7-1
SECTION 7
VISCA COMMAND LIST
PCS-C150/C150P
7-1. VISCA Summary
PCS-C150/C150P uses a protocol called VISCA. In VISCA, the computer or other device issuing the commands is called the controller and
the PCS-C150/C150P or other device receiving those commands is called the peripheral device. Under VISCA, up to 7 VISCA Equipments
can be connected to one controller using RS-232C communications. The RS-232C parameters are communications speed of 9600 baud,
data length of 8 bits, 1 stop bit, 1 start bit, and no parity. Flow control, such as XON/XOFF and RTS/CTS, is not used. The VISCA
Equipments are connected in a daisy chain. The actual internal connections form a one-way ring, as shown in the figure below, so messages
pass through all the devices and return to the controller. Each device has an address on this network. The address of the controller is always
0. The addresses of the devices are numbered 1, 2, 3, etc., in order from closer to the controller to farther away. As part of the initialization
operations, the controller sends the address command to set the addresses for the VISCA Equipments.
Fig. 7-1. VISCA Network
PCS-C150/C150P has a VISCA IN port and a VISCA OUT port. As viewed from the outside, both the VISCA IN and VISCA OUT ports
have the connector pin layout shown in Fig. 7-2. During control by a computer, set the PCS-C150/C150P DTR input ( the computer’s
S output ) high.
Fig. 7-2. VISCA Connector
