture Processors • Remote Control 4-2
Remote Control
The PIP’s RS-232/422 port is used to connect to a host or external controlling
device, such as a computer or control system, which can generate the proper
command codes and recognize the processor’s responses.
The cable used to connect the RS-232/RS-422 port to a computer or control
system may need to be modified by removing pins or cutting wires. If
unneeded pins are connected, the processor may hang up. See chapter 2,
“Installation”, for more information on wiring the connectors.
The RS-232/RS-422 connector is a 9-pin D female (figure 4-1). The default protocol
is RS-232, 9600 baud, 8-bit, 1 stop bit, no parity, and no flow control.
See “Selecting the baud rate and RS-232/RS-422 protocol” in chapter 3,
“Operation”, to change the protocol.
RS-232 Function Pin RS-422 Function
1
2
3
4
5
6
7
8
9 —
TX
RX
—
Gnd
—
—
—
—
Not used
Transmit data
Receive data
Not used
Signal ground
Not used
Not used
Not used
Not used —
TX–
RX–
—
Gnd
—
RX+
TX+
—
Not used
Transmit data (–)
Receive data (–)
Not used
Signal ground
Not used
Receive data (+)
Transmit data (+)
Not used
5 1
9 6
RS-232/422
Figure 4-1 — RS-232/RS-422 pinout
Simple Instruction Set Control
Host-to-PIP communications
The PIP 444 and PIP 422 accept SIS™ (Simple Instruction Set™) commands through
the RS-232/RS-422 port. SIS commands consist of one or more characters per
command field. They do not require any special characters to begin or end the
command character sequence. Each response to an SIS command ends with a
carriage return and a line feed (CR/LF = ), which signals the end of the response
character string. A string is one or more characters.
PIP-initiated messages
(C) Copyright 2005, Extron Electronics, PIP 422 (444), V. x.xx
Error responses
When the PIP receives a valid SIS command, it executes the command and sends a
response to the host device. If the processor is unable to execute the command
because the command is invalid or contains invalid parameters, it returns an error
response to the host. The error response codes are:
E01 — Invalid input channel number (too large)
E09 — Invalid function number (too large)
E10 — Invalid command
E11 — Invalid preset
E13 — Invalid value (out of range)
E23 — Checksum error