Citizen iDP-3550 User Manual page 63

ESC BEL n1 n2
[Function] Setting the external device drive pulse width
[Code] <1B>H <07>H n1 n2
[Range] 1 n1 127
[Outline] This command sets the power-on time to drive an external device (such as cash drawer).
Power-on time = n1 10 (ms)
Delay time = n2 10 (ms)
To actually drive the drawer, use the BEL and FS commands.
[Default] n1 = n2 = 20
BEL
[Function] Driving command A for drawer-1
[Code] <07>H
[Outline] This command drives the drawer connector No. 2 pin under the condition set with the ESC
BEL n1 n2 command. This command is executed in order of entry into the input buffer.
1 n2 127