Grass Valley Imagestore 750 v.3.0.1 - Manual (Page 222)

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Installation
Rear Panel and Connections
COM 1–4
There are 4 COM ports, COM 1 through COM 4:
Fig. 12-9: Rear Panel Connectors - Serial Comms ports
They are 8-pin RJ45 ports that provide serial bidirectional communications to external automa-
tion systems, EAS units, a slave device, RCP Classic, or an ST61XX thermometer. The serial port
type can be configured as RS-232 or RS-422. The Baud rate can be set to 1200, 9600, 19200,
38400, 57600 or 115200.
See Emergency Alert System (EAS) on page 35, Temperature Probe on page 38, and Graphics
Co-Processors on page 52for more information.
A serial port can be set to receive Oxtel automation commands or to transmit certain Oxtel auto-
mation commands to a slave device using the “Oxtel Slave” protocol. For EAS, the serial port will
receive “ENDEC 1822” and “TFT EAS 911T” protocols, and for the temperature probe, it will
receive “ST61XX Thermometer” protocol.
 A Baud rate of 1200 is valid only when used with the protocol for the ST61XX thermometer.
When your Imagestore 750 is used for master control, the serial port can also be set to send and
receive Presmaster protocol automation using the “Presmaster Automation” protocol, although
Oxtel automation is a superior and more flexible protocol and should therefore be preferred.
If a Presmaster Control System (PCS) is controlling the Imagestore 750, you should select “Oxtel
Automation” protocol, and it is recommended that a Baud rate of 57,600 and serial type of RS-
422 be used. Note that Presmaster software version 4.6 or higher is required for controlling all
four DSKs.
The pin-out of each COM port is:
Pin Signal Name RS-422 Signal Name RS-232
1 TX+ RTS
2 TX– TXD
3 RX+ CTS
4 n.c. n.c.
5 n.c. n.c.
6 RX– RXD
7 n.c. n.c.
8 GND GND
Table 12-5: Serial Comms Ports connector pinout